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Add 21/45 and 4/90

21/45 + 4/90 is 23/45.

Steps for adding fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 45 and 90 is 90
  2. For the 1st fraction, since 45 × 2 = 90,
    21/45 = 21 × 2/45 × 2 = 42/90
  3. Likewise, for the 2nd fraction, since 90 × 1 = 90,
    4/90 = 4 × 1/90 × 1 = 4/90
  4. Add the two fractions:
    42/90 + 4/90 = 42 + 4/90 = 46/90
  5. 46/90 simplified gives 23/45
  6. So, 21/45 + 4/90 = 23/45

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