Subtract 42/40 from 9/4, Solve 2 1/4

Subtract 42/40 from 9/4

1^st number: 2 1/4, 2^nd number: 1 2/40

9/4 - 42/40 is 6/5.

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,
42/40 = 42 × 1/40 × 1 = 42/40
Subtract the two like fractions:
90/40 - 42/40 = 90 - 42/40 = 48/40
After reducing the fraction, the answer is 6/5
In mixed form: 11/5

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