What is 15/41 plus 10/21?
15/41 plus 10/21 equals 725/861 (or 0.842044 in decimal form). Learn the step-by-step solution to add 15/41 and 10/21 using Least Common Denominator and simplification.
Exact Answer
15/41 + 10/21 = 725/861
Simplified Fraction
725/861
Mixed Number
Proper (725/861)
Decimal Value
0.842044
Percentage
84.2044%
Step-by-Step Solution: 15/41 + 10/21
Step 1
Find the Least Common Denominator (LCD)
The denominators 41 and 21 are coprime (they share no common factors other than 1). Therefore, their Least Common Denominator (LCD) is simply their direct product: 41 × 21 = 861.
LCD(41, 21) = 861
Step 2
Convert to Equivalent Fractions with Common Denominator 861
Multiply the numerator and denominator of 15/41 by 21, and multiply the numerator and denominator of 10/21 by 41 so both fractions share the common base 861.
15 × 21/41 × 21 = 315/861 and 10 × 41/21 × 41 = 410/861
Step 3
Add the Numerators
Now add the numerators (315 + 410 = 725) and keep the common denominator 861 unchanged.
315 + 410/861 = 725/861
Step 4
Check if the Fraction Can Be Simplified
The Greatest Common Divisor (GCD) of 725 and 861 is 1, confirming that 725/861 cannot be reduced further—it is already in its simplest irreducible form.
725/861
Step 5
Decimal & Percentage Representation
Dividing the numerator 725 by denominator 861 produces a repeating decimal (approximately 0.842044, or 84.2044%).
725 ÷ 861 = 0.842044 (84.2044%)
Visual Representation
The diagram below illustrates 15/41 plus 10/21 visually:
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Summary & Alternative Representations
| Property / Format | Value |
|---|---|
| Lowest Terms Fraction | 725/861 |
| Mixed Number Form | 725/861 |
| Decimal Form | 0.842044 |
| Percentage | 84.2044% |
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Frequently Asked Questions
What is 15/41 plus 10/21 as a fraction?
15/41 + 10/21 in simplest fraction form is 725/861.
What is 15/41 plus 10/21 as a decimal?
15/41 + 10/21 converted to a decimal is 0.842044.
What is 15/41 plus 10/21 as a percentage?
15/41 + 10/21 expressed as a percentage is 84.2044%.
Does 15/41 plus 10/21 result in a terminating or repeating decimal?
It results in a repeating decimal (approximately 0.842044...) because the denominator contains prime factors other than 2 and 5.