Subtract 1/42 from 15/90
15/90 - 1/42 is 1/7.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 90 and 42 is 630
Next, find the equivalent fraction of both fractional numbers with denominator 630 - For the 1st fraction, since 90 × 7 = 630,
15/90 = 15 × 7/90 × 7 = 105/630 - Likewise, for the 2nd fraction, since 42 × 15 = 630,
1/42 = 1 × 15/42 × 15 = 15/630 - Subtract the two like fractions:
105/630 - 15/630 = 105 - 15/630 = 90/630 - After reducing the fraction, the answer is 1/7
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