What is 4/8 plus 9/16? (Answer: 17/16)

Exact Answer

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Problem: What is 4/8 plus 9/16?
Formula / Expression: 4/8 + 9/16
Final Answer: 1 1/16 (17/16)
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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 4/8 by 2, and multiply the numerator and denominator of 9/16 by 1 so both fractions share the common base 16.
Working: 4 × 2/8 × 2 = 8/16 and 9 × 1/16 × 1 = 9/16

Step 3: Add the Numerators
Now add the numerators (8 + 9 = 17) and keep the common denominator 16 unchanged.
Working: 8 + 9/16 = 17/16

Step 4: Check if the Fraction Can Be Simplified
The Greatest Common Divisor (GCD) of 17 and 16 is 1, confirming that 17/16 cannot be reduced further—it is already in its simplest irreducible form.
Working: 17/16

Step 5: Convert Improper Fraction to a Mixed Number
Since the numerator (17) is greater than the denominator (16), divide 17 by 16: it goes in 1 whole time(s) with a remainder of 1, giving the mixed number 1 1/16.
Working: 17/16 = 1 1/16

Step 6: Decimal & Percentage Representation
Dividing the numerator 17 by denominator 16 yields an exact terminating decimal of 1.0625 (or 106.25%).
Working: 17 ÷ 16 = 1.0625 (106.25%)

Key Values:
- Simplified Fraction: 17/16
- Mixed Number Form: 1 1/16
- Decimal Value: 1.0625
- Percentage: 106.25%

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Solved with FractionsCalc:
https://fractionscalc.com/what-is-4-8-plus-9-16/
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4/8 + 9/16 = 17/16

Simplified Fraction

17/16

Mixed Number

1 1/16

Decimal Value

1.0625

Percentage

106.25%

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Step-by-Step Solution: 4/8 + 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 4/8 by 2, and multiply the numerator and denominator of 9/16 by 1 so both fractions share the common base 16.

4 × 2/8 × 2 = 8/16 and 9 × 1/16 × 1 = 9/16

Step 3

Add the Numerators

Now add the numerators (8 + 9 = 17) and keep the common denominator 16 unchanged.

8 + 9/16 = 17/16

Step 4

Check if the Fraction Can Be Simplified

The Greatest Common Divisor (GCD) of 17 and 16 is 1, confirming that 17/16 cannot be reduced further—it is already in its simplest irreducible form.

17/16

Step 5

Convert Improper Fraction to a Mixed Number

Since the numerator (17) is greater than the denominator (16), divide 17 by 16: it goes in 1 whole time(s) with a remainder of 1, giving the mixed number 1 1/16.

17/16 = 11/16

Step 6

Decimal & Percentage Representation

Dividing the numerator 17 by denominator 16 yields an exact terminating decimal of 1.0625 (or 106.25%).

17 ÷ 16 = 1.0625 (106.25%)

Visual Representation

The diagram below illustrates 4/8 plus 9/16 visually:

Summary & Alternative Representations

Property / Format	Value
Lowest Terms Fraction	`17/16`
Mixed Number Form	`1 1/16`
Decimal Form	`1.0625`
Percentage	`106.25%`

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Frequently Asked Questions

What is 4/8 plus 9/16 as a fraction?

4/8 + 9/16 in simplest fraction form is 17/16 (or 1 1/16 as a mixed number).

What is 4/8 plus 9/16 as a decimal?

4/8 + 9/16 converted to a decimal is 1.0625.

What is 4/8 plus 9/16 as a percentage?

4/8 + 9/16 expressed as a percentage is 106.25%.

How do you write 4/8 plus 9/16 as a mixed number?

Because the numerator is greater than the denominator, the improper fraction 17/16 can be written as the mixed number 1 1/16.

Does 4/8 plus 9/16 result in a terminating or repeating decimal?

It results in an exact terminating decimal (1.0625) because the denominator in simplest terms contains only prime factors 2 and/or 5.