What is 9/59 plus 8/21?
9/59 plus 8/21 equals 661/1239 (or 0.533495 in decimal form). Learn the step-by-step solution to add 9/59 and 8/21 using Least Common Denominator and simplification.
Exact Answer
9/59 + 8/21 = 661/1239
Simplified Fraction
661/1239
Mixed Number
Proper (661/1239)
Decimal Value
0.533495
Percentage
53.3495%
Step-by-Step Solution: 9/59 + 8/21
Step 1
Find the Least Common Denominator (LCD)
The denominators 59 and 21 are coprime (they share no common factors other than 1). Therefore, their Least Common Denominator (LCD) is simply their direct product: 59 × 21 = 1239.
LCD(59, 21) = 1239
Step 2
Convert to Equivalent Fractions with Common Denominator 1239
Multiply the numerator and denominator of 9/59 by 21, and multiply the numerator and denominator of 8/21 by 59 so both fractions share the common base 1239.
9 × 21/59 × 21 = 189/1239 and 8 × 59/21 × 59 = 472/1239
Step 3
Add the Numerators
Now add the numerators (189 + 472 = 661) and keep the common denominator 1239 unchanged.
189 + 472/1239 = 661/1239
Step 4
Check if the Fraction Can Be Simplified
The Greatest Common Divisor (GCD) of 661 and 1239 is 1, confirming that 661/1239 cannot be reduced further—it is already in its simplest irreducible form.
661/1239
Step 5
Decimal & Percentage Representation
Dividing the numerator 661 by denominator 1239 produces a repeating decimal (approximately 0.533495, or 53.3495%).
661 ÷ 1239 = 0.533495 (53.3495%)
Visual Representation
The diagram below illustrates 9/59 plus 8/21 visually:
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Summary & Alternative Representations
| Property / Format | Value |
|---|---|
| Lowest Terms Fraction | 661/1239 |
| Mixed Number Form | 661/1239 |
| Decimal Form | 0.533495 |
| Percentage | 53.3495% |
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Frequently Asked Questions
What is 9/59 plus 8/21 as a fraction?
9/59 + 8/21 in simplest fraction form is 661/1239.
What is 9/59 plus 8/21 as a decimal?
9/59 + 8/21 converted to a decimal is 0.533495.
What is 9/59 plus 8/21 as a percentage?
9/59 + 8/21 expressed as a percentage is 53.3495%.
Does 9/59 plus 8/21 result in a terminating or repeating decimal?
It results in a repeating decimal (approximately 0.533495...) because the denominator contains prime factors other than 2 and 5.