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Add 3/70 and 21/90

3/70 + 21/90 is 29/105.

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,
    3/70 = 3 × 9/70 × 9 = 27/630
  3. Likewise, for the 2nd fraction, since 90 × 7 = 630,
    21/90 = 21 × 7/90 × 7 = 147/630
  4. Add the two fractions:
    27/630 + 147/630 = 27 + 147/630 = 174/630
  5. 174/630 simplified gives 29/105
  6. So, 3/70 + 21/90 = 29/105

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