Subtract 42/70 from 90/5
1st number: 18 0/5, 2nd number: 42/70
90/5 - 42/70 is 87/5.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 5 and 70 is 70
Next, find the equivalent fraction of both fractional numbers with denominator 70 - For the 1st fraction, since 5 × 14 = 70,
90/5 = 90 × 14/5 × 14 = 1260/70 - Likewise, for the 2nd fraction, since 70 × 1 = 70,
42/70 = 42 × 1/70 × 1 = 42/70 - Subtract the two like fractions:
1260/70 - 42/70 = 1260 - 42/70 = 1218/70 - After reducing the fraction, the answer is 87/5
- In mixed form: 172/5
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