Answers

Add 72/80 and 60/21

1^st number: 72/80, 2^nd number: 2 18/21

72/80 + 60/21 is 263/70.

Steps for adding fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 80 and 21 is 1680
   
   Next, find the equivalent fraction of both fractional numbers with denominator 1680
2. For the 1st fraction, since 80 × 21 = 1680,
   72/80 = 72 × 21/80 × 21 = 1512/1680
3. Likewise, for the 2nd fraction, since 21 × 80 = 1680,
   60/21 = 60 × 80/21 × 80 = 4800/1680
4. Add the two like fractions:
   1512/1680 + 4800/1680 = 1512 + 4800/1680 = 6312/1680
5. 6312/1680 simplified gives 263/70
6. So, 72/80 + 60/21 = 263/70
   In mixed form: 353/70

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