Answers

Add 42/70 and 90/40

1^st number: 42/70, 2^nd number: 2 10/40

42/70 + 90/40 is 57/20.

Steps for adding fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 70 and 40 is 280
   
   Next, find the equivalent fraction of both fractional numbers with denominator 280
2. For the 1st fraction, since 70 × 4 = 280,
   42/70 = 42 × 4/70 × 4 = 168/280
3. Likewise, for the 2nd fraction, since 40 × 7 = 280,
   90/40 = 90 × 7/40 × 7 = 630/280
4. Add the two like fractions:
   168/280 + 630/280 = 168 + 630/280 = 798/280
5. 798/280 simplified gives 57/20
6. So, 42/70 + 90/40 = 57/20
   In mixed form: 217/20

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