What is 11/27 plus 9/13?
11/27 plus 9/13 equals 386/351 (or 1 35/351 as a mixed number) (or 1.099715 in decimal form). Learn the step-by-step solution to add 11/27 and 9/13 using Least Common Denominator and simplification.
Exact Answer
11/27 + 9/13 = 386/351
Simplified Fraction
386/351
Mixed Number
1 35/351
Decimal Value
1.099715
Percentage
109.9715%
Step-by-Step Solution: 11/27 + 9/13
Step 1
Find the Least Common Denominator (LCD)
The denominators 27 and 13 are coprime (they share no common factors other than 1). Therefore, their Least Common Denominator (LCD) is simply their direct product: 27 × 13 = 351.
LCD(27, 13) = 351
Step 2
Convert to Equivalent Fractions with Common Denominator 351
Multiply the numerator and denominator of 11/27 by 13, and multiply the numerator and denominator of 9/13 by 27 so both fractions share the common base 351.
11 × 13/27 × 13 = 143/351 and 9 × 27/13 × 27 = 243/351
Step 3
Add the Numerators
Now add the numerators (143 + 243 = 386) and keep the common denominator 351 unchanged.
143 + 243/351 = 386/351
Step 4
Check if the Fraction Can Be Simplified
The Greatest Common Divisor (GCD) of 386 and 351 is 1, confirming that 386/351 cannot be reduced further—it is already in its simplest irreducible form.
386/351
Step 5
Convert Improper Fraction to a Mixed Number
Since the numerator (386) is greater than the denominator (351), divide 386 by 351: it goes in 1 whole time(s) with a remainder of 35, giving the mixed number 1 35/351.
386/351 = 135/351
Step 6
Decimal & Percentage Representation
Dividing the numerator 386 by denominator 351 produces a repeating decimal (approximately 1.099715, or 109.9715%).
386 ÷ 351 = 1.099715 (109.9715%)
Visual Representation
The diagram below illustrates 11/27 plus 9/13 visually:
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Summary & Alternative Representations
| Property / Format | Value |
|---|---|
| Lowest Terms Fraction | 386/351 |
| Mixed Number Form | 1 35/351 |
| Decimal Form | 1.099715 |
| Percentage | 109.9715% |
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Frequently Asked Questions
What is 11/27 plus 9/13 as a fraction?
11/27 + 9/13 in simplest fraction form is 386/351 (or 1 35/351 as a mixed number).
What is 11/27 plus 9/13 as a decimal?
11/27 + 9/13 converted to a decimal is 1.099715.
What is 11/27 plus 9/13 as a percentage?
11/27 + 9/13 expressed as a percentage is 109.9715%.
How do you write 11/27 plus 9/13 as a mixed number?
Because the numerator is greater than the denominator, the improper fraction 386/351 can be written as the mixed number 1 35/351.
Does 11/27 plus 9/13 result in a terminating or repeating decimal?
It results in a repeating decimal (approximately 1.099715...) because the denominator contains prime factors other than 2 and 5.