Many of you have probably been given mathematics homework assignments where you were supposed to answer the question without using a calculator. This is quite common in trigonometry where the student’s knowledge of the unit circle avoids the need of a calculator.
The following calculator buster question looks impossible to solve without a calculator, but there is a way to solve it without substituting the expression into your calculator.
The question is what are the last two digits in ?
The idea here is to write as
You will notice that the one’s digits will cancel simplifying matters. All that will be remaining is 8 subtracted from terms containing or greater. Therefore, subtracting 8 from a number that ends with 2 zeros forces last two digits to be 92 !
Math, like chess, exercises your brain and produces a sense of satisfaction when you figure something out!