What is 4/9 plus 5/9?
4/9 plus 5/9 equals 1 (or 1 in decimal form). Learn the step-by-step solution to add 4/9 and 5/9 using Least Common Denominator and simplification.
Exact Answer
4/9 + 5/9 = 1
Simplified Fraction
1
Mixed Number
1
Decimal Value
1
Percentage
100%
Step-by-Step Solution: 4/9 + 5/9
Step 1
Check the Denominators (Like Fractions)
Both fractions already share the identical denominator (9). Because these are like fractions, no conversion to a common denominator is required—we directly add their numerators while keeping the denominator 9.
4/9 + 5/9
Step 2
Add the Numerators
Now add the numerators (4 + 5 = 9) and keep the common denominator 9 unchanged.
4 + 5/9 = 9/9
Step 3
Simplify to an Exact Whole Number
Notice that the numerator (9) is completely divisible by the denominator (9). Dividing 9 by 9 yields the whole number 1 with zero remainder.
9/9 = 1
Step 4
Decimal & Percentage Representation
Dividing the numerator 1 by denominator 1 yields an exact terminating decimal of 1 (or 100%).
1 ÷ 1 = 1 (100%)
Visual Representation
The diagram below illustrates 4/9 plus 5/9 visually:
+
=
Summary & Alternative Representations
| Property / Format | Value |
|---|---|
| Lowest Terms Fraction | 1 |
| Mixed Number Form | 1 |
| Decimal Form | 1 |
| Percentage | 100% |
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Frequently Asked Questions
What is 4/9 plus 5/9 as a fraction?
4/9 + 5/9 in simplest fraction form is 1.
What is 4/9 plus 5/9 as a decimal?
4/9 + 5/9 converted to a decimal is 1.
What is 4/9 plus 5/9 as a percentage?
4/9 + 5/9 expressed as a percentage is 100%.
Is the answer to 4/9 plus 5/9 a whole number?
Yes, 4/9 + 5/9 simplifies completely to the whole number 1 with no remaining fractional part.