What is 5/56 plus 3/21? (Answer: 13/56)

Exact Answer

==================================================
Problem: What is 5/56 plus 3/21?
Formula / Expression: 5/56 + 3/21
Final Answer: 13/56
==================================================

Step-by-Step Solution:

Step 1: Find the Least Common Denominator (LCD)
The denominators 56 and 21 share a common factor (GCD = 7). Finding their Least Common Multiple gives an LCD of 168 (which is smaller than their product 56 × 21 = 1176, keeping the calculation simpler).
Working: LCD(56, 21) = 168

Step 2: Convert to Equivalent Fractions with Common Denominator 168
Multiply the numerator and denominator of 5/56 by 3, and multiply the numerator and denominator of 3/21 by 8 so both fractions share the common base 168.
Working: 5 × 3/56 × 3 = 15/168 and 3 × 8/21 × 8 = 24/168

Step 3: Add the Numerators
Now add the numerators (15 + 24 = 39) and keep the common denominator 168 unchanged.
Working: 15 + 24/168 = 39/168

Step 4: Simplify the Fraction to Lowest Terms
Find the Greatest Common Divisor (GCD) of 39 and 168, which is 3. Divide both the numerator and denominator by 3.
Working: 39 ÷ 3/168 ÷ 3 = 13/56

Step 5: Decimal & Percentage Representation
Dividing the numerator 13 by denominator 56 produces a repeating decimal (approximately 0.232143, or 23.2143%).
Working: 13 ÷ 56 = 0.232143 (23.2143%)

Key Values:
- Simplified Fraction: 13/56
- Mixed Number Form: 13/56
- Decimal Value: 0.232143
- Percentage: 23.2143%

--------------------------------------------------
Solved with FractionsCalc:
https://fractionscalc.com/what-is-5-56-plus-3-21/
==================================================

5/56 + 3/21 = 13/56

Simplified Fraction

13/56

Mixed Number

Proper (13/56)

Decimal Value

0.232143

Percentage

23.2143%

Reduce / Convert Fraction:

Convert Fraction:

Enter Decimal Number:

Enter Percentage: %

What is % of

From Value: To Value:

Simplify Ratio: :

Switch to Proportion / Missing X Solver (A/B = C/D) →

Enter 3 known numbers and leave 1 empty (or type x) to solve:

← Switch to Ratio Simplifier (A:B)

Provide any 2 values below to calculate the remaining:

Price before discount

Discount

Price after discount

You saved

+ Add Sales Tax & Extra Coupon (Optional)

Sales Tax: % Extra Off: %

Provide any 2 values below to calculate the remaining:

Cost

Markup

REVENUE

Gross Profit

Profit Margin

Bill Subtotal

Tip Percentage

Split (People)

👥

Quick Tip:

Total Bill

Split Between

👥

Tip % (Optional)

Include Tip:

Total Price

Quantity

Unit of Measure

← Discount & Sales Tax • Ratio Simplifier (A:B) →

First Number: Second Number:

Find All Factors of:

Dividend: ÷ Divisor:

Number to Round: To Nearest:

Method: Standard (5+ ↑) Always Up (Ceil) Always Down (Floor)

Presets:

√ Square Root of: OR Power (x^y): ^{^}

x² + x + = 0

Number (n! & log):

Circle Radius (r):

Side a: Side b:

Angle (Degrees): °

Numbers (comma separated):

Total Items (n): Choose (r):

Decimal Number:

Number (1–3999):

Step-by-Step Solution: 5/56 + 3/21

Step 1

Find the Least Common Denominator (LCD)

The denominators 56 and 21 share a common factor (GCD = 7). Finding their Least Common Multiple gives an LCD of 168 (which is smaller than their product 56 × 21 = 1176, keeping the calculation simpler).

LCD(56, 21) = 168

Step 2

Convert to Equivalent Fractions with Common Denominator 168

Multiply the numerator and denominator of 5/56 by 3, and multiply the numerator and denominator of 3/21 by 8 so both fractions share the common base 168.

5 × 3/56 × 3 = 15/168 and 3 × 8/21 × 8 = 24/168

Step 3

Add the Numerators

Now add the numerators (15 + 24 = 39) and keep the common denominator 168 unchanged.

15 + 24/168 = 39/168

Step 4

Simplify the Fraction to Lowest Terms

Find the Greatest Common Divisor (GCD) of 39 and 168, which is 3. Divide both the numerator and denominator by 3.

39 ÷ 3/168 ÷ 3 = 13/56

Step 5

Decimal & Percentage Representation

Dividing the numerator 13 by denominator 56 produces a repeating decimal (approximately 0.232143, or 23.2143%).

13 ÷ 56 = 0.232143 (23.2143%)

Visual Representation

The diagram below illustrates 5/56 plus 3/21 visually:

Summary & Alternative Representations

Property / Format	Value
Lowest Terms Fraction	`13/56`
Mixed Number Form	`13/56`
Decimal Form	`0.232143`
Percentage	`23.2143%`

Was this solution helpful?

Help us improve our free step-by-step tools

Frequently Asked Questions

What is 5/56 plus 3/21 as a fraction?

5/56 + 3/21 in simplest fraction form is 13/56.

What is 5/56 plus 3/21 as a decimal?

5/56 + 3/21 converted to a decimal is 0.232143.

What is 5/56 plus 3/21 as a percentage?

5/56 + 3/21 expressed as a percentage is 23.2143%.

Does 5/56 plus 3/21 result in a terminating or repeating decimal?

It results in a repeating decimal (approximately 0.232143...) because the denominator contains prime factors other than 2 and 5.