Subtract 9/20 from 15/9, Solve 1 6/9

Subtract 9/20 from 15/9

1^st number: 1 6/9, 2^nd number: 9/20

15/9 - 9/20 is 73/60.

Find the least common denominator or LCM of the two denominators:
LCM of 9 and 20 is 180

Next, find the equivalent fraction of both fractional numbers with denominator 180
For the 1st fraction, since 9 × 20 = 180,
15/9 = 15 × 20/9 × 20 = 300/180
Likewise, for the 2nd fraction, since 20 × 9 = 180,
9/20 = 9 × 9/20 × 9 = 81/180
Subtract the two like fractions:
300/180 - 81/180 = 300 - 81/180 = 219/180
After reducing the fraction, the answer is 73/60
In mixed form: 113/60

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