Subtract 72/45 from 10/40, Solve 10/40

Subtract 72/45 from 10/40

1^st number: 10/40, 2^nd number: 1 27/45

10/40 - 72/45 is -27/20.

Find the least common denominator or LCM of the two denominators:
LCM of 40 and 45 is 360

Next, find the equivalent fraction of both fractional numbers with denominator 360
For the 1st fraction, since 40 × 9 = 360,
10/40 = 10 × 9/40 × 9 = 90/360
Likewise, for the 2nd fraction, since 45 × 8 = 360,
72/45 = 72 × 8/45 × 8 = 576/360
Subtract the two like fractions:
90/360 - 576/360 = 90 - 576/360 = -486/360
After reducing the fraction, the answer is -27/20

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