Answers

Subtract 21/20 from 90/24

1^st number: 3 18/24, 2^nd number: 1 1/20

90/24 - 21/20 is 27/10.

Steps for subtracting fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 24 and 20 is 120
   
   Next, find the equivalent fraction of both fractional numbers with denominator 120
2. For the 1st fraction, since 24 × 5 = 120,
   90/24 = 90 × 5/24 × 5 = 450/120
3. Likewise, for the 2nd fraction, since 20 × 6 = 120,
   21/20 = 21 × 6/20 × 6 = 126/120
4. Subtract the two like fractions:
   450/120 - 126/120 = 450 - 126/120 = 324/120
5. After reducing the fraction, the answer is 27/10
6. In mixed form: 27/10

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