What is 4/7 plus 9/12? (Answer: 37/28)

Exact Answer

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Problem: What is 4/7 plus 9/12?
Formula / Expression: 4/7 + 9/12
Final Answer: 1 9/28 (37/28)
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Step-by-Step Solution:

Step 1: Find the Least Common Denominator (LCD)
The denominators 7 and 12 are coprime (they share no common factors other than 1). Therefore, their Least Common Denominator (LCD) is simply their direct product: 7 × 12 = 84.
Working: LCD(7, 12) = 84

Step 2: Convert to Equivalent Fractions with Common Denominator 84
Multiply the numerator and denominator of 4/7 by 12, and multiply the numerator and denominator of 9/12 by 7 so both fractions share the common base 84.
Working: 4 × 12/7 × 12 = 48/84 and 9 × 7/12 × 7 = 63/84

Step 3: Add the Numerators
Now add the numerators (48 + 63 = 111) and keep the common denominator 84 unchanged.
Working: 48 + 63/84 = 111/84

Step 4: Simplify the Fraction to Lowest Terms
Find the Greatest Common Divisor (GCD) of 111 and 84, which is 3. Divide both the numerator and denominator by 3.
Working: 111 ÷ 3/84 ÷ 3 = 37/28

Step 5: Convert Improper Fraction to a Mixed Number
Since the numerator (37) is greater than the denominator (28), divide 37 by 28: it goes in 1 whole time(s) with a remainder of 9, giving the mixed number 1 9/28.
Working: 37/28 = 1 9/28

Step 6: Decimal & Percentage Representation
Dividing the numerator 37 by denominator 28 produces a repeating decimal (approximately 1.321429, or 132.1429%).
Working: 37 ÷ 28 = 1.321429 (132.1429%)

Key Values:
- Simplified Fraction: 37/28
- Mixed Number Form: 1 9/28
- Decimal Value: 1.321429
- Percentage: 132.1429%

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Solved with FractionsCalc:
https://fractionscalc.com/what-is-4-7-plus-9-12/
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4/7 + 9/12 = 37/28

Simplified Fraction

37/28

Mixed Number

1 9/28

Decimal Value

1.321429

Percentage

132.1429%

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Step-by-Step Solution: 4/7 + 9/12

Step 1

Find the Least Common Denominator (LCD)

The denominators 7 and 12 are coprime (they share no common factors other than 1). Therefore, their Least Common Denominator (LCD) is simply their direct product: 7 × 12 = 84.

LCD(7, 12) = 84

Step 2

Convert to Equivalent Fractions with Common Denominator 84

Multiply the numerator and denominator of 4/7 by 12, and multiply the numerator and denominator of 9/12 by 7 so both fractions share the common base 84.

4 × 12/7 × 12 = 48/84 and 9 × 7/12 × 7 = 63/84

Step 3

Add the Numerators

Now add the numerators (48 + 63 = 111) and keep the common denominator 84 unchanged.

48 + 63/84 = 111/84

Step 4

Simplify the Fraction to Lowest Terms

Find the Greatest Common Divisor (GCD) of 111 and 84, which is 3. Divide both the numerator and denominator by 3.

111 ÷ 3/84 ÷ 3 = 37/28

Step 5

Convert Improper Fraction to a Mixed Number

Since the numerator (37) is greater than the denominator (28), divide 37 by 28: it goes in 1 whole time(s) with a remainder of 9, giving the mixed number 1 9/28.

37/28 = 19/28

Step 6

Decimal & Percentage Representation

Dividing the numerator 37 by denominator 28 produces a repeating decimal (approximately 1.321429, or 132.1429%).

37 ÷ 28 = 1.321429 (132.1429%)

Visual Representation

The diagram below illustrates 4/7 plus 9/12 visually:

Summary & Alternative Representations

Property / Format	Value
Lowest Terms Fraction	`37/28`
Mixed Number Form	`1 9/28`
Decimal Form	`1.321429`
Percentage	`132.1429%`

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Frequently Asked Questions

What is 4/7 plus 9/12 as a fraction?

4/7 + 9/12 in simplest fraction form is 37/28 (or 1 9/28 as a mixed number).

What is 4/7 plus 9/12 as a decimal?

4/7 + 9/12 converted to a decimal is 1.321429.

What is 4/7 plus 9/12 as a percentage?

4/7 + 9/12 expressed as a percentage is 132.1429%.

How do you write 4/7 plus 9/12 as a mixed number?

Because the numerator is greater than the denominator, the improper fraction 37/28 can be written as the mixed number 1 9/28.

Does 4/7 plus 9/12 result in a terminating or repeating decimal?

It results in a repeating decimal (approximately 1.321429...) because the denominator contains prime factors other than 2 and 5.