What is 9/18 plus 3/5? (Answer: 11/10)

Exact Answer

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Problem: What is 9/18 plus 3/5?
Formula / Expression: 9/18 + 3/5
Final Answer: 1 1/10 (11/10)
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Step-by-Step Solution:

Step 1: Find the Least Common Denominator (LCD)
The denominators 18 and 5 are coprime (they share no common factors other than 1). Therefore, their Least Common Denominator (LCD) is simply their direct product: 18 × 5 = 90.
Working: LCD(18, 5) = 90

Step 2: Convert to Equivalent Fractions with Common Denominator 90
Multiply the numerator and denominator of 9/18 by 5, and multiply the numerator and denominator of 3/5 by 18 so both fractions share the common base 90.
Working: 9 × 5/18 × 5 = 45/90 and 3 × 18/5 × 18 = 54/90

Step 3: Add the Numerators
Now add the numerators (45 + 54 = 99) and keep the common denominator 90 unchanged.
Working: 45 + 54/90 = 99/90

Step 4: Simplify the Fraction to Lowest Terms
Find the Greatest Common Divisor (GCD) of 99 and 90, which is 9. Divide both the numerator and denominator by 9.
Working: 99 ÷ 9/90 ÷ 9 = 11/10

Step 5: Convert Improper Fraction to a Mixed Number
Since the numerator (11) is greater than the denominator (10), divide 11 by 10: it goes in 1 whole time(s) with a remainder of 1, giving the mixed number 1 1/10.
Working: 11/10 = 1 1/10

Step 6: Decimal & Percentage Representation
Dividing the numerator 11 by denominator 10 yields an exact terminating decimal of 1.1 (or 110%).
Working: 11 ÷ 10 = 1.1 (110%)

Key Values:
- Simplified Fraction: 11/10
- Mixed Number Form: 1 1/10
- Decimal Value: 1.1
- Percentage: 110%

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9/18 + 3/5 = 11/10

Simplified Fraction

11/10

Mixed Number

1 1/10

Decimal Value

1.1

Percentage

110%

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Step-by-Step Solution: 9/18 + 3/5

Step 1

Find the Least Common Denominator (LCD)

The denominators 18 and 5 are coprime (they share no common factors other than 1). Therefore, their Least Common Denominator (LCD) is simply their direct product: 18 × 5 = 90.

LCD(18, 5) = 90

Step 2

Convert to Equivalent Fractions with Common Denominator 90

Multiply the numerator and denominator of 9/18 by 5, and multiply the numerator and denominator of 3/5 by 18 so both fractions share the common base 90.

9 × 5/18 × 5 = 45/90 and 3 × 18/5 × 18 = 54/90

Step 3

Add the Numerators

Now add the numerators (45 + 54 = 99) and keep the common denominator 90 unchanged.

45 + 54/90 = 99/90

Step 4

Simplify the Fraction to Lowest Terms

Find the Greatest Common Divisor (GCD) of 99 and 90, which is 9. Divide both the numerator and denominator by 9.

99 ÷ 9/90 ÷ 9 = 11/10

Step 5

Convert Improper Fraction to a Mixed Number

Since the numerator (11) is greater than the denominator (10), divide 11 by 10: it goes in 1 whole time(s) with a remainder of 1, giving the mixed number 1 1/10.

11/10 = 11/10

Step 6

Decimal & Percentage Representation

Dividing the numerator 11 by denominator 10 yields an exact terminating decimal of 1.1 (or 110%).

11 ÷ 10 = 1.1 (110%)

Visual Representation

The diagram below illustrates 9/18 plus 3/5 visually:

Summary & Alternative Representations

Property / Format	Value
Lowest Terms Fraction	`11/10`
Mixed Number Form	`1 1/10`
Decimal Form	`1.1`
Percentage	`110%`

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Frequently Asked Questions

What is 9/18 plus 3/5 as a fraction?

9/18 + 3/5 in simplest fraction form is 11/10 (or 1 1/10 as a mixed number).

What is 9/18 plus 3/5 as a decimal?

9/18 + 3/5 converted to a decimal is 1.1.

What is 9/18 plus 3/5 as a percentage?

9/18 + 3/5 expressed as a percentage is 110%.

How do you write 9/18 plus 3/5 as a mixed number?

Because the numerator is greater than the denominator, the improper fraction 11/10 can be written as the mixed number 1 1/10.

Does 9/18 plus 3/5 result in a terminating or repeating decimal?

It results in an exact terminating decimal (1.1) because the denominator in simplest terms contains only prime factors 2 and/or 5.