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Multiplying A 2-digit Number By 98

Multiplying A 2-digit Number By 98

Multiplying a 2-digit number by 98

  1. Select a 2-digit number.
  2. Add two zeros to the number.
  3. From this, subtract two times the original number.
   Example:
  1. The 2-digit number chosen to multiply by 98 is 21.
  2. Add two zeros: 2100.
  3. From this, subtract two times the original number: 2100 - 2(21) = 2100 - 42 = 2058.
  4. So 21 × 98 = 2058.

   See the pattern?

  1. The 2-digit number chosen to multiply by 98 is 52.
  2. Add two zeros: 5200.
  3. From this, subtract two times the original number: 5200 - 2(52) = 5200 - 104 = 5100 - 104 = 5096.
  4. So 52 × 98 = 5096.




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26 Sep, 2021, 03:24:36 AM