What is 5/56 plus 5/21? (Answer: 55/168)

Exact Answer

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Problem: What is 5/56 plus 5/21?
Formula / Expression: 5/56 + 5/21
Final Answer: 55/168
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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 5/56 by 3, and multiply the numerator and denominator of 5/21 by 8 so both fractions share the common base 168.
Working: 5 × 3/56 × 3 = 15/168 and 5 × 8/21 × 8 = 40/168

Step 3: Add the Numerators
Now add the numerators (15 + 40 = 55) and keep the common denominator 168 unchanged.
Working: 15 + 40/168 = 55/168

Step 4: Check if the Fraction Can Be Simplified
The Greatest Common Divisor (GCD) of 55 and 168 is 1, confirming that 55/168 cannot be reduced further—it is already in its simplest irreducible form.
Working: 55/168

Step 5: Decimal & Percentage Representation
Dividing the numerator 55 by denominator 168 produces a repeating decimal (approximately 0.327381, or 32.7381%).
Working: 55 ÷ 168 = 0.327381 (32.7381%)

Key Values:
- Simplified Fraction: 55/168
- Mixed Number Form: 55/168
- Decimal Value: 0.327381
- Percentage: 32.7381%

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Solved with FractionsCalc:
https://fractionscalc.com/what-is-5-56-plus-5-21/
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5/56 + 5/21 = 55/168

Simplified Fraction

55/168

Mixed Number

Proper (55/168)

Decimal Value

0.327381

Percentage

32.7381%

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Step-by-Step Solution: 5/56 + 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 5/56 by 3, and multiply the numerator and denominator of 5/21 by 8 so both fractions share the common base 168.

5 × 3/56 × 3 = 15/168 and 5 × 8/21 × 8 = 40/168

Step 3

Add the Numerators

Now add the numerators (15 + 40 = 55) and keep the common denominator 168 unchanged.

15 + 40/168 = 55/168

Step 4

Check if the Fraction Can Be Simplified

The Greatest Common Divisor (GCD) of 55 and 168 is 1, confirming that 55/168 cannot be reduced further—it is already in its simplest irreducible form.

55/168

Step 5

Decimal & Percentage Representation

Dividing the numerator 55 by denominator 168 produces a repeating decimal (approximately 0.327381, or 32.7381%).

55 ÷ 168 = 0.327381 (32.7381%)

Visual Representation

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

Summary & Alternative Representations

Property / Format	Value
Lowest Terms Fraction	`55/168`
Mixed Number Form	`55/168`
Decimal Form	`0.327381`
Percentage	`32.7381%`

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Frequently Asked Questions

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

5/56 + 5/21 in simplest fraction form is 55/168.

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

5/56 + 5/21 converted to a decimal is 0.327381.

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

5/56 + 5/21 expressed as a percentage is 32.7381%.

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

It results in a repeating decimal (approximately 0.327381...) because the denominator contains prime factors other than 2 and 5.