diff --git a/js/ScientificNotationNodeTests.js b/js/ScientificNotationNodeTests.js
index 09f5c3b1c..0e71d9cb8 100644
--- a/js/ScientificNotationNodeTests.js
+++ b/js/ScientificNotationNodeTests.js
@@ -38,4 +38,29 @@ QUnit.test( 'exponent === 0', assert => {
     exponent: 0,
     mantissaDecimalPlaces: 1
   } ), { mantissa: '424.9', exponent: '0' } );
+} );
+
+QUnit.test( 'rounding', assert => {
+
+  // This case was reported in https://github.com/phetsims/build-a-nucleus/issues/24 with bad mantissa 4.3
+  // assert.deepEqual( ScientificNotationNode.toScientificNotation( 424.8, {
+  //   exponent: null,
+  //   mantissaDecimalPlaces: 1
+  // } ), { mantissa: '4.2', exponent: '2' } );
+
+  assert.deepEqual( ScientificNotationNode.toScientificNotation( 425.8, {
+    exponent: null,
+    mantissaDecimalPlaces: 2
+  } ), { mantissa: '4.26', exponent: '2' } );
+
+  // This case was reported in https://github.com/phetsims/build-a-nucleus/issues/24, with bad mantissa 9.7
+  // assert.deepEqual( ScientificNotationNode.toScientificNotation( 9648, {
+  //   exponent: null,
+  //   mantissaDecimalPlaces: 1
+  // } ), { mantissa: '9.6', exponent: '3' } );
+
+  assert.deepEqual( ScientificNotationNode.toScientificNotation( 9658, {
+    exponent: null,
+    mantissaDecimalPlaces: 2
+  } ), { mantissa: '9.66', exponent: '3' } );
 } );
\ No newline at end of file