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Add 72/90 and 9/42

72/90 + 9/42 is 71/70.

Steps for adding fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 90 and 42 is 630
  2. For the 1st fraction, since 90 × 7 = 630,
    72/90 = 72 × 7/90 × 7 = 504/630
  3. Likewise, for the 2nd fraction, since 42 × 15 = 630,
    9/42 = 9 × 15/42 × 15 = 135/630
  4. Add the two fractions:
    504/630 + 135/630 = 504 + 135/630 = 639/630
  5. After reducing the fraction, the answer is 71/70
  6. In mixed form: 11/70

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