What is 9/60 plus 8/21? (Answer: 223/420)

Exact Answer

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Problem: What is 9/60 plus 8/21?
Formula / Expression: 9/60 + 8/21
Final Answer: 223/420
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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 9/60 by 7, and multiply the numerator and denominator of 8/21 by 20 so both fractions share the common base 420.
Working: 9 × 7/60 × 7 = 63/420 and 8 × 20/21 × 20 = 160/420

Step 3: Add the Numerators
Now add the numerators (63 + 160 = 223) and keep the common denominator 420 unchanged.
Working: 63 + 160/420 = 223/420

Step 4: Check if the Fraction Can Be Simplified
The Greatest Common Divisor (GCD) of 223 and 420 is 1, confirming that 223/420 cannot be reduced further—it is already in its simplest irreducible form.
Working: 223/420

Step 5: Decimal & Percentage Representation
Dividing the numerator 223 by denominator 420 produces a repeating decimal (approximately 0.530952, or 53.0952%).
Working: 223 ÷ 420 = 0.530952 (53.0952%)

Key Values:
- Simplified Fraction: 223/420
- Mixed Number Form: 223/420
- Decimal Value: 0.530952
- Percentage: 53.0952%

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Solved with FractionsCalc:
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9/60 + 8/21 = 223/420

Simplified Fraction

223/420

Mixed Number

Proper (223/420)

Decimal Value

0.530952

Percentage

53.0952%

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Step-by-Step Solution: 9/60 + 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 9/60 by 7, and multiply the numerator and denominator of 8/21 by 20 so both fractions share the common base 420.

9 × 7/60 × 7 = 63/420 and 8 × 20/21 × 20 = 160/420

Step 3

Add the Numerators

Now add the numerators (63 + 160 = 223) and keep the common denominator 420 unchanged.

63 + 160/420 = 223/420

Step 4

Check if the Fraction Can Be Simplified

The Greatest Common Divisor (GCD) of 223 and 420 is 1, confirming that 223/420 cannot be reduced further—it is already in its simplest irreducible form.

223/420

Step 5

Decimal & Percentage Representation

Dividing the numerator 223 by denominator 420 produces a repeating decimal (approximately 0.530952, or 53.0952%).

223 ÷ 420 = 0.530952 (53.0952%)

Visual Representation

The diagram below illustrates 9/60 plus 8/21 visually:

Summary & Alternative Representations

Property / Format	Value
Lowest Terms Fraction	`223/420`
Mixed Number Form	`223/420`
Decimal Form	`0.530952`
Percentage	`53.0952%`

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Frequently Asked Questions

What is 9/60 plus 8/21 as a fraction?

9/60 + 8/21 in simplest fraction form is 223/420.

What is 9/60 plus 8/21 as a decimal?

9/60 + 8/21 converted to a decimal is 0.530952.

What is 9/60 plus 8/21 as a percentage?

9/60 + 8/21 expressed as a percentage is 53.0952%.

Does 9/60 plus 8/21 result in a terminating or repeating decimal?

It results in a repeating decimal (approximately 0.530952...) because the denominator contains prime factors other than 2 and 5.