Answers

Add 80/21 and 49/40

1^st number: 3 17/21, 2^nd number: 1 9/40

80/21 + 49/40 is 4229/840.

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,
   49/40 = 49 × 21/40 × 21 = 1029/840
4. Add the two like fractions:
   3200/840 + 1029/840 = 3200 + 1029/840 = 4229/840
5. So, 80/21 + 49/40 = 4229/840
   In mixed form: 529/840

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