What is 5/56 plus 9/21? (Answer: 29/56)

Exact Answer

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Problem: What is 5/56 plus 9/21?
Formula / Expression: 5/56 + 9/21
Final Answer: 29/56
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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 9/21 by 8 so both fractions share the common base 168.
Working: 5 × 3/56 × 3 = 15/168 and 9 × 8/21 × 8 = 72/168

Step 3: Add the Numerators
Now add the numerators (15 + 72 = 87) and keep the common denominator 168 unchanged.
Working: 15 + 72/168 = 87/168

Step 4: Simplify the Fraction to Lowest Terms
Find the Greatest Common Divisor (GCD) of 87 and 168, which is 3. Divide both the numerator and denominator by 3.
Working: 87 ÷ 3/168 ÷ 3 = 29/56

Step 5: Decimal & Percentage Representation
Dividing the numerator 29 by denominator 56 produces a repeating decimal (approximately 0.517857, or 51.7857%).
Working: 29 ÷ 56 = 0.517857 (51.7857%)

Key Values:
- Simplified Fraction: 29/56
- Mixed Number Form: 29/56
- Decimal Value: 0.517857
- Percentage: 51.7857%

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Solved with FractionsCalc:
https://fractionscalc.com/what-is-5-56-plus-9-21/
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5/56 + 9/21 = 29/56

Simplified Fraction

29/56

Mixed Number

Proper (29/56)

Decimal Value

0.517857

Percentage

51.7857%

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Step-by-Step Solution: 5/56 + 9/21

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 9/21 by 8 so both fractions share the common base 168.

5 × 3/56 × 3 = 15/168 and 9 × 8/21 × 8 = 72/168

Step 3

Add the Numerators

Now add the numerators (15 + 72 = 87) and keep the common denominator 168 unchanged.

15 + 72/168 = 87/168

Step 4

Simplify the Fraction to Lowest Terms

Find the Greatest Common Divisor (GCD) of 87 and 168, which is 3. Divide both the numerator and denominator by 3.

87 ÷ 3/168 ÷ 3 = 29/56

Step 5

Decimal & Percentage Representation

Dividing the numerator 29 by denominator 56 produces a repeating decimal (approximately 0.517857, or 51.7857%).

29 ÷ 56 = 0.517857 (51.7857%)

Visual Representation

The diagram below illustrates 5/56 plus 9/21 visually:

Summary & Alternative Representations

Property / Format	Value
Lowest Terms Fraction	`29/56`
Mixed Number Form	`29/56`
Decimal Form	`0.517857`
Percentage	`51.7857%`

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Frequently Asked Questions

What is 5/56 plus 9/21 as a fraction?

5/56 + 9/21 in simplest fraction form is 29/56.

What is 5/56 plus 9/21 as a decimal?

5/56 + 9/21 converted to a decimal is 0.517857.

What is 5/56 plus 9/21 as a percentage?

5/56 + 9/21 expressed as a percentage is 51.7857%.

Does 5/56 plus 9/21 result in a terminating or repeating decimal?

It results in a repeating decimal (approximately 0.517857...) because the denominator contains prime factors other than 2 and 5.