Answers

Add 84/70 and 28/72

1^st number: 1 14/70, 2^nd number: 28/72

84/70 + 28/72 is 143/90.

Steps for adding fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 70 and 72 is 2520
   
   Next, find the equivalent fraction of both fractional numbers with denominator 2520
2. For the 1st fraction, since 70 × 36 = 2520,
   84/70 = 84 × 36/70 × 36 = 3024/2520
3. Likewise, for the 2nd fraction, since 72 × 35 = 2520,
   28/72 = 28 × 35/72 × 35 = 980/2520
4. Add the two like fractions:
   3024/2520 + 980/2520 = 3024 + 980/2520 = 4004/2520
5. 4004/2520 simplified gives 143/90
6. So, 84/70 + 28/72 = 143/90
   In mixed form: 153/90

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