Answers

Add 64/28 and 42/20

1^st number: 2 8/28, 2^nd number: 2 2/20

64/28 + 42/20 is 307/70.

Steps for adding fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 28 and 20 is 140
   
   Next, find the equivalent fraction of both fractional numbers with denominator 140
2. For the 1st fraction, since 28 × 5 = 140,
   64/28 = 64 × 5/28 × 5 = 320/140
3. Likewise, for the 2nd fraction, since 20 × 7 = 140,
   42/20 = 42 × 7/20 × 7 = 294/140
4. Add the two like fractions:
   320/140 + 294/140 = 320 + 294/140 = 614/140
5. 614/140 simplified gives 307/70
6. So, 64/28 + 42/20 = 307/70
   In mixed form: 427/70

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