Answers

Add 21/60 and 36/72

21/60 + 36/72 is 17/20.

Steps for adding fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 60 and 72 is 360
   
   Next, find the equivalent fraction of both fractional numbers with denominator 360
2. For the 1st fraction, since 60 × 6 = 360,
   21/60 = 21 × 6/60 × 6 = 126/360
3. Likewise, for the 2nd fraction, since 72 × 5 = 360,
   36/72 = 36 × 5/72 × 5 = 180/360
4. Add the two like fractions:
   126/360 + 180/360 = 126 + 180/360 = 306/360
5. 306/360 simplified gives 17/20
6. So, 21/60 + 36/72 = 17/20

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