What is 5/60 plus 5/21? (Answer: 9/28)

Exact Answer

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Problem: What is 5/60 plus 5/21?
Formula / Expression: 5/60 + 5/21
Final Answer: 9/28
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Step-by-Step Solution:

Step 1: Find the Least Common Denominator (LCD)
The denominators 60 and 21 share a common factor (GCD = 3). Finding their Least Common Multiple gives an LCD of 420 (which is smaller than their product 60 × 21 = 1260, keeping the calculation simpler).
Working: LCD(60, 21) = 420

Step 2: Convert to Equivalent Fractions with Common Denominator 420
Multiply the numerator and denominator of 5/60 by 7, and multiply the numerator and denominator of 5/21 by 20 so both fractions share the common base 420.
Working: 5 × 7/60 × 7 = 35/420 and 5 × 20/21 × 20 = 100/420

Step 3: Add the Numerators
Now add the numerators (35 + 100 = 135) and keep the common denominator 420 unchanged.
Working: 35 + 100/420 = 135/420

Step 4: Simplify the Fraction to Lowest Terms
Find the Greatest Common Divisor (GCD) of 135 and 420, which is 15. Divide both the numerator and denominator by 15.
Working: 135 ÷ 15/420 ÷ 15 = 9/28

Step 5: Decimal & Percentage Representation
Dividing the numerator 9 by denominator 28 produces a repeating decimal (approximately 0.321429, or 32.1429%).
Working: 9 ÷ 28 = 0.321429 (32.1429%)

Key Values:
- Simplified Fraction: 9/28
- Mixed Number Form: 9/28
- Decimal Value: 0.321429
- Percentage: 32.1429%

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Solved with FractionsCalc:
https://fractionscalc.com/what-is-5-60-plus-5-21/
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5/60 + 5/21 = 9/28

Simplified Fraction

9/28

Mixed Number

Proper (9/28)

Decimal Value

0.321429

Percentage

32.1429%

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Step-by-Step Solution: 5/60 + 5/21

Step 1

Find the Least Common Denominator (LCD)

The denominators 60 and 21 share a common factor (GCD = 3). Finding their Least Common Multiple gives an LCD of 420 (which is smaller than their product 60 × 21 = 1260, keeping the calculation simpler).

LCD(60, 21) = 420

Step 2

Convert to Equivalent Fractions with Common Denominator 420

Multiply the numerator and denominator of 5/60 by 7, and multiply the numerator and denominator of 5/21 by 20 so both fractions share the common base 420.

5 × 7/60 × 7 = 35/420 and 5 × 20/21 × 20 = 100/420

Step 3

Add the Numerators

Now add the numerators (35 + 100 = 135) and keep the common denominator 420 unchanged.

35 + 100/420 = 135/420

Step 4

Simplify the Fraction to Lowest Terms

Find the Greatest Common Divisor (GCD) of 135 and 420, which is 15. Divide both the numerator and denominator by 15.

135 ÷ 15/420 ÷ 15 = 9/28

Step 5

Decimal & Percentage Representation

Dividing the numerator 9 by denominator 28 produces a repeating decimal (approximately 0.321429, or 32.1429%).

9 ÷ 28 = 0.321429 (32.1429%)

Visual Representation

The diagram below illustrates 5/60 plus 5/21 visually:

Summary & Alternative Representations

Property / Format	Value
Lowest Terms Fraction	`9/28`
Mixed Number Form	`9/28`
Decimal Form	`0.321429`
Percentage	`32.1429%`

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Frequently Asked Questions

What is 5/60 plus 5/21 as a fraction?

5/60 + 5/21 in simplest fraction form is 9/28.

What is 5/60 plus 5/21 as a decimal?

5/60 + 5/21 converted to a decimal is 0.321429.

What is 5/60 plus 5/21 as a percentage?

5/60 + 5/21 expressed as a percentage is 32.1429%.

Does 5/60 plus 5/21 result in a terminating or repeating decimal?

It results in a repeating decimal (approximately 0.321429...) because the denominator contains prime factors other than 2 and 5.