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Add 21/20 and 15/72

1st number: 1 1/20, 2nd number: 15/72

21/20 + 15/72 is 151/120.

Steps for adding fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 20 and 72 is 360

    Next, find the equivalent fraction of both fractional numbers with denominator 360
  2. For the 1st fraction, since 20 × 18 = 360,
    21/20 = 21 × 18/20 × 18 = 378/360
  3. Likewise, for the 2nd fraction, since 72 × 5 = 360,
    15/72 = 15 × 5/72 × 5 = 75/360
  4. Add the two like fractions:
    378/360 + 75/360 = 378 + 75/360 = 453/360
  5. 453/360 simplified gives 151/120
  6. So, 21/20 + 15/72 = 151/120
    In mixed form: 131/120

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