Answers

Add 70/90 and 54/21

1^st number: 70/90, 2^nd number: 2 12/21

70/90 + 54/21 is 211/63.

Steps for adding fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 90 and 21 is 630
   
   Next, find the equivalent fraction of both fractional numbers with denominator 630
2. For the 1st fraction, since 90 × 7 = 630,
   70/90 = 70 × 7/90 × 7 = 490/630
3. Likewise, for the 2nd fraction, since 21 × 30 = 630,
   54/21 = 54 × 30/21 × 30 = 1620/630
4. Add the two like fractions:
   490/630 + 1620/630 = 490 + 1620/630 = 2110/630
5. 2110/630 simplified gives 211/63
6. So, 70/90 + 54/21 = 211/63
   In mixed form: 322/63

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