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Add 21/70 and 18/63

21/70 + 18/63 is 41/70.

Steps for adding fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 70 and 63 is 630

    Next, find the equivalent fraction of both fractional numbers with denominator 630
  2. For the 1st fraction, since 70 × 9 = 630,
    21/70 = 21 × 9/70 × 9 = 189/630
  3. Likewise, for the 2nd fraction, since 63 × 10 = 630,
    18/63 = 18 × 10/63 × 10 = 180/630
  4. Add the two like fractions:
    189/630 + 180/630 = 189 + 180/630 = 369/630
  5. 369/630 simplified gives 41/70
  6. So, 21/70 + 18/63 = 41/70

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