Subtract 21/40 from 9/4
1st number: 2 1/4, 2nd number: 21/40
9/4 - 21/40 is 69/40.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 4 and 40 is 40
Next, find the equivalent fraction of both fractional numbers with denominator 40 - For the 1st fraction, since 4 × 10 = 40,
9/4 = 9 × 10/4 × 10 = 90/40 - Likewise, for the 2nd fraction, since 40 × 1 = 40,
21/40 = 21 × 1/40 × 1 = 21/40 - Subtract the two like fractions:
90/40 - 21/40 = 90 - 21/40 = 69/40 - In mixed form: 129/40
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