Answers

Add 90/70 and 21/18

1^st number: 1 20/70, 2^nd number: 1 3/18

90/70 + 21/18 is 103/42.

Steps for adding fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 70 and 18 is 630
   
   Next, find the equivalent fraction of both fractional numbers with denominator 630
2. For the 1st fraction, since 70 × 9 = 630,
   90/70 = 90 × 9/70 × 9 = 810/630
3. Likewise, for the 2nd fraction, since 18 × 35 = 630,
   21/18 = 21 × 35/18 × 35 = 735/630
4. Add the two like fractions:
   810/630 + 735/630 = 810 + 735/630 = 1545/630
5. 1545/630 simplified gives 103/42
6. So, 90/70 + 21/18 = 103/42
   In mixed form: 219/42

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