Answers

Add 80/21 and 35/40

1^st number: 3 17/21, 2^nd number: 35/40

80/21 + 35/40 is 787/168.

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,
   80/21 = 80 × 40/21 × 40 = 3200/840
3. Likewise, for the 2nd fraction, since 40 × 21 = 840,
   35/40 = 35 × 21/40 × 21 = 735/840
4. Add the two like fractions:
   3200/840 + 735/840 = 3200 + 735/840 = 3935/840
5. 3935/840 simplified gives 787/168
6. So, 80/21 + 35/40 = 787/168
   In mixed form: 4115/168

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