Answers

Subtract 28/20 from 70/80

1^st number: 70/80, 2^nd number: 1 8/20

70/80 - 28/20 is -21/40.

Steps for subtracting fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 80 and 20 is 80
   
   Next, find the equivalent fraction of both fractional numbers with denominator 80
2. For the 1st fraction, since 80 × 1 = 80,
   70/80 = 70 × 1/80 × 1 = 70/80
3. Likewise, for the 2nd fraction, since 20 × 4 = 80,
   28/20 = 28 × 4/20 × 4 = 112/80
4. Subtract the two like fractions:
   70/80 - 112/80 = 70 - 112/80 = -42/80
5. After reducing the fraction, the answer is -21/40

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