Answers

Add 15/70 and 42/20

1^st number: 15/70, 2^nd number: 2 2/20

15/70 + 42/20 is 81/35.

Steps for adding fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 70 and 20 is 140
   
   Next, find the equivalent fraction of both fractional numbers with denominator 140
2. For the 1st fraction, since 70 × 2 = 140,
   15/70 = 15 × 2/70 × 2 = 30/140
3. Likewise, for the 2nd fraction, since 20 × 7 = 140,
   42/20 = 42 × 7/20 × 7 = 294/140
4. Add the two like fractions:
   30/140 + 294/140 = 30 + 294/140 = 324/140
5. 324/140 simplified gives 81/35
6. So, 15/70 + 42/20 = 81/35
   In mixed form: 211/35

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