What is 3/18 plus 2/5? (Answer: 17/30)

Exact Answer

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Problem: What is 3/18 plus 2/5?
Formula / Expression: 3/18 + 2/5
Final Answer: 17/30
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Step-by-Step Solution:

Step 1: Find the Least Common Denominator (LCD)
The denominators 18 and 5 are coprime (they share no common factors other than 1). Therefore, their Least Common Denominator (LCD) is simply their direct product: 18 × 5 = 90.
Working: LCD(18, 5) = 90

Step 2: Convert to Equivalent Fractions with Common Denominator 90
Multiply the numerator and denominator of 3/18 by 5, and multiply the numerator and denominator of 2/5 by 18 so both fractions share the common base 90.
Working: 3 × 5/18 × 5 = 15/90 and 2 × 18/5 × 18 = 36/90

Step 3: Add the Numerators
Now add the numerators (15 + 36 = 51) and keep the common denominator 90 unchanged.
Working: 15 + 36/90 = 51/90

Step 4: Simplify the Fraction to Lowest Terms
Find the Greatest Common Divisor (GCD) of 51 and 90, which is 3. Divide both the numerator and denominator by 3.
Working: 51 ÷ 3/90 ÷ 3 = 17/30

Step 5: Decimal & Percentage Representation
Dividing the numerator 17 by denominator 30 produces a repeating decimal (approximately 0.566667, or 56.6667%).
Working: 17 ÷ 30 = 0.566667 (56.6667%)

Key Values:
- Simplified Fraction: 17/30
- Mixed Number Form: 17/30
- Decimal Value: 0.566667
- Percentage: 56.6667%

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Solved with FractionsCalc:
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3/18 + 2/5 = 17/30

Simplified Fraction

17/30

Mixed Number

Proper (17/30)

Decimal Value

0.566667

Percentage

56.6667%

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Step-by-Step Solution: 3/18 + 2/5

Step 1

Find the Least Common Denominator (LCD)

The denominators 18 and 5 are coprime (they share no common factors other than 1). Therefore, their Least Common Denominator (LCD) is simply their direct product: 18 × 5 = 90.

LCD(18, 5) = 90

Step 2

Convert to Equivalent Fractions with Common Denominator 90

Multiply the numerator and denominator of 3/18 by 5, and multiply the numerator and denominator of 2/5 by 18 so both fractions share the common base 90.

3 × 5/18 × 5 = 15/90 and 2 × 18/5 × 18 = 36/90

Step 3

Add the Numerators

Now add the numerators (15 + 36 = 51) and keep the common denominator 90 unchanged.

15 + 36/90 = 51/90

Step 4

Simplify the Fraction to Lowest Terms

Find the Greatest Common Divisor (GCD) of 51 and 90, which is 3. Divide both the numerator and denominator by 3.

51 ÷ 3/90 ÷ 3 = 17/30

Step 5

Decimal & Percentage Representation

Dividing the numerator 17 by denominator 30 produces a repeating decimal (approximately 0.566667, or 56.6667%).

17 ÷ 30 = 0.566667 (56.6667%)

Visual Representation

The diagram below illustrates 3/18 plus 2/5 visually:

Summary & Alternative Representations

Property / Format	Value
Lowest Terms Fraction	`17/30`
Mixed Number Form	`17/30`
Decimal Form	`0.566667`
Percentage	`56.6667%`

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Frequently Asked Questions

What is 3/18 plus 2/5 as a fraction?

3/18 + 2/5 in simplest fraction form is 17/30.

What is 3/18 plus 2/5 as a decimal?

3/18 + 2/5 converted to a decimal is 0.566667.

What is 3/18 plus 2/5 as a percentage?

3/18 + 2/5 expressed as a percentage is 56.6667%.

Does 3/18 plus 2/5 result in a terminating or repeating decimal?

It results in a repeating decimal (approximately 0.566667...) because the denominator contains prime factors other than 2 and 5.