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Add 3/10 and 12/21

3/10 + 12/21 is 61/70.

Steps for adding fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 10 and 21 is 210
  2. For the 1st fraction, since 10 × 21 = 210,
    3/10 = 3 × 21/10 × 21 = 63/210
  3. Likewise, for the 2nd fraction, since 21 × 10 = 210,
    12/21 = 12 × 10/21 × 10 = 120/210
  4. Add the two fractions:
    63/210 + 120/210 = 63 + 120/210 = 183/210
  5. 183/210 simplified gives 61/70
  6. So, 3/10 + 12/21 = 61/70

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