Answers

Add 42/21 and 48/40

1^st number: 2 0/21, 2^nd number: 1 8/40

42/21 + 48/40 is 16/5.

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,
   42/21 = 42 × 40/21 × 40 = 1680/840
3. Likewise, for the 2nd fraction, since 40 × 21 = 840,
   48/40 = 48 × 21/40 × 21 = 1008/840
4. Add the two like fractions:
   1680/840 + 1008/840 = 1680 + 1008/840 = 2688/840
5. 2688/840 simplified gives 16/5
6. So, 42/21 + 48/40 = 16/5
   In mixed form: 31/5

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