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Add 15/20 and 45/70

15/20 + 45/70 is 39/28.

Steps for adding fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 20 and 70 is 140

    Next, find the equivalent fraction of both fractional numbers with denominator 140
  2. For the 1st fraction, since 20 × 7 = 140,
    15/20 = 15 × 7/20 × 7 = 105/140
  3. Likewise, for the 2nd fraction, since 70 × 2 = 140,
    45/70 = 45 × 2/70 × 2 = 90/140
  4. Add the two like fractions:
    105/140 + 90/140 = 105 + 90/140 = 195/140
  5. 195/140 simplified gives 39/28
  6. So, 15/20 + 45/70 = 39/28
    In mixed form: 111/28

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