Answers

Add 40/72 and 90/20

1^st number: 40/72, 2^nd number: 4 10/20

40/72 + 90/20 is 91/18.

Steps for adding fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 72 and 20 is 360
   
   Next, find the equivalent fraction of both fractional numbers with denominator 360
2. For the 1st fraction, since 72 × 5 = 360,
   40/72 = 40 × 5/72 × 5 = 200/360
3. Likewise, for the 2nd fraction, since 20 × 18 = 360,
   90/20 = 90 × 18/20 × 18 = 1620/360
4. Add the two like fractions:
   200/360 + 1620/360 = 200 + 1620/360 = 1820/360
5. 1820/360 simplified gives 91/18
6. So, 40/72 + 90/20 = 91/18
   In mixed form: 51/18

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