Answers

Add 45/72 and 72/70

1^st number: 45/72, 2^nd number: 1 2/70

45/72 + 72/70 is 463/280.

Steps for adding fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 72 and 70 is 2520
   
   Next, find the equivalent fraction of both fractional numbers with denominator 2520
2. For the 1st fraction, since 72 × 35 = 2520,
   45/72 = 45 × 35/72 × 35 = 1575/2520
3. Likewise, for the 2nd fraction, since 70 × 36 = 2520,
   72/70 = 72 × 36/70 × 36 = 2592/2520
4. Add the two like fractions:
   1575/2520 + 2592/2520 = 1575 + 2592/2520 = 4167/2520
5. 4167/2520 simplified gives 463/280
6. So, 45/72 + 72/70 = 463/280
   In mixed form: 1183/280

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