Answers

Add 35/21 and 81/40

1^st number: 1 14/21, 2^nd number: 2 1/40

35/21 + 81/40 is 443/120.

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,
   35/21 = 35 × 40/21 × 40 = 1400/840
3. Likewise, for the 2nd fraction, since 40 × 21 = 840,
   81/40 = 81 × 21/40 × 21 = 1701/840
4. Add the two like fractions:
   1400/840 + 1701/840 = 1400 + 1701/840 = 3101/840
5. 3101/840 simplified gives 443/120
6. So, 35/21 + 81/40 = 443/120
   In mixed form: 383/120

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