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Add 21/42 and 70/45

1st number: 21/42, 2nd number: 1 25/45

21/42 + 70/45 is 37/18.

Steps for adding fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 42 and 45 is 630

    Next, find the equivalent fraction of both fractional numbers with denominator 630
  2. For the 1st fraction, since 42 × 15 = 630,
    21/42 = 21 × 15/42 × 15 = 315/630
  3. Likewise, for the 2nd fraction, since 45 × 14 = 630,
    70/45 = 70 × 14/45 × 14 = 980/630
  4. Add the two like fractions:
    315/630 + 980/630 = 315 + 980/630 = 1295/630
  5. 1295/630 simplified gives 37/18
  6. So, 21/42 + 70/45 = 37/18
    In mixed form: 21/18

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