Answers

Add 90/84 and 15/70

1^st number: 1 6/84, 2^nd number: 15/70

90/84 + 15/70 is 9/7.

Steps for adding fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 84 and 70 is 420
   
   Next, find the equivalent fraction of both fractional numbers with denominator 420
2. For the 1st fraction, since 84 × 5 = 420,
   90/84 = 90 × 5/84 × 5 = 450/420
3. Likewise, for the 2nd fraction, since 70 × 6 = 420,
   15/70 = 15 × 6/70 × 6 = 90/420
4. Add the two like fractions:
   450/420 + 90/420 = 450 + 90/420 = 540/420
5. 540/420 simplified gives 9/7
6. So, 90/84 + 15/70 = 9/7
   In mixed form: 12/7

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