What is 2/3 plus 8/9?
2/3 plus 8/9 equals 14/9 (or 1 5/9 as a mixed number) (or 1.555556 in decimal form). Learn the step-by-step solution to add 2/3 and 8/9 using Least Common Denominator and simplification.
Exact Answer
2/3 + 8/9 = 14/9
Simplified Fraction
14/9
Mixed Number
1 5/9
Decimal Value
1.555556
Percentage
155.5556%
Step-by-Step Solution: 2/3 + 8/9
Step 1
Find the Least Common Denominator (LCD)
Notice that 9 is an exact multiple of 3 (3 × 3 = 9). The Least Common Denominator (LCD) is simply 9, meaning we only need to scale one fraction.
LCD(3, 9) = 9
Step 2
Convert to Equivalent Fractions with Common Denominator 9
Multiply the numerator and denominator of 2/3 by 3, and multiply the numerator and denominator of 8/9 by 1 so both fractions share the common base 9.
2 × 3/3 × 3 = 6/9 and 8 × 1/9 × 1 = 8/9
Step 3
Add the Numerators
Now add the numerators (6 + 8 = 14) and keep the common denominator 9 unchanged.
6 + 8/9 = 14/9
Step 4
Check if the Fraction Can Be Simplified
The Greatest Common Divisor (GCD) of 14 and 9 is 1, confirming that 14/9 cannot be reduced further—it is already in its simplest irreducible form.
14/9
Step 5
Convert Improper Fraction to a Mixed Number
Since the numerator (14) is greater than the denominator (9), divide 14 by 9: it goes in 1 whole time(s) with a remainder of 5, giving the mixed number 1 5/9.
14/9 = 15/9
Step 6
Decimal & Percentage Representation
Dividing the numerator 14 by denominator 9 produces a repeating decimal (approximately 1.555556, or 155.5556%).
14 ÷ 9 = 1.555556 (155.5556%)
Visual Representation
The diagram below illustrates 2/3 plus 8/9 visually:
+
=
Summary & Alternative Representations
| Property / Format | Value |
|---|---|
| Lowest Terms Fraction | 14/9 |
| Mixed Number Form | 1 5/9 |
| Decimal Form | 1.555556 |
| Percentage | 155.5556% |
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Frequently Asked Questions
What is 2/3 plus 8/9 as a fraction?
2/3 + 8/9 in simplest fraction form is 14/9 (or 1 5/9 as a mixed number).
What is 2/3 plus 8/9 as a decimal?
2/3 + 8/9 converted to a decimal is 1.555556.
What is 2/3 plus 8/9 as a percentage?
2/3 + 8/9 expressed as a percentage is 155.5556%.
How do you write 2/3 plus 8/9 as a mixed number?
Because the numerator is greater than the denominator, the improper fraction 14/9 can be written as the mixed number 1 5/9.
Does 2/3 plus 8/9 result in a terminating or repeating decimal?
It results in a repeating decimal (approximately 1.555556...) because the denominator contains prime factors other than 2 and 5.