diff --git a/src/Humanizer/Localisation/Formatters/RussianFormatter.cs b/src/Humanizer/Localisation/Formatters/RussianFormatter.cs
index 4387ce457..e6ea06fe3 100644
--- a/src/Humanizer/Localisation/Formatters/RussianFormatter.cs
+++ b/src/Humanizer/Localisation/Formatters/RussianFormatter.cs
@@ -10,7 +10,7 @@ protected override string GetResourceKey(string resourceKey, int number)
             return resourceKey + suffix;
         }
 
-        private string GetSuffix(RussianGrammaticalNumber grammaticalNumber)
+        private static string GetSuffix(RussianGrammaticalNumber grammaticalNumber)
         {
             if (grammaticalNumber == RussianGrammaticalNumber.Singular)
             {
diff --git a/src/Humanizer/Localisation/Formatters/UkrainianFormatter.cs b/src/Humanizer/Localisation/Formatters/UkrainianFormatter.cs
index d426ff81b..43e37beeb 100644
--- a/src/Humanizer/Localisation/Formatters/UkrainianFormatter.cs
+++ b/src/Humanizer/Localisation/Formatters/UkrainianFormatter.cs
@@ -9,7 +9,7 @@ protected override string GetResourceKey(string resourceKey, int number)
             return resourceKey + suffix;
         }
 
-        private string GetSuffix(RussianGrammaticalNumber grammaticalNumber)
+        private static string GetSuffix(RussianGrammaticalNumber grammaticalNumber)
         {
             if (grammaticalNumber == RussianGrammaticalNumber.Singular)
             {
diff --git a/src/Humanizer/Localisation/NumberToWords/BulgarianNumberToWordsConverter.cs b/src/Humanizer/Localisation/NumberToWords/BulgarianNumberToWordsConverter.cs
index 91672cdc0..76f7aceaf 100644
--- a/src/Humanizer/Localisation/NumberToWords/BulgarianNumberToWordsConverter.cs
+++ b/src/Humanizer/Localisation/NumberToWords/BulgarianNumberToWordsConverter.cs
@@ -37,7 +37,7 @@ internal class BulgarianNumberToWordsConverter : GenderedNumberToWordsConverter
         public override string Convert(long input, GrammaticalGender gender, bool addAnd = true) =>
             Convert(input, gender, false);
 
-        private string Convert(long input, GrammaticalGender gender, bool isOrdinal, bool addAnd = true)
+        private static string Convert(long input, GrammaticalGender gender, bool isOrdinal, bool addAnd = true)
         {
             if (input is > int.MaxValue or < int.MinValue)
             {
diff --git a/src/Humanizer/Localisation/NumberToWords/CentralKurdishNumberToWordsConverter.cs b/src/Humanizer/Localisation/NumberToWords/CentralKurdishNumberToWordsConverter.cs
index fbbfe9e20..df4adb350 100644
--- a/src/Humanizer/Localisation/NumberToWords/CentralKurdishNumberToWordsConverter.cs
+++ b/src/Humanizer/Localisation/NumberToWords/CentralKurdishNumberToWordsConverter.cs
@@ -68,7 +68,7 @@ public override string ConvertToOrdinal(int number)
             return $"{word}{(IsVowel(word[word.Length - 1]) ? "یەم" : "ەم")}";
         }
 
-        private bool IsVowel(char c) =>
+        private static bool IsVowel(char c) =>
             c is 'ا' or 'ێ' or 'ۆ' or 'ە' or 'ی';
     }
 }
diff --git a/src/Humanizer/Localisation/NumberToWords/ChineseNumberToWordsConverter.cs b/src/Humanizer/Localisation/NumberToWords/ChineseNumberToWordsConverter.cs
index d445dd4b0..63bab29cc 100644
--- a/src/Humanizer/Localisation/NumberToWords/ChineseNumberToWordsConverter.cs
+++ b/src/Humanizer/Localisation/NumberToWords/ChineseNumberToWordsConverter.cs
@@ -10,9 +10,9 @@ public override string Convert(long number) =>
         public override string ConvertToOrdinal(int number) =>
             Convert(number, true, IsSpecial(number));
 
-        private bool IsSpecial(long number) => number > 10 && number < 20;
+        private static bool IsSpecial(long number) => number > 10 && number < 20;
 
-        private string Convert(long number, bool isOrdinal, bool isSpecial)
+        private static string Convert(long number, bool isOrdinal, bool isSpecial)
         {
             if (number == 0)
             {
diff --git a/src/Humanizer/Localisation/NumberToWords/CzechNumberToWordsConverter.cs b/src/Humanizer/Localisation/NumberToWords/CzechNumberToWordsConverter.cs
index 4c5b83e13..b0d464f0b 100644
--- a/src/Humanizer/Localisation/NumberToWords/CzechNumberToWordsConverter.cs
+++ b/src/Humanizer/Localisation/NumberToWords/CzechNumberToWordsConverter.cs
@@ -45,7 +45,7 @@ public override string Convert(long number, GrammaticalGender gender, bool addAn
         public override string ConvertToOrdinal(int number, GrammaticalGender gender) =>
             number.ToString(_culture);
 
-        private string UnitByGender(long number, GrammaticalGender? gender)
+        private static string UnitByGender(long number, GrammaticalGender? gender)
         {
             if (number != 1 && number != 2)
             {
@@ -62,7 +62,7 @@ private string UnitByGender(long number, GrammaticalGender? gender)
             };
         }
 
-        private void CollectLessThanThousand(List<string> parts, long number, GrammaticalGender? gender)
+        private static void CollectLessThanThousand(List<string> parts, long number, GrammaticalGender? gender)
         {
             if (number >= 100)
             {
diff --git a/src/Humanizer/Localisation/NumberToWords/FinnishNumberToWordsConverter.cs b/src/Humanizer/Localisation/NumberToWords/FinnishNumberToWordsConverter.cs
index 396bef2cc..c85e1e218 100644
--- a/src/Humanizer/Localisation/NumberToWords/FinnishNumberToWordsConverter.cs
+++ b/src/Humanizer/Localisation/NumberToWords/FinnishNumberToWordsConverter.cs
@@ -85,7 +85,7 @@ public override string Convert(long input)
             return string.Join("", parts).Trim();
         }
 
-        private string GetOrdinalUnit(int number, bool useExceptions)
+        private static string GetOrdinalUnit(int number, bool useExceptions)
         {
             if (useExceptions && OrdinalExceptions.ContainsKey(number))
             {
@@ -95,7 +95,7 @@ private string GetOrdinalUnit(int number, bool useExceptions)
             return OrdinalUnitsMap[number];
         }
 
-        private string ToOrdinal(int number, bool useExceptions)
+        private static string ToOrdinal(int number, bool useExceptions)
         {
             if (number == 0)
             {
diff --git a/src/Humanizer/Localisation/NumberToWords/GermanNumberToWordsConverterBase.cs b/src/Humanizer/Localisation/NumberToWords/GermanNumberToWordsConverterBase.cs
index 925d20fe8..637aca997 100644
--- a/src/Humanizer/Localisation/NumberToWords/GermanNumberToWordsConverterBase.cs
+++ b/src/Humanizer/Localisation/NumberToWords/GermanNumberToWordsConverterBase.cs
@@ -131,10 +131,10 @@ private string Part(string pluralFormat, string singular, long number)
             return string.Format(pluralFormat, Convert(number));
         }
 
-        private int NoRestIndex(int number) =>
+        private static int NoRestIndex(int number) =>
             number == 0 ? 0 : 1;
 
-        private string GetEndingForGender(GrammaticalGender gender)
+        private static string GetEndingForGender(GrammaticalGender gender)
         {
             switch (gender)
             {
diff --git a/src/Humanizer/Localisation/NumberToWords/GreekNumberToWordsConverter.cs b/src/Humanizer/Localisation/NumberToWords/GreekNumberToWordsConverter.cs
index 42d8ea5f7..8972945c8 100644
--- a/src/Humanizer/Localisation/NumberToWords/GreekNumberToWordsConverter.cs
+++ b/src/Humanizer/Localisation/NumberToWords/GreekNumberToWordsConverter.cs
@@ -76,14 +76,17 @@ public override string ConvertToOrdinal(int number)
             return string.Empty;
         }
 
-        private string GetOneDigitOrdinal(int number)
+        private static string GetOneDigitOrdinal(int number)
         {
-            if (!ΟrdinalMap.TryGetValue(number, out var output)) return string.Empty;
+            if (ΟrdinalMap.TryGetValue(number, out var output))
+            {
+                return output;
+            }
 
-            return output;
+            return string.Empty;
         }
 
-        private string GetTwoDigitOrdinal(int number)
+        private static string GetTwoDigitOrdinal(int number)
         {
             if (number == 11) return "ενδέκατος";
             if (number == 12) return "δωδέκατος";
@@ -100,26 +103,26 @@ private string GetTwoDigitOrdinal(int number)
             return decadesString;
         }
 
-        private string GetThreeDigitOrdinal(int number)
+        private static string GetThreeDigitOrdinal(int number)
         {
-            var hundrends = number / 100;
+            var hundreds = number / 100;
 
-            if (!ΟrdinalMap.TryGetValue(hundrends*100, out var hundrentsString)) return string.Empty;
+            if (!ΟrdinalMap.TryGetValue(hundreds*100, out var hundredsString)) return string.Empty;
 
-            if (number - hundrends*100> 10)
+            if (number - hundreds*100> 10)
             {
-                return hundrentsString + " " + GetTwoDigitOrdinal(number - hundrends*100);
+                return hundredsString + " " + GetTwoDigitOrdinal(number - hundreds*100);
             }
 
-            if(number - hundrends * 100 > 0)
+            if(number - hundreds * 100 > 0)
             {
-                return hundrentsString + " " + GetOneDigitOrdinal(number - hundrends*100);
+                return hundredsString + " " + GetOneDigitOrdinal(number - hundreds*100);
             }
 
-            return hundrentsString;
+            return hundredsString;
         }
 
-        private string GetFourDigitOrdinal(int number)
+        private static string GetFourDigitOrdinal(int number)
         {
             var thousands = number / 1000;
 
diff --git a/src/Humanizer/Localisation/NumberToWords/IndianNumberToWordsConverter.cs b/src/Humanizer/Localisation/NumberToWords/IndianNumberToWordsConverter.cs
index 04b4845ee..f70940f0b 100644
--- a/src/Humanizer/Localisation/NumberToWords/IndianNumberToWordsConverter.cs
+++ b/src/Humanizer/Localisation/NumberToWords/IndianNumberToWordsConverter.cs
@@ -29,7 +29,7 @@ public override string ConvertToOrdinal(int number)
             return result;
         }
 
-         public string NumberToText( long number)
+         public static string NumberToText( long number)
          {
              if (number < 0)
                  return "(Negative) " + NumberToText(-number);
diff --git a/src/Humanizer/Localisation/NumberToWords/JapaneseNumberToWordsConverter.cs b/src/Humanizer/Localisation/NumberToWords/JapaneseNumberToWordsConverter.cs
index 4fde91bda..1f5f91f5d 100644
--- a/src/Humanizer/Localisation/NumberToWords/JapaneseNumberToWordsConverter.cs
+++ b/src/Humanizer/Localisation/NumberToWords/JapaneseNumberToWordsConverter.cs
@@ -13,7 +13,7 @@ public override string Convert(long number) =>
         public override string ConvertToOrdinal(int number) =>
             ConvertImpl(number, true);
 
-        private string ConvertImpl(long number, bool isOrdinal)
+        private static string ConvertImpl(long number, bool isOrdinal)
         {
             if (number == 0)
             {
diff --git a/src/Humanizer/Localisation/NumberToWords/KoreanNumberToWordsConverter.cs b/src/Humanizer/Localisation/NumberToWords/KoreanNumberToWordsConverter.cs
index ef9faffa6..60ed278e4 100644
--- a/src/Humanizer/Localisation/NumberToWords/KoreanNumberToWordsConverter.cs
+++ b/src/Humanizer/Localisation/NumberToWords/KoreanNumberToWordsConverter.cs
@@ -36,7 +36,7 @@ public override string Convert(long number) =>
         public override string ConvertToOrdinal(int number) =>
             ConvertImpl(number, true);
 
-        private string ConvertImpl(long number, bool isOrdinal)
+        private static string ConvertImpl(long number, bool isOrdinal)
         {
             if (isOrdinal && number < 20)
             {
diff --git a/src/Humanizer/Localisation/NumberToWords/Romanian/RomanianCardinalNumberConverter.cs b/src/Humanizer/Localisation/NumberToWords/Romanian/RomanianCardinalNumberConverter.cs
index 10f8c100b..b1cc186d5 100644
--- a/src/Humanizer/Localisation/NumberToWords/Romanian/RomanianCardinalNumberConverter.cs
+++ b/src/Humanizer/Localisation/NumberToWords/Romanian/RomanianCardinalNumberConverter.cs
@@ -134,7 +134,7 @@ public string Convert(int number, GrammaticalGender gender)
         /// </summary>
         /// <param name="number">The number to split.</param>
         /// <returns>The sequence of three-digit numbers.</returns>
-        private List<int> SplitEveryThreeDigits(int number)
+        private static List<int> SplitEveryThreeDigits(int number)
         {
             var parts = new List<int>();
             var rest = number;
@@ -223,17 +223,17 @@ private string ThreeDigitSetConverter(int number, GrammaticalGender gender, bool
             if (tensAndUnits <= 9)
             {
                 // simple case for units, under 10
-                words += " " + getPartByGender(_units[tensAndUnits], gender);
+                words += " " + GetPartByGender(_units[tensAndUnits], gender);
             }
             else if (tensAndUnits <= 19)
             {
                 // special case for 'teens', from 10 to 19
-                words += " " + getPartByGender(_teensUnder20NumberToText[tensAndUnits - 10], gender);
+                words += " " + GetPartByGender(_teensUnder20NumberToText[tensAndUnits - 10], gender);
             }
             else
             {
                 // exception for zero
-                var unitsText = (units == 0 ? string.Empty : " " + (_joinGroups + " " + getPartByGender(_units[units], gender)));
+                var unitsText = (units == 0 ? string.Empty : " " + (_joinGroups + " " + GetPartByGender(_units[units], gender)));
 
                 words += unitsText;
             }
@@ -241,7 +241,7 @@ private string ThreeDigitSetConverter(int number, GrammaticalGender gender, bool
             return words;
         }
 
-        private string getPartByGender(string multiGenderPart, GrammaticalGender gender)
+        private static string GetPartByGender(string multiGenderPart, GrammaticalGender gender)
         {
             if (multiGenderPart.Contains("|"))
             {
@@ -266,8 +266,8 @@ private string getPartByGender(string multiGenderPart, GrammaticalGender gender)
             }
         }
 
-        private bool IsAbove20(int number) =>
-            (number >= 20);
+        private static bool IsAbove20(int number) =>
+            number >= 20;
 
         private string HundredsToText(int hundreds)
         {
@@ -281,7 +281,7 @@ private string HundredsToText(int hundreds)
             }
             else
             {
-                return getPartByGender(_units[hundreds], GrammaticalGender.Feminine) + " sute";
+                return GetPartByGender(_units[hundreds], GrammaticalGender.Feminine) + " sute";
             }
         }
 
diff --git a/src/Humanizer/Localisation/NumberToWords/Romanian/RomanianOrdinalNumberConverter.cs b/src/Humanizer/Localisation/NumberToWords/Romanian/RomanianOrdinalNumberConverter.cs
index 5b18eaf19..c0aa71ee1 100644
--- a/src/Humanizer/Localisation/NumberToWords/Romanian/RomanianOrdinalNumberConverter.cs
+++ b/src/Humanizer/Localisation/NumberToWords/Romanian/RomanianOrdinalNumberConverter.cs
@@ -33,14 +33,14 @@ public string Convert(int number, GrammaticalGender gender)
             else if (number == 1)
             {
                 // no prefixes for primul/prima
-                return this.getPartByGender(_ordinalsUnder10[number], gender);
+                return GetPartByGender(_ordinalsUnder10[number], gender);
             }
             else if (number <= 9)
             {
                 // units ordinals, 2 to 9, are totally different than the rest: treat them as a distinct case
                 return string.Format("{0} {1}",
                                         gender == GrammaticalGender.Feminine ? _femininePrefix : _masculinePrefix,
-                                        this.getPartByGender(_ordinalsUnder10[number], gender)
+                                        GetPartByGender(_ordinalsUnder10[number], gender)
                                      );
             }
             else
@@ -111,7 +111,7 @@ public string Convert(int number, GrammaticalGender gender)
             }
         }
 
-        private string getPartByGender(string multiGenderPart, GrammaticalGender gender)
+        private static string GetPartByGender(string multiGenderPart, GrammaticalGender gender)
         {
             if (multiGenderPart.Contains("|"))
             {
diff --git a/src/Humanizer/Localisation/NumberToWords/UzbekCyrlNumberToWordConverter.cs b/src/Humanizer/Localisation/NumberToWords/UzbekCyrlNumberToWordConverter.cs
index 087423f69..aca465891 100644
--- a/src/Humanizer/Localisation/NumberToWords/UzbekCyrlNumberToWordConverter.cs
+++ b/src/Humanizer/Localisation/NumberToWords/UzbekCyrlNumberToWordConverter.cs
@@ -22,14 +22,14 @@ public override string Convert(long input)
             return Convert(number, true);
         }
 
-        private string Convert(int number, bool checkForHoundredRule)
+        private static string Convert(int number, bool checkForHundredRule)
         {
             if (number == 0)
             {
                 return UnitsMap[0];
             }
 
-            if (checkForHoundredRule && number == 100)
+            if (checkForHundredRule && number == 100)
             {
                 return "юз";
             }
diff --git a/src/Humanizer/Localisation/NumberToWords/UzbekLatnNumberToWordConverter.cs b/src/Humanizer/Localisation/NumberToWords/UzbekLatnNumberToWordConverter.cs
index 694a56828..1aeddd37c 100644
--- a/src/Humanizer/Localisation/NumberToWords/UzbekLatnNumberToWordConverter.cs
+++ b/src/Humanizer/Localisation/NumberToWords/UzbekLatnNumberToWordConverter.cs
@@ -22,14 +22,14 @@ public override string Convert(long input)
             return Convert(number, true);
         }
 
-        private string Convert(int number, bool checkForHoundredRule)
+        private static string Convert(int number, bool checkForHundredRule)
         {
             if (number == 0)
             {
                 return UnitsMap[0];
             }
 
-            if (checkForHoundredRule && number == 100)
+            if (checkForHundredRule && number == 100)
             {
                 return "yuz";
             }