Subtract 40/21 from 15/4
1st number: 3 3/4, 2nd number: 1 19/21
15/4 - 40/21 is 155/84.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 4 and 21 is 84
Next, find the equivalent fraction of both fractional numbers with denominator 84 - For the 1st fraction, since 4 × 21 = 84,
15/4 = 15 × 21/4 × 21 = 315/84 - Likewise, for the 2nd fraction, since 21 × 4 = 84,
40/21 = 40 × 4/21 × 4 = 160/84 - Subtract the two like fractions:
315/84 - 160/84 = 315 - 160/84 = 155/84 - In mixed form: 171/84
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