What is 10/21 plus 18/37? (Answer: 748/777)

Exact Answer

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Problem: What is 10/21 plus 18/37?
Formula / Expression: 10/21 + 18/37
Final Answer: 748/777
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Step-by-Step Solution:

Step 1: Find the Least Common Denominator (LCD)
The denominators 21 and 37 are coprime (they share no common factors other than 1). Therefore, their Least Common Denominator (LCD) is simply their direct product: 21 × 37 = 777.
Working: LCD(21, 37) = 777

Step 2: Convert to Equivalent Fractions with Common Denominator 777
Multiply the numerator and denominator of 10/21 by 37, and multiply the numerator and denominator of 18/37 by 21 so both fractions share the common base 777.
Working: 10 × 37/21 × 37 = 370/777 and 18 × 21/37 × 21 = 378/777

Step 3: Add the Numerators
Now add the numerators (370 + 378 = 748) and keep the common denominator 777 unchanged.
Working: 370 + 378/777 = 748/777

Step 4: Check if the Fraction Can Be Simplified
The Greatest Common Divisor (GCD) of 748 and 777 is 1, confirming that 748/777 cannot be reduced further—it is already in its simplest irreducible form.
Working: 748/777

Step 5: Decimal & Percentage Representation
Dividing the numerator 748 by denominator 777 produces a repeating decimal (approximately 0.962677, or 96.2677%).
Working: 748 ÷ 777 = 0.962677 (96.2677%)

Key Values:
- Simplified Fraction: 748/777
- Mixed Number Form: 748/777
- Decimal Value: 0.962677
- Percentage: 96.2677%

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Solved with FractionsCalc:
https://fractionscalc.com/what-is-10-21-plus-18-37/
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10/21 + 18/37 = 748/777

Simplified Fraction

748/777

Mixed Number

Proper (748/777)

Decimal Value

0.962677

Percentage

96.2677%

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Step-by-Step Solution: 10/21 + 18/37

Step 1

Find the Least Common Denominator (LCD)

The denominators 21 and 37 are coprime (they share no common factors other than 1). Therefore, their Least Common Denominator (LCD) is simply their direct product: 21 × 37 = 777.

LCD(21, 37) = 777

Step 2

Convert to Equivalent Fractions with Common Denominator 777

Multiply the numerator and denominator of 10/21 by 37, and multiply the numerator and denominator of 18/37 by 21 so both fractions share the common base 777.

10 × 37/21 × 37 = 370/777 and 18 × 21/37 × 21 = 378/777

Step 3

Add the Numerators

Now add the numerators (370 + 378 = 748) and keep the common denominator 777 unchanged.

370 + 378/777 = 748/777

Step 4

Check if the Fraction Can Be Simplified

The Greatest Common Divisor (GCD) of 748 and 777 is 1, confirming that 748/777 cannot be reduced further—it is already in its simplest irreducible form.

748/777

Step 5

Decimal & Percentage Representation

Dividing the numerator 748 by denominator 777 produces a repeating decimal (approximately 0.962677, or 96.2677%).

748 ÷ 777 = 0.962677 (96.2677%)

Visual Representation

The diagram below illustrates 10/21 plus 18/37 visually:

Summary & Alternative Representations

Property / Format	Value
Lowest Terms Fraction	`748/777`
Mixed Number Form	`748/777`
Decimal Form	`0.962677`
Percentage	`96.2677%`

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Frequently Asked Questions

What is 10/21 plus 18/37 as a fraction?

10/21 + 18/37 in simplest fraction form is 748/777.

What is 10/21 plus 18/37 as a decimal?

10/21 + 18/37 converted to a decimal is 0.962677.

What is 10/21 plus 18/37 as a percentage?

10/21 + 18/37 expressed as a percentage is 96.2677%.

Does 10/21 plus 18/37 result in a terminating or repeating decimal?

It results in a repeating decimal (approximately 0.962677...) because the denominator contains prime factors other than 2 and 5.