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Add 9/21 and 21/70

9/21 + 21/70 is 51/70.

Steps for adding fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 21 and 70 is 210

    Next, find the equivalent fraction of both fractional numbers with denominator 210
  2. For the 1st fraction, since 21 × 10 = 210,
    9/21 = 9 × 10/21 × 10 = 90/210
  3. Likewise, for the 2nd fraction, since 70 × 3 = 210,
    21/70 = 21 × 3/70 × 3 = 63/210
  4. Add the two like fractions:
    90/210 + 63/210 = 90 + 63/210 = 153/210
  5. 153/210 simplified gives 51/70
  6. So, 9/21 + 21/70 = 51/70

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