What is 1/9 plus 4/8? (Answer: 11/18)

Exact Answer

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Problem: What is 1/9 plus 4/8?
Formula / Expression: 1/9 + 4/8
Final Answer: 11/18
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Step-by-Step Solution:

Step 1: Find the Least Common Denominator (LCD)
The denominators 9 and 8 are coprime (they share no common factors other than 1). Therefore, their Least Common Denominator (LCD) is simply their direct product: 9 × 8 = 72.
Working: LCD(9, 8) = 72

Step 2: Convert to Equivalent Fractions with Common Denominator 72
Multiply the numerator and denominator of 1/9 by 8, and multiply the numerator and denominator of 4/8 by 9 so both fractions share the common base 72.
Working: 1 × 8/9 × 8 = 8/72 and 4 × 9/8 × 9 = 36/72

Step 3: Add the Numerators
Now add the numerators (8 + 36 = 44) and keep the common denominator 72 unchanged.
Working: 8 + 36/72 = 44/72

Step 4: Simplify the Fraction to Lowest Terms
Find the Greatest Common Divisor (GCD) of 44 and 72, which is 4. Divide both the numerator and denominator by 4.
Working: 44 ÷ 4/72 ÷ 4 = 11/18

Step 5: Decimal & Percentage Representation
Dividing the numerator 11 by denominator 18 produces a repeating decimal (approximately 0.611111, or 61.1111%).
Working: 11 ÷ 18 = 0.611111 (61.1111%)

Key Values:
- Simplified Fraction: 11/18
- Mixed Number Form: 11/18
- Decimal Value: 0.611111
- Percentage: 61.1111%

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Solved with FractionsCalc:
https://fractionscalc.com/what-is-1-9-plus-4-8/
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1/9 + 4/8 = 11/18

Simplified Fraction

11/18

Mixed Number

Proper (11/18)

Decimal Value

0.611111

Percentage

61.1111%

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Step-by-Step Solution: 1/9 + 4/8

Step 1

Find the Least Common Denominator (LCD)

The denominators 9 and 8 are coprime (they share no common factors other than 1). Therefore, their Least Common Denominator (LCD) is simply their direct product: 9 × 8 = 72.

LCD(9, 8) = 72

Step 2

Convert to Equivalent Fractions with Common Denominator 72

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

1 × 8/9 × 8 = 8/72 and 4 × 9/8 × 9 = 36/72

Step 3

Add the Numerators

Now add the numerators (8 + 36 = 44) and keep the common denominator 72 unchanged.

8 + 36/72 = 44/72

Step 4

Simplify the Fraction to Lowest Terms

Find the Greatest Common Divisor (GCD) of 44 and 72, which is 4. Divide both the numerator and denominator by 4.

44 ÷ 4/72 ÷ 4 = 11/18

Step 5

Decimal & Percentage Representation

Dividing the numerator 11 by denominator 18 produces a repeating decimal (approximately 0.611111, or 61.1111%).

11 ÷ 18 = 0.611111 (61.1111%)

Visual Representation

The diagram below illustrates 1/9 plus 4/8 visually:

Summary & Alternative Representations

Property / Format	Value
Lowest Terms Fraction	`11/18`
Mixed Number Form	`11/18`
Decimal Form	`0.611111`
Percentage	`61.1111%`

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Frequently Asked Questions

What is 1/9 plus 4/8 as a fraction?

1/9 + 4/8 in simplest fraction form is 11/18.

What is 1/9 plus 4/8 as a decimal?

1/9 + 4/8 converted to a decimal is 0.611111.

What is 1/9 plus 4/8 as a percentage?

1/9 + 4/8 expressed as a percentage is 61.1111%.

Does 1/9 plus 4/8 result in a terminating or repeating decimal?

It results in a repeating decimal (approximately 0.611111...) because the denominator contains prime factors other than 2 and 5.