Answers

Add 81/72 and 42/10

1^st number: 1 9/72, 2^nd number: 4 2/10

81/72 + 42/10 is 213/40.

Steps for adding fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 72 and 10 is 360
   
   Next, find the equivalent fraction of both fractional numbers with denominator 360
2. For the 1st fraction, since 72 × 5 = 360,
   81/72 = 81 × 5/72 × 5 = 405/360
3. Likewise, for the 2nd fraction, since 10 × 36 = 360,
   42/10 = 42 × 36/10 × 36 = 1512/360
4. Add the two like fractions:
   405/360 + 1512/360 = 405 + 1512/360 = 1917/360
5. 1917/360 simplified gives 213/40
6. So, 81/72 + 42/10 = 213/40
   In mixed form: 513/40

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