What is 15/21 plus 23/32? (Answer: 321/224)

Exact Answer

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Problem: What is 15/21 plus 23/32?
Formula / Expression: 15/21 + 23/32
Final Answer: 1 97/224 (321/224)
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Step-by-Step Solution:

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

Step 2: Convert to Equivalent Fractions with Common Denominator 672
Multiply the numerator and denominator of 15/21 by 32, and multiply the numerator and denominator of 23/32 by 21 so both fractions share the common base 672.
Working: 15 × 32/21 × 32 = 480/672 and 23 × 21/32 × 21 = 483/672

Step 3: Add the Numerators
Now add the numerators (480 + 483 = 963) and keep the common denominator 672 unchanged.
Working: 480 + 483/672 = 963/672

Step 4: Simplify the Fraction to Lowest Terms
Find the Greatest Common Divisor (GCD) of 963 and 672, which is 3. Divide both the numerator and denominator by 3.
Working: 963 ÷ 3/672 ÷ 3 = 321/224

Step 5: Convert Improper Fraction to a Mixed Number
Since the numerator (321) is greater than the denominator (224), divide 321 by 224: it goes in 1 whole time(s) with a remainder of 97, giving the mixed number 1 97/224.
Working: 321/224 = 1 97/224

Step 6: Decimal & Percentage Representation
Dividing the numerator 321 by denominator 224 produces a repeating decimal (approximately 1.433036, or 143.3036%).
Working: 321 ÷ 224 = 1.433036 (143.3036%)

Key Values:
- Simplified Fraction: 321/224
- Mixed Number Form: 1 97/224
- Decimal Value: 1.433036
- Percentage: 143.3036%

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15/21 + 23/32 = 321/224

Simplified Fraction

321/224

Mixed Number

1 97/224

Decimal Value

1.433036

Percentage

143.3036%

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Step-by-Step Solution: 15/21 + 23/32

Step 1

Find the Least Common Denominator (LCD)

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

LCD(21, 32) = 672

Step 2

Convert to Equivalent Fractions with Common Denominator 672

Multiply the numerator and denominator of 15/21 by 32, and multiply the numerator and denominator of 23/32 by 21 so both fractions share the common base 672.

15 × 32/21 × 32 = 480/672 and 23 × 21/32 × 21 = 483/672

Step 3

Add the Numerators

Now add the numerators (480 + 483 = 963) and keep the common denominator 672 unchanged.

480 + 483/672 = 963/672

Step 4

Simplify the Fraction to Lowest Terms

Find the Greatest Common Divisor (GCD) of 963 and 672, which is 3. Divide both the numerator and denominator by 3.

963 ÷ 3/672 ÷ 3 = 321/224

Step 5

Convert Improper Fraction to a Mixed Number

Since the numerator (321) is greater than the denominator (224), divide 321 by 224: it goes in 1 whole time(s) with a remainder of 97, giving the mixed number 1 97/224.

321/224 = 197/224

Step 6

Decimal & Percentage Representation

Dividing the numerator 321 by denominator 224 produces a repeating decimal (approximately 1.433036, or 143.3036%).

321 ÷ 224 = 1.433036 (143.3036%)

Visual Representation

The diagram below illustrates 15/21 plus 23/32 visually:

Summary & Alternative Representations

Property / Format	Value
Lowest Terms Fraction	`321/224`
Mixed Number Form	`1 97/224`
Decimal Form	`1.433036`
Percentage	`143.3036%`

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Frequently Asked Questions

What is 15/21 plus 23/32 as a fraction?

15/21 + 23/32 in simplest fraction form is 321/224 (or 1 97/224 as a mixed number).

What is 15/21 plus 23/32 as a decimal?

15/21 + 23/32 converted to a decimal is 1.433036.

What is 15/21 plus 23/32 as a percentage?

15/21 + 23/32 expressed as a percentage is 143.3036%.

How do you write 15/21 plus 23/32 as a mixed number?

Because the numerator is greater than the denominator, the improper fraction 321/224 can be written as the mixed number 1 97/224.

Does 15/21 plus 23/32 result in a terminating or repeating decimal?

It results in a repeating decimal (approximately 1.433036...) because the denominator contains prime factors other than 2 and 5.