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This technique is suitable for finding the square of number that is more than 100.

Example 1:

103 x 103 = 10609

Steps:

Find the difference between 100 and the number. 103 - 100 = 3

1. 103 + 3 = 106(00) <- Add the difference from the number being squared.
2. 3 x 3 = 9 <- Square the difference.
3. 10600 + 9 = 10609.

Example 2:

112 x 112 = 12544

Steps:
Find the difference between 100 and the number. 112 - 100 = 12

1. 112 + 12 = 124(00) <- Add the difference from the number being squared.
2. 12 x 12 = 144 <- Square the difference.
3. 12400 + 144 = 12544.

If you have better method to share, please don’t hesitate to leave your comment.

This technique is suitable for finding the square of number that falls in range of 51 and 100.

Example 1:

97 x 97 = 9409

Steps:

Find the difference between 100 and the number. 100 - 97 = 3

1. 97 - 3 = 94(00) <- Subtract the difference from the number being squared.

2. 3 x 3 = 9 <- Square the difference.

3. 9400 + 9 = 9409.

Example 2:

76 x 76 = 5776

Steps:

Find the difference between 100 and the number. 100 - 76 = 24

1. 76 - 24 = 52(00) <- Subtract the difference from the number being squared.

2. 24 x 24 = 576 <- Square the difference.

3. 5200 + 576 = 5776.

If you have better method to share, please don’t hesitate to leave your comment.

You know that 5 x 5 = 25. However, do you realize that the square of any number that ends with 5, will also contains 25 in the last 2 digits.

Example 1:

25 x 25 = 625

Steps:

Remove the last digit. We get 2.

1 + 2 = 3 <– Add 1.

3 x 2 = 6 <– Multiply 2 times the result.

6 and 25 give 625 <– Concatenate the result with 25.

Example 2:

205 x 205 = 42025

Steps:

Remove the last digit. We get 20.

1 + 20 = 21 <– Add 1.

21 x 20 = 420 <– Multiply 20 times the result.

420 and 25 give 42025 <– Concatenate the result with 25.

Example 3:

315 x 315 = 99225

Steps:

Remove the last digit. We get 31.

1 + 31 = 32 <– Add 1.

32 x 31 = 992<– Multiply 31 times the result.

992 and 25 give 99225 <– Concatenate the result with 25.

If you have better method to share, please don’t hesitate to leave your comment.

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For further information, please visit
http://www.qurbanact.blogspot.com/.

The new look of Wordpress admin page. What do you feel. Isn’t it great. I like it. If you disagree, please leave your comment.

Here is the list of blog editor tools.

1. Windows Live Writer
2. w.blogger
3. Scribefire
4. Qumana
5. BlogJet
6. BlogDesk
7. Zoundry Raven
8. Post2Blog
9. ecto
10. MarsEdit

If you don’t see an editor on the list that you can’t live without, please take a second and leave a comment about it.

These are the 10 symptoms, showing that your PC might had been infected by a virus.

Good for those PC that run no antivirus software (Do you ever need one) in background.

1. Your PC run slower than usual.
2. Loading of programs slower than usual.
3. Some of your files are missing.
4. The size of some of program files are expanding.
5. Crashes occur very often.
6. Problem in saving and opening Word documents.
7. Appearances of strange messages.
8. Some of the devices suddenly fail to work.
9. Other PCs on the network experience the same problem with your PC.
10. Very frequent access to the hard drive, even when you are not running any program

If your PC ever experience any of these symptoms, perhaps you should start to diagnose your PC for virus.

Please note, however, that virus is not the only reason for these symptoms.

Sometimes, the time might had come for you to dump your PC for a new one.

When a severe error occurs in a program, Windows XP will usually halt the program, and then Windows XP ask whether you want to send the error messages to Microsoft. However, you can actually disable this annoying features.

To disable this feature:

1. Bring up the System Properties dialog box. (In case you don’t know how to display the dialog box, please refer to How to display the System Properties dialog box)
2. Click on Advance tab.
3. Click on Error Reporting.
4. Click on Disable error reporting.