What is 2/11 plus 9/20? (Answer: 139/220)

Exact Answer

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Problem: What is 2/11 plus 9/20?
Formula / Expression: 2/11 + 9/20
Final Answer: 139/220
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Step-by-Step Solution:

Step 1: Find the Least Common Denominator (LCD)
The denominators 11 and 20 are coprime (they share no common factors other than 1). Therefore, their Least Common Denominator (LCD) is simply their direct product: 11 × 20 = 220.
Working: LCD(11, 20) = 220

Step 2: Convert to Equivalent Fractions with Common Denominator 220
Multiply the numerator and denominator of 2/11 by 20, and multiply the numerator and denominator of 9/20 by 11 so both fractions share the common base 220.
Working: 2 × 20/11 × 20 = 40/220 and 9 × 11/20 × 11 = 99/220

Step 3: Add the Numerators
Now add the numerators (40 + 99 = 139) and keep the common denominator 220 unchanged.
Working: 40 + 99/220 = 139/220

Step 4: Check if the Fraction Can Be Simplified
The Greatest Common Divisor (GCD) of 139 and 220 is 1, confirming that 139/220 cannot be reduced further—it is already in its simplest irreducible form.
Working: 139/220

Step 5: Decimal & Percentage Representation
Dividing the numerator 139 by denominator 220 produces a repeating decimal (approximately 0.631818, or 63.1818%).
Working: 139 ÷ 220 = 0.631818 (63.1818%)

Key Values:
- Simplified Fraction: 139/220
- Mixed Number Form: 139/220
- Decimal Value: 0.631818
- Percentage: 63.1818%

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Solved with FractionsCalc:
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2/11 + 9/20 = 139/220

Simplified Fraction

139/220

Mixed Number

Proper (139/220)

Decimal Value

0.631818

Percentage

63.1818%

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Step-by-Step Solution: 2/11 + 9/20

Step 1

Find the Least Common Denominator (LCD)

The denominators 11 and 20 are coprime (they share no common factors other than 1). Therefore, their Least Common Denominator (LCD) is simply their direct product: 11 × 20 = 220.

LCD(11, 20) = 220

Step 2

Convert to Equivalent Fractions with Common Denominator 220

Multiply the numerator and denominator of 2/11 by 20, and multiply the numerator and denominator of 9/20 by 11 so both fractions share the common base 220.

2 × 20/11 × 20 = 40/220 and 9 × 11/20 × 11 = 99/220

Step 3

Add the Numerators

Now add the numerators (40 + 99 = 139) and keep the common denominator 220 unchanged.

40 + 99/220 = 139/220

Step 4

Check if the Fraction Can Be Simplified

The Greatest Common Divisor (GCD) of 139 and 220 is 1, confirming that 139/220 cannot be reduced further—it is already in its simplest irreducible form.

139/220

Step 5

Decimal & Percentage Representation

Dividing the numerator 139 by denominator 220 produces a repeating decimal (approximately 0.631818, or 63.1818%).

139 ÷ 220 = 0.631818 (63.1818%)

Visual Representation

The diagram below illustrates 2/11 plus 9/20 visually:

Summary & Alternative Representations

Property / Format	Value
Lowest Terms Fraction	`139/220`
Mixed Number Form	`139/220`
Decimal Form	`0.631818`
Percentage	`63.1818%`

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Frequently Asked Questions

What is 2/11 plus 9/20 as a fraction?

2/11 + 9/20 in simplest fraction form is 139/220.

What is 2/11 plus 9/20 as a decimal?

2/11 + 9/20 converted to a decimal is 0.631818.

What is 2/11 plus 9/20 as a percentage?

2/11 + 9/20 expressed as a percentage is 63.1818%.

Does 2/11 plus 9/20 result in a terminating or repeating decimal?

It results in a repeating decimal (approximately 0.631818...) because the denominator contains prime factors other than 2 and 5.