What is 18/34 plus 7/13? (Answer: 236/221)

Exact Answer

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Problem: What is 18/34 plus 7/13?
Formula / Expression: 18/34 + 7/13
Final Answer: 1 15/221 (236/221)
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Step-by-Step Solution:

Step 1: Find the Least Common Denominator (LCD)
The denominators 34 and 13 are coprime (they share no common factors other than 1). Therefore, their Least Common Denominator (LCD) is simply their direct product: 34 × 13 = 442.
Working: LCD(34, 13) = 442

Step 2: Convert to Equivalent Fractions with Common Denominator 442
Multiply the numerator and denominator of 18/34 by 13, and multiply the numerator and denominator of 7/13 by 34 so both fractions share the common base 442.
Working: 18 × 13/34 × 13 = 234/442 and 7 × 34/13 × 34 = 238/442

Step 3: Add the Numerators
Now add the numerators (234 + 238 = 472) and keep the common denominator 442 unchanged.
Working: 234 + 238/442 = 472/442

Step 4: Simplify the Fraction to Lowest Terms
Find the Greatest Common Divisor (GCD) of 472 and 442, which is 2. Divide both the numerator and denominator by 2.
Working: 472 ÷ 2/442 ÷ 2 = 236/221

Step 5: Convert Improper Fraction to a Mixed Number
Since the numerator (236) is greater than the denominator (221), divide 236 by 221: it goes in 1 whole time(s) with a remainder of 15, giving the mixed number 1 15/221.
Working: 236/221 = 1 15/221

Step 6: Decimal & Percentage Representation
Dividing the numerator 236 by denominator 221 produces a repeating decimal (approximately 1.067873, or 106.7873%).
Working: 236 ÷ 221 = 1.067873 (106.7873%)

Key Values:
- Simplified Fraction: 236/221
- Mixed Number Form: 1 15/221
- Decimal Value: 1.067873
- Percentage: 106.7873%

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Solved with FractionsCalc:
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18/34 + 7/13 = 236/221

Simplified Fraction

236/221

Mixed Number

1 15/221

Decimal Value

1.067873

Percentage

106.7873%

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Step-by-Step Solution: 18/34 + 7/13

Step 1

Find the Least Common Denominator (LCD)

The denominators 34 and 13 are coprime (they share no common factors other than 1). Therefore, their Least Common Denominator (LCD) is simply their direct product: 34 × 13 = 442.

LCD(34, 13) = 442

Step 2

Convert to Equivalent Fractions with Common Denominator 442

Multiply the numerator and denominator of 18/34 by 13, and multiply the numerator and denominator of 7/13 by 34 so both fractions share the common base 442.

18 × 13/34 × 13 = 234/442 and 7 × 34/13 × 34 = 238/442

Step 3

Add the Numerators

Now add the numerators (234 + 238 = 472) and keep the common denominator 442 unchanged.

234 + 238/442 = 472/442

Step 4

Simplify the Fraction to Lowest Terms

Find the Greatest Common Divisor (GCD) of 472 and 442, which is 2. Divide both the numerator and denominator by 2.

472 ÷ 2/442 ÷ 2 = 236/221

Step 5

Convert Improper Fraction to a Mixed Number

Since the numerator (236) is greater than the denominator (221), divide 236 by 221: it goes in 1 whole time(s) with a remainder of 15, giving the mixed number 1 15/221.

236/221 = 115/221

Step 6

Decimal & Percentage Representation

Dividing the numerator 236 by denominator 221 produces a repeating decimal (approximately 1.067873, or 106.7873%).

236 ÷ 221 = 1.067873 (106.7873%)

Visual Representation

The diagram below illustrates 18/34 plus 7/13 visually:

Summary & Alternative Representations

Property / Format	Value
Lowest Terms Fraction	`236/221`
Mixed Number Form	`1 15/221`
Decimal Form	`1.067873`
Percentage	`106.7873%`

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Frequently Asked Questions

What is 18/34 plus 7/13 as a fraction?

18/34 + 7/13 in simplest fraction form is 236/221 (or 1 15/221 as a mixed number).

What is 18/34 plus 7/13 as a decimal?

18/34 + 7/13 converted to a decimal is 1.067873.

What is 18/34 plus 7/13 as a percentage?

18/34 + 7/13 expressed as a percentage is 106.7873%.

How do you write 18/34 plus 7/13 as a mixed number?

Because the numerator is greater than the denominator, the improper fraction 236/221 can be written as the mixed number 1 15/221.

Does 18/34 plus 7/13 result in a terminating or repeating decimal?

It results in a repeating decimal (approximately 1.067873...) because the denominator contains prime factors other than 2 and 5.