Subtract 9/30 from 40/20, Solve 2 0/20

Subtract 9/30 from 40/20

1^st number: 2 0/20, 2^nd number: 9/30

40/20 - 9/30 is 17/10.

Find the least common denominator or LCM of the two denominators:
LCM of 20 and 30 is 60

Next, find the equivalent fraction of both fractional numbers with denominator 60
For the 1st fraction, since 20 × 3 = 60,
40/20 = 40 × 3/20 × 3 = 120/60
Likewise, for the 2nd fraction, since 30 × 2 = 60,
9/30 = 9 × 2/30 × 2 = 18/60
Subtract the two like fractions:
120/60 - 18/60 = 120 - 18/60 = 102/60
After reducing the fraction, the answer is 17/10
In mixed form: 17/10

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