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Add 4/10 and 21/42

4/10 + 21/42 is 9/10.

Steps for adding fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 10 and 42 is 210

    Next, find the equivalent fraction of both fractional numbers with denominator 210
  2. For the 1st fraction, since 10 × 21 = 210,
    4/10 = 4 × 21/10 × 21 = 84/210
  3. Likewise, for the 2nd fraction, since 42 × 5 = 210,
    21/42 = 21 × 5/42 × 5 = 105/210
  4. Add the two like fractions:
    84/210 + 105/210 = 84 + 105/210 = 189/210
  5. 189/210 simplified gives 9/10
  6. So, 4/10 + 21/42 = 9/10

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