Answers

Add 70/21 and 20/72

1^st number: 3 7/21, 2^nd number: 20/72

70/21 + 20/72 is 65/18.

Steps for adding fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 21 and 72 is 504
   
   Next, find the equivalent fraction of both fractional numbers with denominator 504
2. For the 1st fraction, since 21 × 24 = 504,
   70/21 = 70 × 24/21 × 24 = 1680/504
3. Likewise, for the 2nd fraction, since 72 × 7 = 504,
   20/72 = 20 × 7/72 × 7 = 140/504
4. Add the two like fractions:
   1680/504 + 140/504 = 1680 + 140/504 = 1820/504
5. 1820/504 simplified gives 65/18
6. So, 70/21 + 20/72 = 65/18
   In mixed form: 311/18

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