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Add 21/72 and 63/20

1st number: 21/72, 2nd number: 3 3/20

21/72 + 63/20 is 413/120.

Steps for adding fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 72 and 20 is 360
  2. For the 1st fraction, since 72 × 5 = 360,
    21/72 = 21 × 5/72 × 5 = 105/360
  3. Likewise, for the 2nd fraction, since 20 × 18 = 360,
    63/20 = 63 × 18/20 × 18 = 1134/360
  4. Add the two fractions:
    105/360 + 1134/360 = 105 + 1134/360 = 1239/360
  5. 1239/360 simplified gives 413/120
  6. So, 21/72 + 63/20 = 413/120
    In mixed form: 353/120

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