Answers

Add 25/42 and 1/40

25/42 + 1/40 is 521/840.

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,
   25/42 = 25 × 20/42 × 20 = 500/840
3. Likewise, for the 2nd fraction, since 40 × 21 = 840,
   1/40 = 1 × 21/40 × 21 = 21/840
4. Add the two like fractions:
   500/840 + 21/840 = 500 + 21/840 = 521/840
5. So, 25/42 + 1/40 = 521/840

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