Answers

Add 75/70 and 21/90

1^st number: 1 5/70, 2^nd number: 21/90

75/70 + 21/90 is 137/105.

Steps for adding fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 70 and 90 is 630
   
   Next, find the equivalent fraction of both fractional numbers with denominator 630
2. For the 1st fraction, since 70 × 9 = 630,
   75/70 = 75 × 9/70 × 9 = 675/630
3. Likewise, for the 2nd fraction, since 90 × 7 = 630,
   21/90 = 21 × 7/90 × 7 = 147/630
4. Add the two like fractions:
   675/630 + 147/630 = 675 + 147/630 = 822/630
5. 822/630 simplified gives 137/105
6. So, 75/70 + 21/90 = 137/105
   In mixed form: 132/105

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