What is 7/30 plus 10/13? (Answer: 391/390)

Exact Answer

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Problem: What is 7/30 plus 10/13?
Formula / Expression: 7/30 + 10/13
Final Answer: 1 1/390 (391/390)
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Step-by-Step Solution:

Step 1: Find the Least Common Denominator (LCD)
The denominators 30 and 13 are coprime (they share no common factors other than 1). Therefore, their Least Common Denominator (LCD) is simply their direct product: 30 × 13 = 390.
Working: LCD(30, 13) = 390

Step 2: Convert to Equivalent Fractions with Common Denominator 390
Multiply the numerator and denominator of 7/30 by 13, and multiply the numerator and denominator of 10/13 by 30 so both fractions share the common base 390.
Working: 7 × 13/30 × 13 = 91/390 and 10 × 30/13 × 30 = 300/390

Step 3: Add the Numerators
Now add the numerators (91 + 300 = 391) and keep the common denominator 390 unchanged.
Working: 91 + 300/390 = 391/390

Step 4: Check if the Fraction Can Be Simplified
The Greatest Common Divisor (GCD) of 391 and 390 is 1, confirming that 391/390 cannot be reduced further—it is already in its simplest irreducible form.
Working: 391/390

Step 5: Convert Improper Fraction to a Mixed Number
Since the numerator (391) is greater than the denominator (390), divide 391 by 390: it goes in 1 whole time(s) with a remainder of 1, giving the mixed number 1 1/390.
Working: 391/390 = 1 1/390

Step 6: Decimal & Percentage Representation
Dividing the numerator 391 by denominator 390 produces a repeating decimal (approximately 1.002564, or 100.2564%).
Working: 391 ÷ 390 = 1.002564 (100.2564%)

Key Values:
- Simplified Fraction: 391/390
- Mixed Number Form: 1 1/390
- Decimal Value: 1.002564
- Percentage: 100.2564%

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Solved with FractionsCalc:
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7/30 + 10/13 = 391/390

Simplified Fraction

391/390

Mixed Number

1 1/390

Decimal Value

1.002564

Percentage

100.2564%

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Step-by-Step Solution: 7/30 + 10/13

Step 1

Find the Least Common Denominator (LCD)

The denominators 30 and 13 are coprime (they share no common factors other than 1). Therefore, their Least Common Denominator (LCD) is simply their direct product: 30 × 13 = 390.

LCD(30, 13) = 390

Step 2

Convert to Equivalent Fractions with Common Denominator 390

Multiply the numerator and denominator of 7/30 by 13, and multiply the numerator and denominator of 10/13 by 30 so both fractions share the common base 390.

7 × 13/30 × 13 = 91/390 and 10 × 30/13 × 30 = 300/390

Step 3

Add the Numerators

Now add the numerators (91 + 300 = 391) and keep the common denominator 390 unchanged.

91 + 300/390 = 391/390

Step 4

Check if the Fraction Can Be Simplified

The Greatest Common Divisor (GCD) of 391 and 390 is 1, confirming that 391/390 cannot be reduced further—it is already in its simplest irreducible form.

391/390

Step 5

Convert Improper Fraction to a Mixed Number

Since the numerator (391) is greater than the denominator (390), divide 391 by 390: it goes in 1 whole time(s) with a remainder of 1, giving the mixed number 1 1/390.

391/390 = 11/390

Step 6

Decimal & Percentage Representation

Dividing the numerator 391 by denominator 390 produces a repeating decimal (approximately 1.002564, or 100.2564%).

391 ÷ 390 = 1.002564 (100.2564%)

Visual Representation

The diagram below illustrates 7/30 plus 10/13 visually:

Summary & Alternative Representations

Property / Format	Value
Lowest Terms Fraction	`391/390`
Mixed Number Form	`1 1/390`
Decimal Form	`1.002564`
Percentage	`100.2564%`

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Frequently Asked Questions

What is 7/30 plus 10/13 as a fraction?

7/30 + 10/13 in simplest fraction form is 391/390 (or 1 1/390 as a mixed number).

What is 7/30 plus 10/13 as a decimal?

7/30 + 10/13 converted to a decimal is 1.002564.

What is 7/30 plus 10/13 as a percentage?

7/30 + 10/13 expressed as a percentage is 100.2564%.

How do you write 7/30 plus 10/13 as a mixed number?

Because the numerator is greater than the denominator, the improper fraction 391/390 can be written as the mixed number 1 1/390.

Does 7/30 plus 10/13 result in a terminating or repeating decimal?

It results in a repeating decimal (approximately 1.002564...) because the denominator contains prime factors other than 2 and 5.