Answers

Add 70/45 and 90/84

1^st number: 1 25/45, 2^nd number: 1 6/84

70/45 + 90/84 is 331/126.

Steps for adding fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 45 and 84 is 1260
   
   Next, find the equivalent fraction of both fractional numbers with denominator 1260
2. For the 1st fraction, since 45 × 28 = 1260,
   70/45 = 70 × 28/45 × 28 = 1960/1260
3. Likewise, for the 2nd fraction, since 84 × 15 = 1260,
   90/84 = 90 × 15/84 × 15 = 1350/1260
4. Add the two like fractions:
   1960/1260 + 1350/1260 = 1960 + 1350/1260 = 3310/1260
5. 3310/1260 simplified gives 331/126
6. So, 70/45 + 90/84 = 331/126
   In mixed form: 279/126

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