Answers

Add 84/21 and 81/40

1^st number: 4 0/21, 2^nd number: 2 1/40

84/21 + 81/40 is 241/40.

Steps for adding fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 21 and 40 is 840
   
   Next, find the equivalent fraction of both fractional numbers with denominator 840
2. For the 1st fraction, since 21 × 40 = 840,
   84/21 = 84 × 40/21 × 40 = 3360/840
3. Likewise, for the 2nd fraction, since 40 × 21 = 840,
   81/40 = 81 × 21/40 × 21 = 1701/840
4. Add the two like fractions:
   3360/840 + 1701/840 = 3360 + 1701/840 = 5061/840
5. 5061/840 simplified gives 241/40
6. So, 84/21 + 81/40 = 241/40
   In mixed form: 61/40

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