Sometimes we think how to calculate quickly without using a calculator or other bentu tool. This discussion is about how calculate the multiplication of numbers with the number 11, the following explanation.
2541 × 11 = 27 951
723 512 × 11 = 7958632
12345 × 11 = 135 795
Quickly without a calculator! How to?
Tricks: In a number that is multiplied by 11, each number is summed with the next number, the first number and the last will be first and the last digit on the results multiplicative.
Understood? Hopefully easily understood yes. Very fun to play with numbers (for those who like it).
