What is 2/15 plus 2/5? (Answer: 8/15)

Exact Answer

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Problem: What is 2/15 plus 2/5?
Formula / Expression: 2/15 + 2/5
Final Answer: 8/15
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Step-by-Step Solution:

Step 1: Find the Least Common Denominator (LCD)
Notice that 15 is an exact multiple of 5 (5 × 3 = 15). The Least Common Denominator (LCD) is simply 15, meaning we only need to scale one fraction.
Working: LCD(15, 5) = 15

Step 2: Convert to Equivalent Fractions with Common Denominator 15
Multiply the numerator and denominator of 2/15 by 1, and multiply the numerator and denominator of 2/5 by 3 so both fractions share the common base 15.
Working: 2 × 1/15 × 1 = 2/15 and 2 × 3/5 × 3 = 6/15

Step 3: Add the Numerators
Now add the numerators (2 + 6 = 8) and keep the common denominator 15 unchanged.
Working: 2 + 6/15 = 8/15

Step 4: Check if the Fraction Can Be Simplified
The Greatest Common Divisor (GCD) of 8 and 15 is 1, confirming that 8/15 cannot be reduced further—it is already in its simplest irreducible form.
Working: 8/15

Step 5: Decimal & Percentage Representation
Dividing the numerator 8 by denominator 15 produces a repeating decimal (approximately 0.533333, or 53.3333%).
Working: 8 ÷ 15 = 0.533333 (53.3333%)

Key Values:
- Simplified Fraction: 8/15
- Mixed Number Form: 8/15
- Decimal Value: 0.533333
- Percentage: 53.3333%

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Solved with FractionsCalc:
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2/15 + 2/5 = 8/15

Simplified Fraction

8/15

Mixed Number

Proper (8/15)

Decimal Value

0.533333

Percentage

53.3333%

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Step-by-Step Solution: 2/15 + 2/5

Step 1

Find the Least Common Denominator (LCD)

Notice that 15 is an exact multiple of 5 (5 × 3 = 15). The Least Common Denominator (LCD) is simply 15, meaning we only need to scale one fraction.

LCD(15, 5) = 15

Step 2

Convert to Equivalent Fractions with Common Denominator 15

Multiply the numerator and denominator of 2/15 by 1, and multiply the numerator and denominator of 2/5 by 3 so both fractions share the common base 15.

2 × 1/15 × 1 = 2/15 and 2 × 3/5 × 3 = 6/15

Step 3

Add the Numerators

Now add the numerators (2 + 6 = 8) and keep the common denominator 15 unchanged.

2 + 6/15 = 8/15

Step 4

Check if the Fraction Can Be Simplified

The Greatest Common Divisor (GCD) of 8 and 15 is 1, confirming that 8/15 cannot be reduced further—it is already in its simplest irreducible form.

8/15

Step 5

Decimal & Percentage Representation

Dividing the numerator 8 by denominator 15 produces a repeating decimal (approximately 0.533333, or 53.3333%).

8 ÷ 15 = 0.533333 (53.3333%)

Visual Representation

The diagram below illustrates 2/15 plus 2/5 visually:

Summary & Alternative Representations

Property / Format	Value
Lowest Terms Fraction	`8/15`
Mixed Number Form	`8/15`
Decimal Form	`0.533333`
Percentage	`53.3333%`

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Frequently Asked Questions

What is 2/15 plus 2/5 as a fraction?

2/15 + 2/5 in simplest fraction form is 8/15.

What is 2/15 plus 2/5 as a decimal?

2/15 + 2/5 converted to a decimal is 0.533333.

What is 2/15 plus 2/5 as a percentage?

2/15 + 2/5 expressed as a percentage is 53.3333%.

Does 2/15 plus 2/5 result in a terminating or repeating decimal?

It results in a repeating decimal (approximately 0.533333...) because the denominator contains prime factors other than 2 and 5.