Subtract 15/42 from 49/20, Solve 2 9/20

Subtract 15/42 from 49/20

1^st number: 2 9/20, 2^nd number: 15/42

49/20 - 15/42 is 293/140.

Find the least common denominator or LCM of the two denominators:
LCM of 20 and 42 is 420

Next, find the equivalent fraction of both fractional numbers with denominator 420
For the 1st fraction, since 20 × 21 = 420,
49/20 = 49 × 21/20 × 21 = 1029/420
Likewise, for the 2nd fraction, since 42 × 10 = 420,
15/42 = 15 × 10/42 × 10 = 150/420
Subtract the two like fractions:
1029/420 - 150/420 = 1029 - 150/420 = 879/420
After reducing the fraction, the answer is 293/140
In mixed form: 213/140

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