Subtract 49/40 from 7/45, Solve 7/45

Subtract 49/40 from 7/45

1^st number: 7/45, 2^nd number: 1 9/40

7/45 - 49/40 is -77/72.

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

Next, find the equivalent fraction of both fractional numbers with denominator 360
For the 1st fraction, since 45 × 8 = 360,
7/45 = 7 × 8/45 × 8 = 56/360
Likewise, for the 2nd fraction, since 40 × 9 = 360,
49/40 = 49 × 9/40 × 9 = 441/360
Subtract the two like fractions:
56/360 - 441/360 = 56 - 441/360 = -385/360
After reducing the fraction, the answer is -77/72

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