diff --git a/src/expressions/expressions.ts b/src/expressions/expressions.ts
index 89f91b323b..c1f2304e44 100644
--- a/src/expressions/expressions.ts
+++ b/src/expressions/expressions.ts
@@ -264,7 +264,7 @@ export class Const extends Operand {
       return value.substring(1, value.length - 1);
     if (OperandMaker.isNumeric(value)) {
       if (value.indexOf("0x") == 0) return parseInt(value);
-      if (value.length > 1 && value[0] == "0") return value;
+      if (value.length > 1 && value[0] == "0" && (value.length < 2 || (value[1] !== "." && value[1] !== ","))) return value;
       return parseFloat(value);
     }
     return value;
diff --git a/src/helpers.ts b/src/helpers.ts
index aaaed4057d..aff744b312 100644
--- a/src/helpers.ts
+++ b/src/helpers.ts
@@ -342,6 +342,7 @@ export class Helpers {
       }
       return a + b;
     }
+    if(typeof a === "string" || typeof b === "string") return a + b;
     return Helpers.correctAfterPlusMinis(a, b, a + b);
   }
   public static correctAfterMultiple(a: number, b: number, res: number): number {
diff --git a/tests/expressions/expressionParserTest.ts b/tests/expressions/expressionParserTest.ts
index 3b4a45847a..62684452a8 100644
--- a/tests/expressions/expressionParserTest.ts
+++ b/tests/expressions/expressionParserTest.ts
@@ -1450,4 +1450,9 @@ QUnit.test("year, month, day, weekday", function(assert) {
   assert.deepEqual(runner.run({}), new Date().getDate(), "current day");
   runner = new ExpressionRunner("weekday()");
   assert.deepEqual(runner.run({}), new Date().getDay(), "current weekday");
+});
+QUnit.test("Sum two float numbers as string", function(assert) {
+  let runner = new ExpressionRunner("{a} + {b}");
+  assert.equal(runner.run({ a: "1.1", b: "2.2" }), 3.3, "#1");
+  assert.equal(runner.run({ a: "0.1", b: "0.2" }), 0.3, "#2");
 });
\ No newline at end of file
diff --git a/tests/helperstests.ts b/tests/helperstests.ts
index 21a0d80399..7e2449fec1 100644
--- a/tests/helperstests.ts
+++ b/tests/helperstests.ts
@@ -311,6 +311,8 @@ QUnit.test("Helpers.isNumber", function(assert) {
   assert.equal(Helpers.isNumber("0xabcd"), true, "0xabcd is a number");
   assert.equal(Helpers.isNumber("23.3"), true, "23.3 is a number");
   assert.equal(Helpers.isNumber("abcd"), false, "abcd is not a number");
+  assert.equal(Helpers.isNumber("0.1"), true, "0.1 is number");
+  assert.equal(Helpers.isNumber("0.2"), true, "0.2 is number");
   assert.equal(
     Helpers.isNumber("0xbe0eb53f46cd790cd13851d5eff43d12404d33e8"),
     false,
@@ -493,6 +495,7 @@ QUnit.test("sumAnyValues", function(assert) {
   assert.equal(Helpers.sumAnyValues([1, 2, 3], 4), 10, "[1, 2, 3] + 10");
   assert.equal(Helpers.sumAnyValues(["a", "b", "c"], " "), "a, b, c ", "['a', 'b', 'c'] + ' '");
   assert.equal(Helpers.sumAnyValues(["a", "b", "c"], ""), "a, b, c", "['a', 'b', 'c'] + ''");
+  assert.equal(Helpers.sumAnyValues("0.1", "0.2"), "0.10.2", "'0.1' + '0.2'");
 });
 QUnit.test("isValueObject", function(assert) {
   assert.equal(Helpers.isValueObject("abc"), false, "abc");