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Add 21/90 and 35/70

21/90 + 35/70 is 11/15.

Steps for adding fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 90 and 70 is 630
  2. For the 1st fraction, since 90 × 7 = 630,
    21/90 = 21 × 7/90 × 7 = 147/630
  3. Likewise, for the 2nd fraction, since 70 × 9 = 630,
    35/70 = 35 × 9/70 × 9 = 315/630
  4. Add the two fractions:
    147/630 + 315/630 = 147 + 315/630 = 462/630
  5. 462/630 simplified gives 11/15
  6. So, 21/90 + 35/70 = 11/15

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