Answers

Subtract 21/90 from 80/20

1^st number: 4 0/20, 2^nd number: 21/90

80/20 - 21/90 is 113/30.

Steps for subtracting fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 20 and 90 is 180
   
   Next, find the equivalent fraction of both fractional numbers with denominator 180
2. For the 1st fraction, since 20 × 9 = 180,
   80/20 = 80 × 9/20 × 9 = 720/180
3. Likewise, for the 2nd fraction, since 90 × 2 = 180,
   21/90 = 21 × 2/90 × 2 = 42/180
4. Subtract the two like fractions:
   720/180 - 42/180 = 720 - 42/180 = 678/180
5. After reducing the fraction, the answer is 113/30
6. In mixed form: 323/30

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