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Add 21/20 and 18/45

1st number: 1 1/20, 2nd number: 18/45

21/20 + 18/45 is 29/20.

Steps for adding fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 20 and 45 is 180

    Next, find the equivalent fraction of both fractional numbers with denominator 180
  2. For the 1st fraction, since 20 × 9 = 180,
    21/20 = 21 × 9/20 × 9 = 189/180
  3. Likewise, for the 2nd fraction, since 45 × 4 = 180,
    18/45 = 18 × 4/45 × 4 = 72/180
  4. Add the two like fractions:
    189/180 + 72/180 = 189 + 72/180 = 261/180
  5. 261/180 simplified gives 29/20
  6. So, 21/20 + 18/45 = 29/20
    In mixed form: 19/20

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