Subtract 15/42 from 70/40
1st number: 1 30/40, 2nd number: 15/42
70/40 - 15/42 is 39/28.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 40 and 42 is 840
Next, find the equivalent fraction of both fractional numbers with denominator 840 - For the 1st fraction, since 40 × 21 = 840,
70/40 = 70 × 21/40 × 21 = 1470/840 - Likewise, for the 2nd fraction, since 42 × 20 = 840,
15/42 = 15 × 20/42 × 20 = 300/840 - Subtract the two like fractions:
1470/840 - 300/840 = 1470 - 300/840 = 1170/840 - After reducing the fraction, the answer is 39/28
- In mixed form: 111/28
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