Answers

Add 21/54 and 72/20

1^st number: 21/54, 2^nd number: 3 12/20

21/54 + 72/20 is 359/90.

Steps for adding fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 54 and 20 is 540
   
   Next, find the equivalent fraction of both fractional numbers with denominator 540
2. For the 1st fraction, since 54 × 10 = 540,
   21/54 = 21 × 10/54 × 10 = 210/540
3. Likewise, for the 2nd fraction, since 20 × 27 = 540,
   72/20 = 72 × 27/20 × 27 = 1944/540
4. Add the two like fractions:
   210/540 + 1944/540 = 210 + 1944/540 = 2154/540
5. 2154/540 simplified gives 359/90
6. So, 21/54 + 72/20 = 359/90
   In mixed form: 389/90

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