What is 3/11 plus 7/9?
3/11 plus 7/9 equals 104/99 (or 1 5/99 as a mixed number) (or 1.050505 in decimal form). Learn the step-by-step solution to add 3/11 and 7/9 using Least Common Denominator and simplification.
Exact Answer
3/11 + 7/9 = 104/99
Simplified Fraction
104/99
Mixed Number
1 5/99
Decimal Value
1.050505
Percentage
105.0505%
Step-by-Step Solution: 3/11 + 7/9
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 7/9 by 11 so both fractions share the common base 99.
3 × 9/11 × 9 = 27/99 and 7 × 11/9 × 11 = 77/99
Step 3
Add the Numerators
Now add the numerators (27 + 77 = 104) and keep the common denominator 99 unchanged.
27 + 77/99 = 104/99
Step 4
Check if the Fraction Can Be Simplified
The Greatest Common Divisor (GCD) of 104 and 99 is 1, confirming that 104/99 cannot be reduced further—it is already in its simplest irreducible form.
104/99
Step 5
Convert Improper Fraction to a Mixed Number
Since the numerator (104) is greater than the denominator (99), divide 104 by 99: it goes in 1 whole time(s) with a remainder of 5, giving the mixed number 1 5/99.
104/99 = 15/99
Step 6
Decimal & Percentage Representation
Dividing the numerator 104 by denominator 99 produces a repeating decimal (approximately 1.050505, or 105.0505%).
104 ÷ 99 = 1.050505 (105.0505%)
Visual Representation
The diagram below illustrates 3/11 plus 7/9 visually:
+
=
Summary & Alternative Representations
| Property / Format | Value |
|---|---|
| Lowest Terms Fraction | 104/99 |
| Mixed Number Form | 1 5/99 |
| Decimal Form | 1.050505 |
| Percentage | 105.0505% |
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Frequently Asked Questions
What is 3/11 plus 7/9 as a fraction?
3/11 + 7/9 in simplest fraction form is 104/99 (or 1 5/99 as a mixed number).
What is 3/11 plus 7/9 as a decimal?
3/11 + 7/9 converted to a decimal is 1.050505.
What is 3/11 plus 7/9 as a percentage?
3/11 + 7/9 expressed as a percentage is 105.0505%.
How do you write 3/11 plus 7/9 as a mixed number?
Because the numerator is greater than the denominator, the improper fraction 104/99 can be written as the mixed number 1 5/99.
Does 3/11 plus 7/9 result in a terminating or repeating decimal?
It results in a repeating decimal (approximately 1.050505...) because the denominator contains prime factors other than 2 and 5.