Answers

Add 80/56 and 15/21

1^st number: 1 24/56, 2^nd number: 15/21

80/56 + 15/21 is 15/7.

Steps for adding fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 56 and 21 is 168
   
   Next, find the equivalent fraction of both fractional numbers with denominator 168
2. For the 1st fraction, since 56 × 3 = 168,
   80/56 = 80 × 3/56 × 3 = 240/168
3. Likewise, for the 2nd fraction, since 21 × 8 = 168,
   15/21 = 15 × 8/21 × 8 = 120/168
4. Add the two like fractions:
   240/168 + 120/168 = 240 + 120/168 = 360/168
5. 360/168 simplified gives 15/7
6. So, 80/56 + 15/21 = 15/7
   In mixed form: 21/7

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