Answers

Add 70/21 and 56/20

1^st number: 3 7/21, 2^nd number: 2 16/20

70/21 + 56/20 is 92/15.

Steps for adding fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 21 and 20 is 420
   
   Next, find the equivalent fraction of both fractional numbers with denominator 420
2. For the 1st fraction, since 21 × 20 = 420,
   70/21 = 70 × 20/21 × 20 = 1400/420
3. Likewise, for the 2nd fraction, since 20 × 21 = 420,
   56/20 = 56 × 21/20 × 21 = 1176/420
4. Add the two like fractions:
   1400/420 + 1176/420 = 1400 + 1176/420 = 2576/420
5. 2576/420 simplified gives 92/15
6. So, 70/21 + 56/20 = 92/15
   In mixed form: 62/15

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