Answers

Add 80/40 and 45/72

1^st number: 2 0/40, 2^nd number: 45/72

80/40 + 45/72 is 21/8.

Steps for adding fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 40 and 72 is 360
   
   Next, find the equivalent fraction of both fractional numbers with denominator 360
2. For the 1st fraction, since 40 × 9 = 360,
   80/40 = 80 × 9/40 × 9 = 720/360
3. Likewise, for the 2nd fraction, since 72 × 5 = 360,
   45/72 = 45 × 5/72 × 5 = 225/360
4. Add the two like fractions:
   720/360 + 225/360 = 720 + 225/360 = 945/360
5. 945/360 simplified gives 21/8
6. So, 80/40 + 45/72 = 21/8
   In mixed form: 25/8

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