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Add 21/42 and 9/10

21/42 + 9/10 is 7/5.

Steps for adding fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 42 and 10 is 210
  2. For the 1st fraction, since 42 × 5 = 210,
    21/42 = 21 × 5/42 × 5 = 105/210
  3. Likewise, for the 2nd fraction, since 10 × 21 = 210,
    9/10 = 9 × 21/10 × 21 = 189/210
  4. Add the two fractions:
    105/210 + 189/210 = 105 + 189/210 = 294/210
  5. After reducing the fraction, the answer is 7/5
  6. In mixed form: 12/5

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