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Add 2/21 and 28/90

2/21 + 28/90 is 128/315.

Steps for adding fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 21 and 90 is 630
  2. For the 1st fraction, since 21 × 30 = 630,
    2/21 = 2 × 30/21 × 30 = 60/630
  3. Likewise, for the 2nd fraction, since 90 × 7 = 630,
    28/90 = 28 × 7/90 × 7 = 196/630
  4. Add the two fractions:
    60/630 + 196/630 = 60 + 196/630 = 256/630
  5. After reducing the fraction, the answer is 128/315

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