Answers

Add 81/60 and 42/45

1^st number: 1 21/60, 2^nd number: 42/45

81/60 + 42/45 is 137/60.

Steps for adding fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 60 and 45 is 180
   
   Next, find the equivalent fraction of both fractional numbers with denominator 180
2. For the 1st fraction, since 60 × 3 = 180,
   81/60 = 81 × 3/60 × 3 = 243/180
3. Likewise, for the 2nd fraction, since 45 × 4 = 180,
   42/45 = 42 × 4/45 × 4 = 168/180
4. Add the two like fractions:
   243/180 + 168/180 = 243 + 168/180 = 411/180
5. 411/180 simplified gives 137/60
6. So, 81/60 + 42/45 = 137/60
   In mixed form: 217/60

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