What is 5/60 plus 4/21? (Answer: 23/84)

Exact Answer

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Problem: What is 5/60 plus 4/21?
Formula / Expression: 5/60 + 4/21
Final Answer: 23/84
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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 4/21 by 20 so both fractions share the common base 420.
Working: 5 × 7/60 × 7 = 35/420 and 4 × 20/21 × 20 = 80/420

Step 3: Add the Numerators
Now add the numerators (35 + 80 = 115) and keep the common denominator 420 unchanged.
Working: 35 + 80/420 = 115/420

Step 4: Simplify the Fraction to Lowest Terms
Find the Greatest Common Divisor (GCD) of 115 and 420, which is 5. Divide both the numerator and denominator by 5.
Working: 115 ÷ 5/420 ÷ 5 = 23/84

Step 5: Decimal & Percentage Representation
Dividing the numerator 23 by denominator 84 produces a repeating decimal (approximately 0.27381, or 27.381%).
Working: 23 ÷ 84 = 0.27381 (27.381%)

Key Values:
- Simplified Fraction: 23/84
- Mixed Number Form: 23/84
- Decimal Value: 0.27381
- Percentage: 27.381%

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Solved with FractionsCalc:
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5/60 + 4/21 = 23/84

Simplified Fraction

23/84

Mixed Number

Proper (23/84)

Decimal Value

0.27381

Percentage

27.381%

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Step-by-Step Solution: 5/60 + 4/21

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 4/21 by 20 so both fractions share the common base 420.

5 × 7/60 × 7 = 35/420 and 4 × 20/21 × 20 = 80/420

Step 3

Add the Numerators

Now add the numerators (35 + 80 = 115) and keep the common denominator 420 unchanged.

35 + 80/420 = 115/420

Step 4

Simplify the Fraction to Lowest Terms

Find the Greatest Common Divisor (GCD) of 115 and 420, which is 5. Divide both the numerator and denominator by 5.

115 ÷ 5/420 ÷ 5 = 23/84

Step 5

Decimal & Percentage Representation

Dividing the numerator 23 by denominator 84 produces a repeating decimal (approximately 0.27381, or 27.381%).

23 ÷ 84 = 0.27381 (27.381%)

Visual Representation

The diagram below illustrates 5/60 plus 4/21 visually:

Summary & Alternative Representations

Property / Format	Value
Lowest Terms Fraction	`23/84`
Mixed Number Form	`23/84`
Decimal Form	`0.27381`
Percentage	`27.381%`

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Frequently Asked Questions

What is 5/60 plus 4/21 as a fraction?

5/60 + 4/21 in simplest fraction form is 23/84.

What is 5/60 plus 4/21 as a decimal?

5/60 + 4/21 converted to a decimal is 0.27381.

What is 5/60 plus 4/21 as a percentage?

5/60 + 4/21 expressed as a percentage is 27.381%.

Does 5/60 plus 4/21 result in a terminating or repeating decimal?

It results in a repeating decimal (approximately 0.27381...) because the denominator contains prime factors other than 2 and 5.