What is 1/9 plus 3/9?
1/9 plus 3/9 equals 4/9 (or 0.444444 in decimal form). Learn the step-by-step solution to add 1/9 and 3/9 using Least Common Denominator and simplification.
Exact Answer
1/9 + 3/9 = 4/9
Simplified Fraction
4/9
Mixed Number
Proper (4/9)
Decimal Value
0.444444
Percentage
44.4444%
Step-by-Step Solution: 1/9 + 3/9
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.
1/9 + 3/9
Step 2
Add the Numerators
Now add the numerators (1 + 3 = 4) and keep the common denominator 9 unchanged.
1 + 3/9 = 4/9
Step 3
Check if the Fraction Can Be Simplified
The Greatest Common Divisor (GCD) of 4 and 9 is 1, confirming that 4/9 cannot be reduced further—it is already in its simplest irreducible form.
4/9
Step 4
Decimal & Percentage Representation
Dividing the numerator 4 by denominator 9 produces a repeating decimal (approximately 0.444444, or 44.4444%).
4 ÷ 9 = 0.444444 (44.4444%)
Visual Representation
The diagram below illustrates 1/9 plus 3/9 visually:
+
=
Summary & Alternative Representations
| Property / Format | Value |
|---|---|
| Lowest Terms Fraction | 4/9 |
| Mixed Number Form | 4/9 |
| Decimal Form | 0.444444 |
| Percentage | 44.4444% |
Was this solution helpful?
Help us improve our free step-by-step tools
Frequently Asked Questions
What is 1/9 plus 3/9 as a fraction?
1/9 + 3/9 in simplest fraction form is 4/9.
What is 1/9 plus 3/9 as a decimal?
1/9 + 3/9 converted to a decimal is 0.444444.
What is 1/9 plus 3/9 as a percentage?
1/9 + 3/9 expressed as a percentage is 44.4444%.
Does 1/9 plus 3/9 result in a terminating or repeating decimal?
It results in a repeating decimal (approximately 0.444444...) because the denominator contains prime factors other than 2 and 5.