Subtract 45/30 from 9/40, Solve 9/40

Subtract 45/30 from 9/40

1^st number: 9/40, 2^nd number: 1 15/30

9/40 - 45/30 is -51/40.

Find the least common denominator or LCM of the two denominators:
LCM of 40 and 30 is 120

Next, find the equivalent fraction of both fractional numbers with denominator 120
For the 1st fraction, since 40 × 3 = 120,
9/40 = 9 × 3/40 × 3 = 27/120
Likewise, for the 2nd fraction, since 30 × 4 = 120,
45/30 = 45 × 4/30 × 4 = 180/120
Subtract the two like fractions:
27/120 - 180/120 = 27 - 180/120 = -153/120
After reducing the fraction, the answer is -51/40

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