Answers

Add 63/84 and 12/40

63/84 + 12/40 is 21/20.

Steps for adding fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 84 and 40 is 840
   
   Next, find the equivalent fraction of both fractional numbers with denominator 840
2. For the 1st fraction, since 84 × 10 = 840,
   63/84 = 63 × 10/84 × 10 = 630/840
3. Likewise, for the 2nd fraction, since 40 × 21 = 840,
   12/40 = 12 × 21/40 × 21 = 252/840
4. Add the two like fractions:
   630/840 + 252/840 = 630 + 252/840 = 882/840
5. 882/840 simplified gives 21/20
6. So, 63/84 + 12/40 = 21/20
   In mixed form: 11/20

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