Subtract 42/40 from 4/9, Solve 4/9 - 1 2/40 as a fraction

Subtract 42/40 from 4/9

1^st number: 4/9, 2^nd number: 1 2/40

4/9 - 42/40 is -109/180.

Find the least common denominator or LCM of the two denominators:
LCM of 9 and 40 is 360

Next, find the equivalent fraction of both fractional numbers with denominator 360
For the 1st fraction, since 9 × 40 = 360,
4/9 = 4 × 40/9 × 40 = 160/360
Likewise, for the 2nd fraction, since 40 × 9 = 360,
42/40 = 42 × 9/40 × 9 = 378/360
Subtract the two like fractions:
160/360 - 378/360 = 160 - 378/360 = -218/360
After reducing the fraction, the answer is -109/180

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