What is 7/56 plus 5/21? (Answer: 61/168)

Exact Answer

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Problem: What is 7/56 plus 5/21?
Formula / Expression: 7/56 + 5/21
Final Answer: 61/168
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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 7/56 by 3, and multiply the numerator and denominator of 5/21 by 8 so both fractions share the common base 168.
Working: 7 × 3/56 × 3 = 21/168 and 5 × 8/21 × 8 = 40/168

Step 3: Add the Numerators
Now add the numerators (21 + 40 = 61) and keep the common denominator 168 unchanged.
Working: 21 + 40/168 = 61/168

Step 4: Check if the Fraction Can Be Simplified
The Greatest Common Divisor (GCD) of 61 and 168 is 1, confirming that 61/168 cannot be reduced further—it is already in its simplest irreducible form.
Working: 61/168

Step 5: Decimal & Percentage Representation
Dividing the numerator 61 by denominator 168 produces a repeating decimal (approximately 0.363095, or 36.3095%).
Working: 61 ÷ 168 = 0.363095 (36.3095%)

Key Values:
- Simplified Fraction: 61/168
- Mixed Number Form: 61/168
- Decimal Value: 0.363095
- Percentage: 36.3095%

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Solved with FractionsCalc:
https://fractionscalc.com/what-is-7-56-plus-5-21/
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7/56 + 5/21 = 61/168

Simplified Fraction

61/168

Mixed Number

Proper (61/168)

Decimal Value

0.363095

Percentage

36.3095%

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Step-by-Step Solution: 7/56 + 5/21

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 7/56 by 3, and multiply the numerator and denominator of 5/21 by 8 so both fractions share the common base 168.

7 × 3/56 × 3 = 21/168 and 5 × 8/21 × 8 = 40/168

Step 3

Add the Numerators

Now add the numerators (21 + 40 = 61) and keep the common denominator 168 unchanged.

21 + 40/168 = 61/168

Step 4

Check if the Fraction Can Be Simplified

The Greatest Common Divisor (GCD) of 61 and 168 is 1, confirming that 61/168 cannot be reduced further—it is already in its simplest irreducible form.

61/168

Step 5

Decimal & Percentage Representation

Dividing the numerator 61 by denominator 168 produces a repeating decimal (approximately 0.363095, or 36.3095%).

61 ÷ 168 = 0.363095 (36.3095%)

Visual Representation

The diagram below illustrates 7/56 plus 5/21 visually:

Summary & Alternative Representations

Property / Format	Value
Lowest Terms Fraction	`61/168`
Mixed Number Form	`61/168`
Decimal Form	`0.363095`
Percentage	`36.3095%`

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Frequently Asked Questions

What is 7/56 plus 5/21 as a fraction?

7/56 + 5/21 in simplest fraction form is 61/168.

What is 7/56 plus 5/21 as a decimal?

7/56 + 5/21 converted to a decimal is 0.363095.

What is 7/56 plus 5/21 as a percentage?

7/56 + 5/21 expressed as a percentage is 36.3095%.

Does 7/56 plus 5/21 result in a terminating or repeating decimal?

It results in a repeating decimal (approximately 0.363095...) because the denominator contains prime factors other than 2 and 5.