Answers

Add 90/42 and 60/40

1^st number: 2 6/42, 2^nd number: 1 20/40

90/42 + 60/40 is 51/14.

Steps for adding fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 42 and 40 is 840
   
   Next, find the equivalent fraction of both fractional numbers with denominator 840
2. For the 1st fraction, since 42 × 20 = 840,
   90/42 = 90 × 20/42 × 20 = 1800/840
3. Likewise, for the 2nd fraction, since 40 × 21 = 840,
   60/40 = 60 × 21/40 × 21 = 1260/840
4. Add the two like fractions:
   1800/840 + 1260/840 = 1800 + 1260/840 = 3060/840
5. 3060/840 simplified gives 51/14
6. So, 90/42 + 60/40 = 51/14
   In mixed form: 39/14

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