What is 3/11 plus 4/9?
3/11 plus 4/9 equals 71/99 (or 0.717172 in decimal form). Learn the step-by-step solution to add 3/11 and 4/9 using Least Common Denominator and simplification.
Exact Answer
3/11 + 4/9 = 71/99
Simplified Fraction
71/99
Mixed Number
Proper (71/99)
Decimal Value
0.717172
Percentage
71.7172%
Step-by-Step Solution: 3/11 + 4/9
Step 1
Find the Least Common Denominator (LCD)
The denominators 11 and 9 are coprime (they share no common factors other than 1). Therefore, their Least Common Denominator (LCD) is simply their direct product: 11 × 9 = 99.
LCD(11, 9) = 99
Step 2
Convert to Equivalent Fractions with Common Denominator 99
Multiply the numerator and denominator of 3/11 by 9, and multiply the numerator and denominator of 4/9 by 11 so both fractions share the common base 99.
3 × 9/11 × 9 = 27/99 and 4 × 11/9 × 11 = 44/99
Step 3
Add the Numerators
Now add the numerators (27 + 44 = 71) and keep the common denominator 99 unchanged.
27 + 44/99 = 71/99
Step 4
Check if the Fraction Can Be Simplified
The Greatest Common Divisor (GCD) of 71 and 99 is 1, confirming that 71/99 cannot be reduced further—it is already in its simplest irreducible form.
71/99
Step 5
Decimal & Percentage Representation
Dividing the numerator 71 by denominator 99 produces a repeating decimal (approximately 0.717172, or 71.7172%).
71 ÷ 99 = 0.717172 (71.7172%)
Visual Representation
The diagram below illustrates 3/11 plus 4/9 visually:
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Summary & Alternative Representations
| Property / Format | Value |
|---|---|
| Lowest Terms Fraction | 71/99 |
| Mixed Number Form | 71/99 |
| Decimal Form | 0.717172 |
| Percentage | 71.7172% |
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Frequently Asked Questions
What is 3/11 plus 4/9 as a fraction?
3/11 + 4/9 in simplest fraction form is 71/99.
What is 3/11 plus 4/9 as a decimal?
3/11 + 4/9 converted to a decimal is 0.717172.
What is 3/11 plus 4/9 as a percentage?
3/11 + 4/9 expressed as a percentage is 71.7172%.
Does 3/11 plus 4/9 result in a terminating or repeating decimal?
It results in a repeating decimal (approximately 0.717172...) because the denominator contains prime factors other than 2 and 5.