Subtract 42/90 from 15/35
15/35 - 42/90 is -4/105.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 35 and 90 is 630
Next, find the equivalent fraction of both fractional numbers with denominator 630 - For the 1st fraction, since 35 × 18 = 630,
15/35 = 15 × 18/35 × 18 = 270/630 - Likewise, for the 2nd fraction, since 90 × 7 = 630,
42/90 = 42 × 7/90 × 7 = 294/630 - Subtract the two like fractions:
270/630 - 294/630 = 270 - 294/630 = -24/630 - After reducing the fraction, the answer is -4/105
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