Answers

Add 81/90 and 90/70

1^st number: 81/90, 2^nd number: 1 20/70

81/90 + 90/70 is 153/70.

Steps for adding fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 90 and 70 is 630
   
   Next, find the equivalent fraction of both fractional numbers with denominator 630
2. For the 1st fraction, since 90 × 7 = 630,
   81/90 = 81 × 7/90 × 7 = 567/630
3. Likewise, for the 2nd fraction, since 70 × 9 = 630,
   90/70 = 90 × 9/70 × 9 = 810/630
4. Add the two like fractions:
   567/630 + 810/630 = 567 + 810/630 = 1377/630
5. 1377/630 simplified gives 153/70
6. So, 81/90 + 90/70 = 153/70
   In mixed form: 213/70

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