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Add 18/21 and 90/64

1st number: 18/21, 2nd number: 1 26/64

18/21 + 90/64 is 507/224.

Steps for adding fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 21 and 64 is 1344

    Next, find the equivalent fraction of both fractional numbers with denominator 1344
  2. For the 1st fraction, since 21 × 64 = 1344,
    18/21 = 18 × 64/21 × 64 = 1152/1344
  3. Likewise, for the 2nd fraction, since 64 × 21 = 1344,
    90/64 = 90 × 21/64 × 21 = 1890/1344
  4. Add the two like fractions:
    1152/1344 + 1890/1344 = 1152 + 1890/1344 = 3042/1344
  5. 3042/1344 simplified gives 507/224
  6. So, 18/21 + 90/64 = 507/224
    In mixed form: 259/224

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