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Add 30/90 and 21/70

30/90 + 21/70 is 19/30.

Steps for adding fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 90 and 70 is 630

    Next, find the equivalent fraction of both fractional numbers with denominator 630
  2. For the 1st fraction, since 90 × 7 = 630,
    30/90 = 30 × 7/90 × 7 = 210/630
  3. Likewise, for the 2nd fraction, since 70 × 9 = 630,
    21/70 = 21 × 9/70 × 9 = 189/630
  4. Add the two like fractions:
    210/630 + 189/630 = 210 + 189/630 = 399/630
  5. 399/630 simplified gives 19/30
  6. So, 30/90 + 21/70 = 19/30

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