Usually people will use their existing numbers, such as telephone number, house number, birth date or social security number as their PIN number for banking. These numbers are easy to remember, nevertheless easy to be broken.
This article will give an idea on how to create a secure, but memorable PIN number.
Adding two numbers less than 100 is easy. For instance, 29 + 45 = 74. However, how fast can you do it. Can you do at least sixty additions within one minute. Actually, you can do it, but, with some practices, using the simple technique that will be discuss in this article.
This division technique can only be used if the divisor could be factorized.
272 ÷ 16 = 17
Do you know that there is an easy way to find the remainder when a number is divided by 9?
This technique is suitable for finding the square of number that is more than 100.
Example 1:
103 x 103 = 10609
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