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Add 7/70 and 21/90

7/70 + 21/90 is 1/3.

Steps for adding fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 70 and 90 is 630
  2. For the 1st fraction, since 70 × 9 = 630,
    7/70 = 7 × 9/70 × 9 = 63/630
  3. Likewise, for the 2nd fraction, since 90 × 7 = 630,
    21/90 = 21 × 7/90 × 7 = 147/630
  4. Add the two fractions:
    63/630 + 147/630 = 63 + 147/630 = 210/630
  5. 210/630 simplified gives 1/3
  6. So, 7/70 + 21/90 = 1/3

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