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Add 1/21 and 4/90

1/21 + 4/90 is 29/315.

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,
    1/21 = 1 × 30/21 × 30 = 30/630
  3. Likewise, for the 2nd fraction, since 90 × 7 = 630,
    4/90 = 4 × 7/90 × 7 = 28/630
  4. Add the two fractions:
    30/630 + 28/630 = 30 + 28/630 = 58/630
  5. 58/630 simplified gives 29/315
  6. So, 1/21 + 4/90 = 29/315

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