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Add 18/21 and 9/10

18/21 + 9/10 is 123/70.

Steps for adding fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 21 and 10 is 210

    Next, find the equivalent fraction of both fractional numbers with denominator 210
  2. For the 1st fraction, since 21 × 10 = 210,
    18/21 = 18 × 10/21 × 10 = 180/210
  3. Likewise, for the 2nd fraction, since 10 × 21 = 210,
    9/10 = 9 × 21/10 × 21 = 189/210
  4. Add the two like fractions:
    180/210 + 189/210 = 180 + 189/210 = 369/210
  5. 369/210 simplified gives 123/70
  6. So, 18/21 + 9/10 = 123/70
    In mixed form: 153/70

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