Answers

Add 90/84 and 20/40

1^st number: 1 6/84, 2^nd number: 20/40

90/84 + 20/40 is 11/7.

Steps for adding fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 84 and 40 is 840
   
   Next, find the equivalent fraction of both fractional numbers with denominator 840
2. For the 1st fraction, since 84 × 10 = 840,
   90/84 = 90 × 10/84 × 10 = 900/840
3. Likewise, for the 2nd fraction, since 40 × 21 = 840,
   20/40 = 20 × 21/40 × 21 = 420/840
4. Add the two like fractions:
   900/840 + 420/840 = 900 + 420/840 = 1320/840
5. 1320/840 simplified gives 11/7
6. So, 90/84 + 20/40 = 11/7
   In mixed form: 14/7

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