Subtract 98/9 from 90/40, Solve 2 10/40

Subtract 98/9 from 90/40

1^st number: 2 10/40, 2^nd number: 10 8/9

90/40 - 98/9 is -311/36.

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

Next, find the equivalent fraction of both fractional numbers with denominator 360
For the 1st fraction, since 40 × 9 = 360,
90/40 = 90 × 9/40 × 9 = 810/360
Likewise, for the 2nd fraction, since 9 × 40 = 360,
98/9 = 98 × 40/9 × 40 = 3920/360
Subtract the two like fractions:
810/360 - 3920/360 = 810 - 3920/360 = -3110/360
After reducing the fraction, the answer is -311/36

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