Answers

Add 40/21 and 84/20

1^st number: 1 19/21, 2^nd number: 4 4/20

40/21 + 84/20 is 641/105.

Steps for adding fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 21 and 20 is 420
   
   Next, find the equivalent fraction of both fractional numbers with denominator 420
2. For the 1st fraction, since 21 × 20 = 420,
   40/21 = 40 × 20/21 × 20 = 800/420
3. Likewise, for the 2nd fraction, since 20 × 21 = 420,
   84/20 = 84 × 21/20 × 21 = 1764/420
4. Add the two like fractions:
   800/420 + 1764/420 = 800 + 1764/420 = 2564/420
5. 2564/420 simplified gives 641/105
6. So, 40/21 + 84/20 = 641/105
   In mixed form: 611/105

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