Answers

Add 90/84 and 70/40

1^st number: 1 6/84, 2^nd number: 1 30/40

90/84 + 70/40 is 79/28.

Steps for adding fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 84 and 40 is 840
   
   Next, find the equivalent fraction of both fractional numbers with denominator 840
2. For the 1st fraction, since 84 × 10 = 840,
   90/84 = 90 × 10/84 × 10 = 900/840
3. Likewise, for the 2nd fraction, since 40 × 21 = 840,
   70/40 = 70 × 21/40 × 21 = 1470/840
4. Add the two like fractions:
   900/840 + 1470/840 = 900 + 1470/840 = 2370/840
5. 2370/840 simplified gives 79/28
6. So, 90/84 + 70/40 = 79/28
   In mixed form: 223/28

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