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Add 15/70 and 21/90

15/70 + 21/90 is 47/105.

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,
    15/70 = 15 × 9/70 × 9 = 135/630
  3. Likewise, for the 2nd fraction, since 90 × 7 = 630,
    21/90 = 21 × 7/90 × 7 = 147/630
  4. Add the two fractions:
    135/630 + 147/630 = 135 + 147/630 = 282/630
  5. 282/630 simplified gives 47/105
  6. So, 15/70 + 21/90 = 47/105

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