Subtract 80/42 from 40/35, Solve 1 5/35

Subtract 80/42 from 40/35

1^st number: 1 5/35, 2^nd number: 1 38/42

40/35 - 80/42 is -16/21.

Find the least common denominator or LCM of the two denominators:
LCM of 35 and 42 is 210

Next, find the equivalent fraction of both fractional numbers with denominator 210
For the 1st fraction, since 35 × 6 = 210,
40/35 = 40 × 6/35 × 6 = 240/210
Likewise, for the 2nd fraction, since 42 × 5 = 210,
80/42 = 80 × 5/42 × 5 = 400/210
Subtract the two like fractions:
240/210 - 400/210 = 240 - 400/210 = -160/210
After reducing the fraction, the answer is -16/21

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