Tricky Tricks ›› Math Tricks ›› Multiply Tricks ›› Multiplying two digit number by 1001

Multiplying two digit number by 1001

Multiplying a 2-digit number by 1001 and adding 21
  1. Select a 2-digit number.
  2. Write it twice.
  3. Write one zero between the 2-digit numbers.
  4. Add 21.

Example:

  1. 12 × 1001 = 12012
    12012 + 21 = 12033
  2. So 12 × 1001 + 21 = 12033

Multiplying a 3-digit number by 1001 and adding 201
  1. Select a 3-digit number.
  2. Write it twice.
  3. Add 201.

Example:

  • 123 × 1001 = 123123
  • 123123 + 201 = 123324
  • So 123 × 1001 + 201 = 123324
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