What is 3/8 plus 9/16? (Answer: 15/16)

Exact Answer

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Problem: What is 3/8 plus 9/16?
Formula / Expression: 3/8 + 9/16
Final Answer: 15/16
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Step-by-Step Solution:

Step 1: Find the Least Common Denominator (LCD)
Notice that 16 is an exact multiple of 8 (8 × 2 = 16). The Least Common Denominator (LCD) is simply 16, meaning we only need to scale one fraction.
Working: LCD(8, 16) = 16

Step 2: Convert to Equivalent Fractions with Common Denominator 16
Multiply the numerator and denominator of 3/8 by 2, and multiply the numerator and denominator of 9/16 by 1 so both fractions share the common base 16.
Working: 3 × 2/8 × 2 = 6/16 and 9 × 1/16 × 1 = 9/16

Step 3: Add the Numerators
Now add the numerators (6 + 9 = 15) and keep the common denominator 16 unchanged.
Working: 6 + 9/16 = 15/16

Step 4: Check if the Fraction Can Be Simplified
The Greatest Common Divisor (GCD) of 15 and 16 is 1, confirming that 15/16 cannot be reduced further—it is already in its simplest irreducible form.
Working: 15/16

Step 5: Decimal & Percentage Representation
Dividing the numerator 15 by denominator 16 yields an exact terminating decimal of 0.9375 (or 93.75%).
Working: 15 ÷ 16 = 0.9375 (93.75%)

Key Values:
- Simplified Fraction: 15/16
- Mixed Number Form: 15/16
- Decimal Value: 0.9375
- Percentage: 93.75%

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3/8 + 9/16 = 15/16

Simplified Fraction

15/16

Mixed Number

Proper (15/16)

Decimal Value

0.9375

Percentage

93.75%

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Step-by-Step Solution: 3/8 + 9/16

Step 1

Find the Least Common Denominator (LCD)

Notice that 16 is an exact multiple of 8 (8 × 2 = 16). The Least Common Denominator (LCD) is simply 16, meaning we only need to scale one fraction.

LCD(8, 16) = 16

Step 2

Convert to Equivalent Fractions with Common Denominator 16

Multiply the numerator and denominator of 3/8 by 2, and multiply the numerator and denominator of 9/16 by 1 so both fractions share the common base 16.

3 × 2/8 × 2 = 6/16 and 9 × 1/16 × 1 = 9/16

Step 3

Add the Numerators

Now add the numerators (6 + 9 = 15) and keep the common denominator 16 unchanged.

6 + 9/16 = 15/16

Step 4

Check if the Fraction Can Be Simplified

The Greatest Common Divisor (GCD) of 15 and 16 is 1, confirming that 15/16 cannot be reduced further—it is already in its simplest irreducible form.

15/16

Step 5

Decimal & Percentage Representation

Dividing the numerator 15 by denominator 16 yields an exact terminating decimal of 0.9375 (or 93.75%).

15 ÷ 16 = 0.9375 (93.75%)

Visual Representation

The diagram below illustrates 3/8 plus 9/16 visually:

Summary & Alternative Representations

Property / Format	Value
Lowest Terms Fraction	`15/16`
Mixed Number Form	`15/16`
Decimal Form	`0.9375`
Percentage	`93.75%`

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Frequently Asked Questions

What is 3/8 plus 9/16 as a fraction?

3/8 + 9/16 in simplest fraction form is 15/16.

What is 3/8 plus 9/16 as a decimal?

3/8 + 9/16 converted to a decimal is 0.9375.

What is 3/8 plus 9/16 as a percentage?

3/8 + 9/16 expressed as a percentage is 93.75%.

Does 3/8 plus 9/16 result in a terminating or repeating decimal?

It results in an exact terminating decimal (0.9375) because the denominator in simplest terms contains only prime factors 2 and/or 5.