Answers

Add 42/84 and 9/10

42/84 + 9/10 is 7/5.

Steps for adding fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 84 and 10 is 420
   
   Next, find the equivalent fraction of both fractional numbers with denominator 420
2. For the 1st fraction, since 84 × 5 = 420,
   42/84 = 42 × 5/84 × 5 = 210/420
3. Likewise, for the 2nd fraction, since 10 × 42 = 420,
   9/10 = 9 × 42/10 × 42 = 378/420
4. Add the two like fractions:
   210/420 + 378/420 = 210 + 378/420 = 588/420
5. 588/420 simplified gives 7/5
6. So, 42/84 + 9/10 = 7/5
   In mixed form: 12/5

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