Answers

Add 81/4 and 21/40

1^st number: 20 1/4, 2^nd number: 21/40

81/4 + 21/40 is 831/40.

Steps for adding fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 4 and 40 is 40
   
   Next, find the equivalent fraction of both fractional numbers with denominator 40
2. For the 1st fraction, since 4 × 10 = 40,
   81/4 = 81 × 10/4 × 10 = 810/40
3. Likewise, for the 2nd fraction, since 40 × 1 = 40,
   21/40 = 21 × 1/40 × 1 = 21/40
4. Add the two like fractions:
   810/40 + 21/40 = 810 + 21/40 = 831/40
5. So, 81/4 + 21/40 = 831/40
   In mixed form: 2031/40

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