What is 5/9 plus 4/5?
5/9 plus 4/5 equals 61/45 (or 1 16/45 as a mixed number) (or 1.355556 in decimal form). Learn the step-by-step solution to add 5/9 and 4/5 using Least Common Denominator and simplification.
Exact Answer
5/9 + 4/5 = 61/45
Simplified Fraction
61/45
Mixed Number
1 16/45
Decimal Value
1.355556
Percentage
135.5556%
Step-by-Step Solution: 5/9 + 4/5
Step 1
Find the Least Common Denominator (LCD)
The denominators 9 and 5 are coprime (they share no common factors other than 1). Therefore, their Least Common Denominator (LCD) is simply their direct product: 9 × 5 = 45.
LCD(9, 5) = 45
Step 2
Convert to Equivalent Fractions with Common Denominator 45
Multiply the numerator and denominator of 5/9 by 5, and multiply the numerator and denominator of 4/5 by 9 so both fractions share the common base 45.
5 × 5/9 × 5 = 25/45 and 4 × 9/5 × 9 = 36/45
Step 3
Add the Numerators
Now add the numerators (25 + 36 = 61) and keep the common denominator 45 unchanged.
25 + 36/45 = 61/45
Step 4
Check if the Fraction Can Be Simplified
The Greatest Common Divisor (GCD) of 61 and 45 is 1, confirming that 61/45 cannot be reduced further—it is already in its simplest irreducible form.
61/45
Step 5
Convert Improper Fraction to a Mixed Number
Since the numerator (61) is greater than the denominator (45), divide 61 by 45: it goes in 1 whole time(s) with a remainder of 16, giving the mixed number 1 16/45.
61/45 = 116/45
Step 6
Decimal & Percentage Representation
Dividing the numerator 61 by denominator 45 produces a repeating decimal (approximately 1.355556, or 135.5556%).
61 ÷ 45 = 1.355556 (135.5556%)
Visual Representation
The diagram below illustrates 5/9 plus 4/5 visually:
+
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Summary & Alternative Representations
| Property / Format | Value |
|---|---|
| Lowest Terms Fraction | 61/45 |
| Mixed Number Form | 1 16/45 |
| Decimal Form | 1.355556 |
| Percentage | 135.5556% |
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Frequently Asked Questions
What is 5/9 plus 4/5 as a fraction?
5/9 + 4/5 in simplest fraction form is 61/45 (or 1 16/45 as a mixed number).
What is 5/9 plus 4/5 as a decimal?
5/9 + 4/5 converted to a decimal is 1.355556.
What is 5/9 plus 4/5 as a percentage?
5/9 + 4/5 expressed as a percentage is 135.5556%.
How do you write 5/9 plus 4/5 as a mixed number?
Because the numerator is greater than the denominator, the improper fraction 61/45 can be written as the mixed number 1 16/45.
Does 5/9 plus 4/5 result in a terminating or repeating decimal?
It results in a repeating decimal (approximately 1.355556...) because the denominator contains prime factors other than 2 and 5.