Answers

Add 98/21 and 56/80

1^st number: 4 14/21, 2^nd number: 56/80

98/21 + 56/80 is 161/30.

Steps for adding fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 21 and 80 is 1680
   
   Next, find the equivalent fraction of both fractional numbers with denominator 1680
2. For the 1st fraction, since 21 × 80 = 1680,
   98/21 = 98 × 80/21 × 80 = 7840/1680
3. Likewise, for the 2nd fraction, since 80 × 21 = 1680,
   56/80 = 56 × 21/80 × 21 = 1176/1680
4. Add the two like fractions:
   7840/1680 + 1176/1680 = 7840 + 1176/1680 = 9016/1680
5. 9016/1680 simplified gives 161/30
6. So, 98/21 + 56/80 = 161/30
   In mixed form: 511/30

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