Answers

Add 81/70 and 5/60

1^st number: 1 11/70, 2^nd number: 5/60

81/70 + 5/60 is 521/420.

Steps for adding fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 70 and 60 is 420
   
   Next, find the equivalent fraction of both fractional numbers with denominator 420
2. For the 1st fraction, since 70 × 6 = 420,
   81/70 = 81 × 6/70 × 6 = 486/420
3. Likewise, for the 2nd fraction, since 60 × 7 = 420,
   5/60 = 5 × 7/60 × 7 = 35/420
4. Add the two like fractions:
   486/420 + 35/420 = 486 + 35/420 = 521/420
5. So, 81/70 + 5/60 = 521/420
   In mixed form: 1101/420

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