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Add 10/21 and 42/40

1st number: 10/21, 2nd number: 1 2/40

10/21 + 42/40 is 641/420.

Steps for adding fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 21 and 40 is 840

    Next, find the equivalent fraction of both fractional numbers with denominator 840
  2. For the 1st fraction, since 21 × 40 = 840,
    10/21 = 10 × 40/21 × 40 = 400/840
  3. Likewise, for the 2nd fraction, since 40 × 21 = 840,
    42/40 = 42 × 21/40 × 21 = 882/840
  4. Add the two like fractions:
    400/840 + 882/840 = 400 + 882/840 = 1282/840
  5. 1282/840 simplified gives 641/420
  6. So, 10/21 + 42/40 = 641/420
    In mixed form: 1221/420

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