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If you are bad at math, this is not your fault. We were simply not taught in school mathematical tricks with which any calculations become elementary. These are techniques by which you can easily count in your mind. Quick squaring This technique will help to quickly square a two-digit number, which ends by 5. Multiply the first digit by itself 1, and add 25 at the end. That's all! Tip counting If you need to leave a 15% tip, there is an easy way to determine how much it is. Calculate 10% (divide t
