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Add 21/54 and 25/70

21/54 + 25/70 is 47/63.

Steps for adding fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 54 and 70 is 1890

    Next, find the equivalent fraction of both fractional numbers with denominator 1890
  2. For the 1st fraction, since 54 × 35 = 1890,
    21/54 = 21 × 35/54 × 35 = 735/1890
  3. Likewise, for the 2nd fraction, since 70 × 27 = 1890,
    25/70 = 25 × 27/70 × 27 = 675/1890
  4. Add the two like fractions:
    735/1890 + 675/1890 = 735 + 675/1890 = 1410/1890
  5. 1410/1890 simplified gives 47/63
  6. So, 21/54 + 25/70 = 47/63

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