What is 1/18 plus 2/8? (Answer: 11/36)

Exact Answer

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Problem: What is 1/18 plus 2/8?
Formula / Expression: 1/18 + 2/8
Final Answer: 11/36
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Step-by-Step Solution:

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

Step 2: Convert to Equivalent Fractions with Common Denominator 72
Multiply the numerator and denominator of 1/18 by 4, and multiply the numerator and denominator of 2/8 by 9 so both fractions share the common base 72.
Working: 1 × 4/18 × 4 = 4/72 and 2 × 9/8 × 9 = 18/72

Step 3: Add the Numerators
Now add the numerators (4 + 18 = 22) and keep the common denominator 72 unchanged.
Working: 4 + 18/72 = 22/72

Step 4: Simplify the Fraction to Lowest Terms
Find the Greatest Common Divisor (GCD) of 22 and 72, which is 2. Divide both the numerator and denominator by 2.
Working: 22 ÷ 2/72 ÷ 2 = 11/36

Step 5: Decimal & Percentage Representation
Dividing the numerator 11 by denominator 36 produces a repeating decimal (approximately 0.305556, or 30.5556%).
Working: 11 ÷ 36 = 0.305556 (30.5556%)

Key Values:
- Simplified Fraction: 11/36
- Mixed Number Form: 11/36
- Decimal Value: 0.305556
- Percentage: 30.5556%

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Solved with FractionsCalc:
https://fractionscalc.com/what-is-1-18-plus-2-8/
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1/18 + 2/8 = 11/36

Simplified Fraction

11/36

Mixed Number

Proper (11/36)

Decimal Value

0.305556

Percentage

30.5556%

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Step-by-Step Solution: 1/18 + 2/8

Step 1

Find the Least Common Denominator (LCD)

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

LCD(18, 8) = 72

Step 2

Convert to Equivalent Fractions with Common Denominator 72

Multiply the numerator and denominator of 1/18 by 4, and multiply the numerator and denominator of 2/8 by 9 so both fractions share the common base 72.

1 × 4/18 × 4 = 4/72 and 2 × 9/8 × 9 = 18/72

Step 3

Add the Numerators

Now add the numerators (4 + 18 = 22) and keep the common denominator 72 unchanged.

4 + 18/72 = 22/72

Step 4

Simplify the Fraction to Lowest Terms

Find the Greatest Common Divisor (GCD) of 22 and 72, which is 2. Divide both the numerator and denominator by 2.

22 ÷ 2/72 ÷ 2 = 11/36

Step 5

Decimal & Percentage Representation

Dividing the numerator 11 by denominator 36 produces a repeating decimal (approximately 0.305556, or 30.5556%).

11 ÷ 36 = 0.305556 (30.5556%)

Visual Representation

The diagram below illustrates 1/18 plus 2/8 visually:

Summary & Alternative Representations

Property / Format	Value
Lowest Terms Fraction	`11/36`
Mixed Number Form	`11/36`
Decimal Form	`0.305556`
Percentage	`30.5556%`

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Frequently Asked Questions

What is 1/18 plus 2/8 as a fraction?

1/18 + 2/8 in simplest fraction form is 11/36.

What is 1/18 plus 2/8 as a decimal?

1/18 + 2/8 converted to a decimal is 0.305556.

What is 1/18 plus 2/8 as a percentage?

1/18 + 2/8 expressed as a percentage is 30.5556%.

Does 1/18 plus 2/8 result in a terminating or repeating decimal?

It results in a repeating decimal (approximately 0.305556...) because the denominator contains prime factors other than 2 and 5.