CurrentGK -> General Knowledge -> Mathematical Tricks -> Multiplying A 2-digit Number By 1 1/8

If you find this context important and usefull. We request to all visitors to sheare this with your friends on social networking channels.

Multiplying A 2-digit Number By 1 1/8

Multiplying A 2-digit Number By 1 1/8

Multiplying a 2-digit number by 1 1/8

  1. Multiply the number by 9.
  2. Divide by 8.

 

   Example:
  1. If the 2-digit number chosen to multiply by 1 1/8 is 32:
  2. Multiply by 9: 9 × 32 = 270 + 18 = 288
  3. Divide by 8: 288/8 = 36
  4. So 32 × 1 1/8 = 36.

   See the pattern?

  1. If the number to be multiplied by 1 1/8 is 71:
  2. Multiply by 9: 9 × 71 = 639
  3. Divide by 8: 639/8 = 79 7/8
  4. So 71 × 1 1/8 = 79 78.




Tags


#

08 Dec, 2019, 03:52:19 AM