What is 3/7 plus 8/10? (Answer: 43/35)

Exact Answer

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Problem: What is 3/7 plus 8/10?
Formula / Expression: 3/7 + 8/10
Final Answer: 1 8/35 (43/35)
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Step-by-Step Solution:

Step 1: Find the Least Common Denominator (LCD)
The denominators 7 and 10 are coprime (they share no common factors other than 1). Therefore, their Least Common Denominator (LCD) is simply their direct product: 7 × 10 = 70.
Working: LCD(7, 10) = 70

Step 2: Convert to Equivalent Fractions with Common Denominator 70
Multiply the numerator and denominator of 3/7 by 10, and multiply the numerator and denominator of 8/10 by 7 so both fractions share the common base 70.
Working: 3 × 10/7 × 10 = 30/70 and 8 × 7/10 × 7 = 56/70

Step 3: Add the Numerators
Now add the numerators (30 + 56 = 86) and keep the common denominator 70 unchanged.
Working: 30 + 56/70 = 86/70

Step 4: Simplify the Fraction to Lowest Terms
Find the Greatest Common Divisor (GCD) of 86 and 70, which is 2. Divide both the numerator and denominator by 2.
Working: 86 ÷ 2/70 ÷ 2 = 43/35

Step 5: Convert Improper Fraction to a Mixed Number
Since the numerator (43) is greater than the denominator (35), divide 43 by 35: it goes in 1 whole time(s) with a remainder of 8, giving the mixed number 1 8/35.
Working: 43/35 = 1 8/35

Step 6: Decimal & Percentage Representation
Dividing the numerator 43 by denominator 35 produces a repeating decimal (approximately 1.228571, or 122.8571%).
Working: 43 ÷ 35 = 1.228571 (122.8571%)

Key Values:
- Simplified Fraction: 43/35
- Mixed Number Form: 1 8/35
- Decimal Value: 1.228571
- Percentage: 122.8571%

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Solved with FractionsCalc:
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3/7 + 8/10 = 43/35

Simplified Fraction

43/35

Mixed Number

1 8/35

Decimal Value

1.228571

Percentage

122.8571%

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Step-by-Step Solution: 3/7 + 8/10

Step 1

Find the Least Common Denominator (LCD)

The denominators 7 and 10 are coprime (they share no common factors other than 1). Therefore, their Least Common Denominator (LCD) is simply their direct product: 7 × 10 = 70.

LCD(7, 10) = 70

Step 2

Convert to Equivalent Fractions with Common Denominator 70

Multiply the numerator and denominator of 3/7 by 10, and multiply the numerator and denominator of 8/10 by 7 so both fractions share the common base 70.

3 × 10/7 × 10 = 30/70 and 8 × 7/10 × 7 = 56/70

Step 3

Add the Numerators

Now add the numerators (30 + 56 = 86) and keep the common denominator 70 unchanged.

30 + 56/70 = 86/70

Step 4

Simplify the Fraction to Lowest Terms

Find the Greatest Common Divisor (GCD) of 86 and 70, which is 2. Divide both the numerator and denominator by 2.

86 ÷ 2/70 ÷ 2 = 43/35

Step 5

Convert Improper Fraction to a Mixed Number

Since the numerator (43) is greater than the denominator (35), divide 43 by 35: it goes in 1 whole time(s) with a remainder of 8, giving the mixed number 1 8/35.

43/35 = 18/35

Step 6

Decimal & Percentage Representation

Dividing the numerator 43 by denominator 35 produces a repeating decimal (approximately 1.228571, or 122.8571%).

43 ÷ 35 = 1.228571 (122.8571%)

Visual Representation

The diagram below illustrates 3/7 plus 8/10 visually:

Summary & Alternative Representations

Property / Format	Value
Lowest Terms Fraction	`43/35`
Mixed Number Form	`1 8/35`
Decimal Form	`1.228571`
Percentage	`122.8571%`

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Frequently Asked Questions

What is 3/7 plus 8/10 as a fraction?

3/7 + 8/10 in simplest fraction form is 43/35 (or 1 8/35 as a mixed number).

What is 3/7 plus 8/10 as a decimal?

3/7 + 8/10 converted to a decimal is 1.228571.

What is 3/7 plus 8/10 as a percentage?

3/7 + 8/10 expressed as a percentage is 122.8571%.

How do you write 3/7 plus 8/10 as a mixed number?

Because the numerator is greater than the denominator, the improper fraction 43/35 can be written as the mixed number 1 8/35.

Does 3/7 plus 8/10 result in a terminating or repeating decimal?

It results in a repeating decimal (approximately 1.228571...) because the denominator contains prime factors other than 2 and 5.