Answers

Subtract 63/40 from 28/90

1^st number: 28/90, 2^nd number: 1 23/40

28/90 - 63/40 is -91/72.

Steps for subtracting fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 90 and 40 is 360
   
   Next, find the equivalent fraction of both fractional numbers with denominator 360
2. For the 1st fraction, since 90 × 4 = 360,
   28/90 = 28 × 4/90 × 4 = 112/360
3. Likewise, for the 2nd fraction, since 40 × 9 = 360,
   63/40 = 63 × 9/40 × 9 = 567/360
4. Subtract the two like fractions:
   112/360 - 567/360 = 112 - 567/360 = -455/360
5. After reducing the fraction, the answer is -91/72

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