Answers

Subtract 18/72 from 28/20

1^st number: 1 8/20, 2^nd number: 18/72

28/20 - 18/72 is 23/20.

Steps for subtracting fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 20 and 72 is 360
   
   Next, find the equivalent fraction of both fractional numbers with denominator 360
2. For the 1st fraction, since 20 × 18 = 360,
   28/20 = 28 × 18/20 × 18 = 504/360
3. Likewise, for the 2nd fraction, since 72 × 5 = 360,
   18/72 = 18 × 5/72 × 5 = 90/360
4. Subtract the two like fractions:
   504/360 - 90/360 = 504 - 90/360 = 414/360
5. After reducing the fraction, the answer is 23/20
6. In mixed form: 13/20

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