Subtract 20/42 from 72/15
1st number: 4 12/15, 2nd number: 20/42
72/15 - 20/42 is 454/105.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 15 and 42 is 210
Next, find the equivalent fraction of both fractional numbers with denominator 210 - For the 1st fraction, since 15 × 14 = 210,
72/15 = 72 × 14/15 × 14 = 1008/210 - Likewise, for the 2nd fraction, since 42 × 5 = 210,
20/42 = 20 × 5/42 × 5 = 100/210 - Subtract the two like fractions:
1008/210 - 100/210 = 1008 - 100/210 = 908/210 - After reducing the fraction, the answer is 454/105
- In mixed form: 434/105
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