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Add 18/70 and 21/90

18/70 + 21/90 is 103/210.

Steps for adding fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 70 and 90 is 630

    Next, find the equivalent fraction of both fractional numbers with denominator 630
  2. For the 1st fraction, since 70 × 9 = 630,
    18/70 = 18 × 9/70 × 9 = 162/630
  3. Likewise, for the 2nd fraction, since 90 × 7 = 630,
    21/90 = 21 × 7/90 × 7 = 147/630
  4. Add the two like fractions:
    162/630 + 147/630 = 162 + 147/630 = 309/630
  5. 309/630 simplified gives 103/210
  6. So, 18/70 + 21/90 = 103/210

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