What is 15/32 plus 11/21? (Answer: 667/672)

Exact Answer

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Problem: What is 15/32 plus 11/21?
Formula / Expression: 15/32 + 11/21
Final Answer: 667/672
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Step-by-Step Solution:

Step 1: Find the Least Common Denominator (LCD)
The denominators 32 and 21 are coprime (they share no common factors other than 1). Therefore, their Least Common Denominator (LCD) is simply their direct product: 32 × 21 = 672.
Working: LCD(32, 21) = 672

Step 2: Convert to Equivalent Fractions with Common Denominator 672
Multiply the numerator and denominator of 15/32 by 21, and multiply the numerator and denominator of 11/21 by 32 so both fractions share the common base 672.
Working: 15 × 21/32 × 21 = 315/672 and 11 × 32/21 × 32 = 352/672

Step 3: Add the Numerators
Now add the numerators (315 + 352 = 667) and keep the common denominator 672 unchanged.
Working: 315 + 352/672 = 667/672

Step 4: Check if the Fraction Can Be Simplified
The Greatest Common Divisor (GCD) of 667 and 672 is 1, confirming that 667/672 cannot be reduced further—it is already in its simplest irreducible form.
Working: 667/672

Step 5: Decimal & Percentage Representation
Dividing the numerator 667 by denominator 672 produces a repeating decimal (approximately 0.99256, or 99.256%).
Working: 667 ÷ 672 = 0.99256 (99.256%)

Key Values:
- Simplified Fraction: 667/672
- Mixed Number Form: 667/672
- Decimal Value: 0.99256
- Percentage: 99.256%

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Solved with FractionsCalc:
https://fractionscalc.com/what-is-15-32-plus-11-21/
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15/32 + 11/21 = 667/672

Simplified Fraction

667/672

Mixed Number

Proper (667/672)

Decimal Value

0.99256

Percentage

99.256%

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Step-by-Step Solution: 15/32 + 11/21

Step 1

Find the Least Common Denominator (LCD)

The denominators 32 and 21 are coprime (they share no common factors other than 1). Therefore, their Least Common Denominator (LCD) is simply their direct product: 32 × 21 = 672.

LCD(32, 21) = 672

Step 2

Convert to Equivalent Fractions with Common Denominator 672

Multiply the numerator and denominator of 15/32 by 21, and multiply the numerator and denominator of 11/21 by 32 so both fractions share the common base 672.

15 × 21/32 × 21 = 315/672 and 11 × 32/21 × 32 = 352/672

Step 3

Add the Numerators

Now add the numerators (315 + 352 = 667) and keep the common denominator 672 unchanged.

315 + 352/672 = 667/672

Step 4

Check if the Fraction Can Be Simplified

The Greatest Common Divisor (GCD) of 667 and 672 is 1, confirming that 667/672 cannot be reduced further—it is already in its simplest irreducible form.

667/672

Step 5

Decimal & Percentage Representation

Dividing the numerator 667 by denominator 672 produces a repeating decimal (approximately 0.99256, or 99.256%).

667 ÷ 672 = 0.99256 (99.256%)

Visual Representation

The diagram below illustrates 15/32 plus 11/21 visually:

Summary & Alternative Representations

Property / Format	Value
Lowest Terms Fraction	`667/672`
Mixed Number Form	`667/672`
Decimal Form	`0.99256`
Percentage	`99.256%`

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Frequently Asked Questions

What is 15/32 plus 11/21 as a fraction?

15/32 + 11/21 in simplest fraction form is 667/672.

What is 15/32 plus 11/21 as a decimal?

15/32 + 11/21 converted to a decimal is 0.99256.

What is 15/32 plus 11/21 as a percentage?

15/32 + 11/21 expressed as a percentage is 99.256%.

Does 15/32 plus 11/21 result in a terminating or repeating decimal?

It results in a repeating decimal (approximately 0.99256...) because the denominator contains prime factors other than 2 and 5.