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Add 7/10 and 21/90

7/10 + 21/90 is 14/15.

Steps for adding fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 10 and 90 is 90
  2. For the 1st fraction, since 10 × 9 = 90,
    7/10 = 7 × 9/10 × 9 = 63/90
  3. Likewise, for the 2nd fraction, since 90 × 1 = 90,
    21/90 = 21 × 1/90 × 1 = 21/90
  4. Add the two fractions:
    63/90 + 21/90 = 63 + 21/90 = 84/90
  5. 84/90 simplified gives 14/15
  6. So, 7/10 + 21/90 = 14/15

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