Subtract 15/18 from 42/70
42/70 - 15/18 is -7/30.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 70 and 18 is 630
Next, find the equivalent fraction of both fractional numbers with denominator 630 - For the 1st fraction, since 70 × 9 = 630,
42/70 = 42 × 9/70 × 9 = 378/630 - Likewise, for the 2nd fraction, since 18 × 35 = 630,
15/18 = 15 × 35/18 × 35 = 525/630 - Subtract the two like fractions:
378/630 - 525/630 = 378 - 525/630 = -147/630 - After reducing the fraction, the answer is -7/30
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