diff --git a/__tests__/number.test.ts b/__tests__/number.test.ts
index fa3f2e4d..ac3d6294 100644
--- a/__tests__/number.test.ts
+++ b/__tests__/number.test.ts
@@ -1,5 +1,6 @@
 import {
   convertNumberToRomanNumeral,
+  formatNumberToFraction,
   roundToString,
   roundToNumber,
 } from '@/utility/number';
@@ -17,6 +18,28 @@ describe('number', () => {
     expect(convertNumberToRomanNumeral(9)).toBe('IX');
     expect(convertNumberToRomanNumeral(10)).toBe('X');
   });
+  it('formats decimals to fractions', () => {
+    expect(formatNumberToFraction(0.1666666)).toBe('+1/6');
+    expect(formatNumberToFraction(0.25)).toBe('+1/4');
+    expect(formatNumberToFraction(0.3333333)).toBe('+1/3');
+    expect(formatNumberToFraction(0.5)).toBe('+1/2');
+    expect(formatNumberToFraction(0.6666666)).toBe('+2/3');
+    expect(formatNumberToFraction(0.75)).toBe('+3/4');
+    expect(formatNumberToFraction(0.8333333)).toBe('+5/6');
+    expect(formatNumberToFraction(1.6666666)).toBe('+1 2/3');
+    expect(formatNumberToFraction(1.75)).toBe('+1 3/4');
+    expect(formatNumberToFraction(10.75)).toBe('+10 3/4');
+    expect(formatNumberToFraction(-0.1666666)).toBe('-1/6');
+    expect(formatNumberToFraction(-0.25)).toBe('-1/4');
+    expect(formatNumberToFraction(-0.3333333)).toBe('-1/3');
+    expect(formatNumberToFraction(-0.5)).toBe('-1/2');
+    expect(formatNumberToFraction(-0.6666666)).toBe('-2/3');
+    expect(formatNumberToFraction(-0.75)).toBe('-3/4');
+    expect(formatNumberToFraction(-0.8333333)).toBe('-5/6');
+    expect(formatNumberToFraction(-1.6666666)).toBe('-1 2/3');
+    expect(formatNumberToFraction(-1.75)).toBe('-1 3/4');
+    expect(formatNumberToFraction(-10.75)).toBe('-10 3/4');
+  });
   describe('rounds to a', () => {
     it('string', () => {
       expect(roundToString(1.2345, 1)).toBe('1.2');
diff --git a/src/utility/number.ts b/src/utility/number.ts
index f097c6f5..dc48b4f6 100644
--- a/src/utility/number.ts
+++ b/src/utility/number.ts
@@ -21,14 +21,22 @@ const gcd = (a: number, b: number): number => {
   }
 };
 
+const FRACTION_TOLERANCE = 0.011;
+const STICKY_DECIMALS = [0.25, 0.33, 0.5, 0.66, 0.75];
+const MAX_FRACTION_LENGTH = 4; // Permit 1/64 but not 1/100
+
 const formatDecimalToFraction = (_decimal: number) => {
   // Prevent imprecision which causes numbers such as,
   // 0.1 to equal 0.10000000000000009
   const decimal = parseFloat(_decimal.toPrecision(8));
-  if (Math.abs(Math.abs(decimal) - 0.33) < 0.011) {
+  if (Math.abs(Math.abs(decimal) - 0.167) <= FRACTION_TOLERANCE) {
+    return '1/6';
+  } else if (Math.abs(Math.abs(decimal) - 0.333) <= FRACTION_TOLERANCE) {
     return '1/3';
-  } else if (Math.abs(Math.abs(decimal) - 0.66) <= 0.011) {
+  } else if (Math.abs(Math.abs(decimal) - 0.667) <= FRACTION_TOLERANCE) {
     return '2/3';
+  } else if (Math.abs(Math.abs(decimal) - 0.833) <= FRACTION_TOLERANCE) {
+    return '5/6';
   } else {
     const length = decimal.toString().length - 2;
 
@@ -44,19 +52,15 @@ const formatDecimalToFraction = (_decimal: number) => {
   }
 };
 
-const STICKY_THRESHOLD = 0.011;
-const STICKY_DECIMALS = [0.25, 0.33, 0.5, 0.66, 0.75];
-const MAX_FRACTION_LENGTH = 4; // Permit 1/64 but not 1/100
-
 export const formatNumberToFraction = (number: number) => {
   const sign = number >= 0 ? '+' : '-';
 
-  let decimal = (1 - Math.abs(number % 1)) > STICKY_THRESHOLD
+  let decimal = (1 - Math.abs(number % 1)) > FRACTION_TOLERANCE
     ? number % 1
     : 0;
   if (decimal !== 0) {
     for (const stickyDecimal of STICKY_DECIMALS) {
-      if (Math.abs(Math.abs(decimal) - stickyDecimal) < STICKY_THRESHOLD) {
+      if (Math.abs(Math.abs(decimal) - stickyDecimal) < FRACTION_TOLERANCE) {
         decimal = decimal < 0 ? -stickyDecimal : stickyDecimal;
         break;
       }