What is 7/9 plus 9/11?
7/9 plus 9/11 equals 158/99 (or 1 59/99 as a mixed number) (or 1.59596 in decimal form). Learn the step-by-step solution to add 7/9 and 9/11 using Least Common Denominator and simplification.
Exact Answer
7/9 + 9/11 = 158/99
Simplified Fraction
158/99
Mixed Number
1 59/99
Decimal Value
1.59596
Percentage
159.596%
Step-by-Step Solution: 7/9 + 9/11
Step 1
Find the Least Common Denominator (LCD)
The denominators 9 and 11 are coprime (they share no common factors other than 1). Therefore, their Least Common Denominator (LCD) is simply their direct product: 9 × 11 = 99.
LCD(9, 11) = 99
Step 2
Convert to Equivalent Fractions with Common Denominator 99
Multiply the numerator and denominator of 7/9 by 11, and multiply the numerator and denominator of 9/11 by 9 so both fractions share the common base 99.
7 × 11/9 × 11 = 77/99 and 9 × 9/11 × 9 = 81/99
Step 3
Add the Numerators
Now add the numerators (77 + 81 = 158) and keep the common denominator 99 unchanged.
77 + 81/99 = 158/99
Step 4
Check if the Fraction Can Be Simplified
The Greatest Common Divisor (GCD) of 158 and 99 is 1, confirming that 158/99 cannot be reduced further—it is already in its simplest irreducible form.
158/99
Step 5
Convert Improper Fraction to a Mixed Number
Since the numerator (158) is greater than the denominator (99), divide 158 by 99: it goes in 1 whole time(s) with a remainder of 59, giving the mixed number 1 59/99.
158/99 = 159/99
Step 6
Decimal & Percentage Representation
Dividing the numerator 158 by denominator 99 produces a repeating decimal (approximately 1.59596, or 159.596%).
158 ÷ 99 = 1.59596 (159.596%)
Visual Representation
The diagram below illustrates 7/9 plus 9/11 visually:
+
=
Summary & Alternative Representations
| Property / Format | Value |
|---|---|
| Lowest Terms Fraction | 158/99 |
| Mixed Number Form | 1 59/99 |
| Decimal Form | 1.59596 |
| Percentage | 159.596% |
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Frequently Asked Questions
What is 7/9 plus 9/11 as a fraction?
7/9 + 9/11 in simplest fraction form is 158/99 (or 1 59/99 as a mixed number).
What is 7/9 plus 9/11 as a decimal?
7/9 + 9/11 converted to a decimal is 1.59596.
What is 7/9 plus 9/11 as a percentage?
7/9 + 9/11 expressed as a percentage is 159.596%.
How do you write 7/9 plus 9/11 as a mixed number?
Because the numerator is greater than the denominator, the improper fraction 158/99 can be written as the mixed number 1 59/99.
Does 7/9 plus 9/11 result in a terminating or repeating decimal?
It results in a repeating decimal (approximately 1.59596...) because the denominator contains prime factors other than 2 and 5.