Answers

Add 90/30 and 80/21

1^st number: 3 0/30, 2^nd number: 3 17/21

90/30 + 80/21 is 143/21.

Steps for adding fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 30 and 21 is 210
   
   Next, find the equivalent fraction of both fractional numbers with denominator 210
2. For the 1st fraction, since 30 × 7 = 210,
   90/30 = 90 × 7/30 × 7 = 630/210
3. Likewise, for the 2nd fraction, since 21 × 10 = 210,
   80/21 = 80 × 10/21 × 10 = 800/210
4. Add the two like fractions:
   630/210 + 800/210 = 630 + 800/210 = 1430/210
5. 1430/210 simplified gives 143/21
6. So, 90/30 + 80/21 = 143/21
   In mixed form: 617/21

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