What is 6/60 plus 3/21? (Answer: 17/70)

Exact Answer

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Problem: What is 6/60 plus 3/21?
Formula / Expression: 6/60 + 3/21
Final Answer: 17/70
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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 6/60 by 7, and multiply the numerator and denominator of 3/21 by 20 so both fractions share the common base 420.
Working: 6 × 7/60 × 7 = 42/420 and 3 × 20/21 × 20 = 60/420

Step 3: Add the Numerators
Now add the numerators (42 + 60 = 102) and keep the common denominator 420 unchanged.
Working: 42 + 60/420 = 102/420

Step 4: Simplify the Fraction to Lowest Terms
Find the Greatest Common Divisor (GCD) of 102 and 420, which is 6. Divide both the numerator and denominator by 6.
Working: 102 ÷ 6/420 ÷ 6 = 17/70

Step 5: Decimal & Percentage Representation
Dividing the numerator 17 by denominator 70 produces a repeating decimal (approximately 0.242857, or 24.2857%).
Working: 17 ÷ 70 = 0.242857 (24.2857%)

Key Values:
- Simplified Fraction: 17/70
- Mixed Number Form: 17/70
- Decimal Value: 0.242857
- Percentage: 24.2857%

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Solved with FractionsCalc:
https://fractionscalc.com/what-is-6-60-plus-3-21/
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6/60 + 3/21 = 17/70

Simplified Fraction

17/70

Mixed Number

Proper (17/70)

Decimal Value

0.242857

Percentage

24.2857%

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Step-by-Step Solution: 6/60 + 3/21

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 6/60 by 7, and multiply the numerator and denominator of 3/21 by 20 so both fractions share the common base 420.

6 × 7/60 × 7 = 42/420 and 3 × 20/21 × 20 = 60/420

Step 3

Add the Numerators

Now add the numerators (42 + 60 = 102) and keep the common denominator 420 unchanged.

42 + 60/420 = 102/420

Step 4

Simplify the Fraction to Lowest Terms

Find the Greatest Common Divisor (GCD) of 102 and 420, which is 6. Divide both the numerator and denominator by 6.

102 ÷ 6/420 ÷ 6 = 17/70

Step 5

Decimal & Percentage Representation

Dividing the numerator 17 by denominator 70 produces a repeating decimal (approximately 0.242857, or 24.2857%).

17 ÷ 70 = 0.242857 (24.2857%)

Visual Representation

The diagram below illustrates 6/60 plus 3/21 visually:

Summary & Alternative Representations

Property / Format	Value
Lowest Terms Fraction	`17/70`
Mixed Number Form	`17/70`
Decimal Form	`0.242857`
Percentage	`24.2857%`

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Frequently Asked Questions

What is 6/60 plus 3/21 as a fraction?

6/60 + 3/21 in simplest fraction form is 17/70.

What is 6/60 plus 3/21 as a decimal?

6/60 + 3/21 converted to a decimal is 0.242857.

What is 6/60 plus 3/21 as a percentage?

6/60 + 3/21 expressed as a percentage is 24.2857%.

Does 6/60 plus 3/21 result in a terminating or repeating decimal?

It results in a repeating decimal (approximately 0.242857...) because the denominator contains prime factors other than 2 and 5.