What is 2/8 plus 9/18? (Answer: 3/4)

Exact Answer

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Problem: What is 2/8 plus 9/18?
Formula / Expression: 2/8 + 9/18
Final Answer: 3/4
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Step-by-Step Solution:

Step 1: Find the Least Common Denominator (LCD)
The denominators 8 and 18 share a common factor (GCD = 2). Finding their Least Common Multiple gives an LCD of 72 (which is smaller than their product 8 × 18 = 144, keeping the calculation simpler).
Working: LCD(8, 18) = 72

Step 2: Convert to Equivalent Fractions with Common Denominator 72
Multiply the numerator and denominator of 2/8 by 9, and multiply the numerator and denominator of 9/18 by 4 so both fractions share the common base 72.
Working: 2 × 9/8 × 9 = 18/72 and 9 × 4/18 × 4 = 36/72

Step 3: Add the Numerators
Now add the numerators (18 + 36 = 54) and keep the common denominator 72 unchanged.
Working: 18 + 36/72 = 54/72

Step 4: Simplify the Fraction to Lowest Terms
Find the Greatest Common Divisor (GCD) of 54 and 72, which is 18. Divide both the numerator and denominator by 18.
Working: 54 ÷ 18/72 ÷ 18 = 3/4

Step 5: Decimal & Percentage Representation
Dividing the numerator 3 by denominator 4 yields an exact terminating decimal of 0.75 (or 75%).
Working: 3 ÷ 4 = 0.75 (75%)

Key Values:
- Simplified Fraction: 3/4
- Mixed Number Form: 3/4
- Decimal Value: 0.75
- Percentage: 75%

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Solved with FractionsCalc:
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2/8 + 9/18 = 3/4

Simplified Fraction

3/4

Mixed Number

Proper (3/4)

Decimal Value

0.75

Percentage

75%

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Step-by-Step Solution: 2/8 + 9/18

Step 1

Find the Least Common Denominator (LCD)

The denominators 8 and 18 share a common factor (GCD = 2). Finding their Least Common Multiple gives an LCD of 72 (which is smaller than their product 8 × 18 = 144, keeping the calculation simpler).

LCD(8, 18) = 72

Step 2

Convert to Equivalent Fractions with Common Denominator 72

Multiply the numerator and denominator of 2/8 by 9, and multiply the numerator and denominator of 9/18 by 4 so both fractions share the common base 72.

2 × 9/8 × 9 = 18/72 and 9 × 4/18 × 4 = 36/72

Step 3

Add the Numerators

Now add the numerators (18 + 36 = 54) and keep the common denominator 72 unchanged.

18 + 36/72 = 54/72

Step 4

Simplify the Fraction to Lowest Terms

Find the Greatest Common Divisor (GCD) of 54 and 72, which is 18. Divide both the numerator and denominator by 18.

54 ÷ 18/72 ÷ 18 = 3/4

Step 5

Decimal & Percentage Representation

Dividing the numerator 3 by denominator 4 yields an exact terminating decimal of 0.75 (or 75%).

3 ÷ 4 = 0.75 (75%)

Visual Representation

The diagram below illustrates 2/8 plus 9/18 visually:

Summary & Alternative Representations

Property / Format	Value
Lowest Terms Fraction	`3/4`
Mixed Number Form	`3/4`
Decimal Form	`0.75`
Percentage	`75%`

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Frequently Asked Questions

What is 2/8 plus 9/18 as a fraction?

2/8 + 9/18 in simplest fraction form is 3/4.

What is 2/8 plus 9/18 as a decimal?

2/8 + 9/18 converted to a decimal is 0.75.

What is 2/8 plus 9/18 as a percentage?

2/8 + 9/18 expressed as a percentage is 75%.

Does 2/8 plus 9/18 result in a terminating or repeating decimal?

It results in an exact terminating decimal (0.75) because the denominator in simplest terms contains only prime factors 2 and/or 5.