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Add 4/21 and 40/42

4/21 + 40/42 is 8/7.

Steps for adding fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 21 and 42 is 42

    Next, find the equivalent fraction of both fractional numbers with denominator 42
  2. For the 1st fraction, since 21 × 2 = 42,
    4/21 = 4 × 2/21 × 2 = 8/42
  3. Likewise, for the 2nd fraction, since 42 × 1 = 42,
    40/42 = 40 × 1/42 × 1 = 40/42
  4. Add the two like fractions:
    8/42 + 40/42 = 8 + 40/42 = 48/42
  5. 48/42 simplified gives 8/7
  6. So, 4/21 + 40/42 = 8/7
    In mixed form: 11/7

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