Answers

Subtract 21/20 from 90/25

1^st number: 3 15/25, 2^nd number: 1 1/20

90/25 - 21/20 is 51/20.

Steps for subtracting fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 25 and 20 is 100
   
   Next, find the equivalent fraction of both fractional numbers with denominator 100
2. For the 1st fraction, since 25 × 4 = 100,
   90/25 = 90 × 4/25 × 4 = 360/100
3. Likewise, for the 2nd fraction, since 20 × 5 = 100,
   21/20 = 21 × 5/20 × 5 = 105/100
4. Subtract the two like fractions:
   360/100 - 105/100 = 360 - 105/100 = 255/100
5. After reducing the fraction, the answer is 51/20
6. In mixed form: 211/20

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