Answers

Add 6/84 and 21/40

6/84 + 21/40 is 167/280.

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,
   6/84 = 6 × 10/84 × 10 = 60/840
3. Likewise, for the 2nd fraction, since 40 × 21 = 840,
   21/40 = 21 × 21/40 × 21 = 441/840
4. Add the two like fractions:
   60/840 + 441/840 = 60 + 441/840 = 501/840
5. 501/840 simplified gives 167/280
6. So, 6/84 + 21/40 = 167/280

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