Subtract 10/4 from 72/45, Solve 1 27/45

Subtract 10/4 from 72/45

1^st number: 1 27/45, 2^nd number: 2 2/4

72/45 - 10/4 is -9/10.

Find the least common denominator or LCM of the two denominators:
LCM of 45 and 4 is 180

Next, find the equivalent fraction of both fractional numbers with denominator 180
For the 1st fraction, since 45 × 4 = 180,
72/45 = 72 × 4/45 × 4 = 288/180
Likewise, for the 2nd fraction, since 4 × 45 = 180,
10/4 = 10 × 45/4 × 45 = 450/180
Subtract the two like fractions:
288/180 - 450/180 = 288 - 450/180 = -162/180
After reducing the fraction, the answer is -9/10

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