Answers

Add 1/28 and 72/20

1^st number: 1/28, 2^nd number: 3 12/20

1/28 + 72/20 is 509/140.

Steps for adding fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 28 and 20 is 140
   
   Next, find the equivalent fraction of both fractional numbers with denominator 140
2. For the 1st fraction, since 28 × 5 = 140,
   1/28 = 1 × 5/28 × 5 = 5/140
3. Likewise, for the 2nd fraction, since 20 × 7 = 140,
   72/20 = 72 × 7/20 × 7 = 504/140
4. Add the two like fractions:
   5/140 + 504/140 = 5 + 504/140 = 509/140
5. So, 1/28 + 72/20 = 509/140
   In mixed form: 389/140

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