What is 12/60 plus 8/21? (Answer: 61/105)

Exact Answer

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Problem: What is 12/60 plus 8/21?
Formula / Expression: 12/60 + 8/21
Final Answer: 61/105
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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 12/60 by 7, and multiply the numerator and denominator of 8/21 by 20 so both fractions share the common base 420.
Working: 12 × 7/60 × 7 = 84/420 and 8 × 20/21 × 20 = 160/420

Step 3: Add the Numerators
Now add the numerators (84 + 160 = 244) and keep the common denominator 420 unchanged.
Working: 84 + 160/420 = 244/420

Step 4: Simplify the Fraction to Lowest Terms
Find the Greatest Common Divisor (GCD) of 244 and 420, which is 4. Divide both the numerator and denominator by 4.
Working: 244 ÷ 4/420 ÷ 4 = 61/105

Step 5: Decimal & Percentage Representation
Dividing the numerator 61 by denominator 105 produces a repeating decimal (approximately 0.580952, or 58.0952%).
Working: 61 ÷ 105 = 0.580952 (58.0952%)

Key Values:
- Simplified Fraction: 61/105
- Mixed Number Form: 61/105
- Decimal Value: 0.580952
- Percentage: 58.0952%

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Solved with FractionsCalc:
https://fractionscalc.com/what-is-12-60-plus-8-21/
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12/60 + 8/21 = 61/105

Simplified Fraction

61/105

Mixed Number

Proper (61/105)

Decimal Value

0.580952

Percentage

58.0952%

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Step-by-Step Solution: 12/60 + 8/21

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 12/60 by 7, and multiply the numerator and denominator of 8/21 by 20 so both fractions share the common base 420.

12 × 7/60 × 7 = 84/420 and 8 × 20/21 × 20 = 160/420

Step 3

Add the Numerators

Now add the numerators (84 + 160 = 244) and keep the common denominator 420 unchanged.

84 + 160/420 = 244/420

Step 4

Simplify the Fraction to Lowest Terms

Find the Greatest Common Divisor (GCD) of 244 and 420, which is 4. Divide both the numerator and denominator by 4.

244 ÷ 4/420 ÷ 4 = 61/105

Step 5

Decimal & Percentage Representation

Dividing the numerator 61 by denominator 105 produces a repeating decimal (approximately 0.580952, or 58.0952%).

61 ÷ 105 = 0.580952 (58.0952%)

Visual Representation

The diagram below illustrates 12/60 plus 8/21 visually:

Summary & Alternative Representations

Property / Format	Value
Lowest Terms Fraction	`61/105`
Mixed Number Form	`61/105`
Decimal Form	`0.580952`
Percentage	`58.0952%`

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Frequently Asked Questions

What is 12/60 plus 8/21 as a fraction?

12/60 + 8/21 in simplest fraction form is 61/105.

What is 12/60 plus 8/21 as a decimal?

12/60 + 8/21 converted to a decimal is 0.580952.

What is 12/60 plus 8/21 as a percentage?

12/60 + 8/21 expressed as a percentage is 58.0952%.

Does 12/60 plus 8/21 result in a terminating or repeating decimal?

It results in a repeating decimal (approximately 0.580952...) because the denominator contains prime factors other than 2 and 5.