A mathematical trick
Did you know that there is a quick way of squaring a two digit number which ends in 5?
Just multiply the first digit by that number plus one.... stick a 25 after your product and there's your answer .... simple ?
Q. What is 35 squared?
.....now stick on the 25
...........the answer is 1225Barry's Response
- It even seems to work with three digit numbers (using the first two digit to make a two digit number) and plain old 5, using 0 as the first digit.
Oh the handy things we can do with math,
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