Answers

Add 90/70 and 20/84

1^st number: 1 20/70, 2^nd number: 20/84

90/70 + 20/84 is 32/21.

Steps for adding fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 70 and 84 is 420
   
   Next, find the equivalent fraction of both fractional numbers with denominator 420
2. For the 1st fraction, since 70 × 6 = 420,
   90/70 = 90 × 6/70 × 6 = 540/420
3. Likewise, for the 2nd fraction, since 84 × 5 = 420,
   20/84 = 20 × 5/84 × 5 = 100/420
4. Add the two like fractions:
   540/420 + 100/420 = 540 + 100/420 = 640/420
5. 640/420 simplified gives 32/21
6. So, 90/70 + 20/84 = 32/21
   In mixed form: 111/21

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