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Showing posts from June 19, 2011

Addition

Addition When we were at school, we have been taught how to sum two or more numbers together by using the right to left approach. With this method, you first sum the decimal part of the number, then you move to the hundreds and so on. This works good on paper, but it’s a pain when you’re doingmental calculations. Fortunately, the solution is very easy. Left to right approach Instead of using a right to left approach, we can start from the left and move to theright. Take the following example: Usually, you would first sum up 4 to 45, and then and 30 to the result. But by using the left to right approach, you first sum up 30 to 45, and then you add 4 to the result. Although this exampleis very simple, you’ll see theadvantages of this method as you start to use it. If you’re working with three digits numbers, the process is the same. For example 45+34 now, (45+30)=(75+4)=79 This example is a bit more complicated than the previous one, yet it’s very easy to solve using the left t

Quickly find percentages

Quickly find percentages *. To find out the 15% of a number, divide it by 10 andthe add half of it. *. To find out the 20% of a number, divide it by 10 andmultiply the result by two. *. To find out the 5% of a number, divide it by 10 andthe divide it by two.

Multiply by 9

Multiply by 9 To multiply by 9, simply multiply by 10 and then subtract the number itself. For example 9*11 now, 9*11=10*11=110-11=99

Multiply any two digits numbers with the same first digit and the second digit that sums up to 10

Multiply any two digits numbers with the same first digit and the second digit that sums up to 10 Let’s say that you want to multiply 42 and 48 together. Notice that they both start with 4, and that the sum of their second digit is 10. In this case there’s a simple rule that you can use to find their product. Simply multiply the first digit (4) for the nexthigher number (5) and then append the product of their second digits. For example 1).42*48 now, (4*5)(2*8)=2016 2).91*99 Now, (9*10)(1*9)=9009 Note that if the product of the second digits is below ten, you have to add a 0 in front of it.

How to multiply any two digits number by 11

How to multiply any two digits number by 11 Let’s say that you want to find the product of 36 and 11. One way to find it would be to multiply 36 by 10 and then add 36 on the result. There is, however, a simple trick that’ll do the job for any two digits number. To find out the result, write the first digit followed by the addition of the first and second digit, followed by the second digit. For example 36*11 now, 3(3+6)6=396 Example: What happens if the sum of the two numbers is bigger than 9? In this case you add 1 to the first number, followed by the last digit of the addition of the two numbers, and then again you add the second number For example 87*11 now, 8(8+7)7=957

Square any two digits number that ends with 5

Square any two digits number that ends with 5 Calculating the square of a number below 100 is extremely simple. If you wantto find the square of 25 for example, you simply have to take the first digit (2), multiply it for the next highernumber (3), and then add 25 to the result. For example 1). 25*25 now, (2*3)25=625 2). 75*75 now, (7*8)25=5625

Multiplying by 11

Multiplying by 11 is easier when adjusting the rule for multiplying by 9. Just think of11 as (10+1) So 436 × 11 = 4360 + 436 = 4796…that’s the simpler way of explaining why the digits add up to each other like youwrote: 4360 + 436 —– 4796

How to multiply any two digits number by 11

How to multiply any two digits number by 11 Let’s say that you want to find the product of 36 and 11. One way to find it would be to multiply 36 by 10 and then add 36 on the result. There is, however, a simple trick that’ll do the job for any two digits number. To find out the result, write the first digit followed by the addition of the first and second digit, followed by the second digit. Example: What happens if the sum of the two numbers is bigger than 9? In this case you add 1 to the first number, followed by the last digit of the addition of the two numbers, and then again youadd the second number

Multiplying by 11

Multiplying by 11 is easier when adjusting the rule for multiplying by 9. Just think of11 as (10+1) So 436 × 11 = 4360 + 436 = 4796…that’s the simpler way of explaining why the digits add up to each other like youwrote: 4360 + 436 —– 4796

Multiplication tricks

Link to previous multiplication post 7. Squaring other 2-digit numbers Let’s say you want to square58. Square each digit and write a partial answer. 5×5 = 25. 8×8 = 64. Write down 2564 to start. Then, multiply the two digits of the number you’re squaring together, 5×8=40. Double this product: 40×2=80, then add a 0 to it, getting 800. Add 800 to 2564 to get 3364. This is pretty complicated so let’s do more examples. 32×32. The first part of the answer comes from squaring 3 and 2. 3×3=9. 2×2 = 4. Write down 0904. Notice the extra zeros.It’s important that every square in the partial product have two digits. Multiply the digits, 2 and 3, together and double the whole thing. 2×3x2 = 12. Add a zero to get 120. Add 120 to the partial product, 0904, and we get 1024. 56×56. The partial product comes from 5×5 and 6×6. Write down 2536. 5×6x2 = 60. Add a zero to get 600. 56×56 = 2536+600 = 3136. One more example: 67×67. Write down 3649 as the partial product. 6×7x2 = 42×2 = 84. Add

Multiplication tricks

1. Multiplying by 9, or 99, or 999 Multiplying by 9 is really multiplying by 10-1. So, 9×9 is just 9x(10-1) which is 9×10-9 which is 90-9 or 81. Let’s try a harder example: 46×9 = 46×10-46 = 460-46 =414. One more example: 68×9 = 680-68 = 612. To multiply by 99, you multiply by 100-1. So, 46×99 = 46x(100-1) = 4600-46 = 4554. Multiplying by 999 is similar to multiplying by 9 and by 99. 38×999 = 38x(1000-1) = 38000-38 = 37962. 2. Multiplying by 11 To multiply a number by 11 you add pairs of numbers next to each other, except for the numbers on the edges. Let me illustrate: To multiply 436 by 11 go fromright to left. First write down the 6 then add 6 to its neighbor on the left, 3, to get 9. Write down 9 to the left of 6. Then add 4 to 3 to get 7. Write down 7. Then, write down the leftmostdigit, 4. So, 436×11 = is 4796. Let’s do another example: 3254×11. The answer comes from these sums and edge numbers: (3)(3+2)(2+5)(5+4)(4) = 35794. One more example, this one involvi

Addition Tricks – Addition from Left To Right

When you learned how to do math in school, you probably learned how to do it from right to left.  One of the secrets to doing fast math tricks in your head is to learn how to solve mathematical problems from left to right. Actually, learning this mathtricks method is not very difficult.  In fact, your brain is already hard-wired for solving math problems from left to right; you have spent years reading left to right, correct?  Well, then your brain is trained to think from left to right – so lets try it with some simple addition problems! Addition Example 1 45 + 38 This is a very easy problem, and it is even easier if you solve it from left to right.  First, break down the number 38 into it’s tens and ones: 30 + 8 Now add the numbers in this fashion: 45 + 30 75 + 8 = 83 So the full breakdown of theproblem looks like this: 45 + 38 = 45 + (30 + 8) Once you have the problem in this format, it is much easier to solve. Addition Example 2 384 + 467 Once again, to solve this pr

Age Calculation

Age Calculation Age Calculation Tricks: Step1 : Multiply the first number of the age by 5. (If <10, ex 5, consider it as 05. If it is >100, ex: 102, then take 10 as the first digit, 2 as the second one.) Step2 : Add 3 to the result. Step3 : Double the answer. Step4 : Add the second digit of the number with the result. Step5 : Subtract 6 from it. Answer: That is your age.

Addition Tricks – Addition from Left To Right

When you learned how to do math in school, you probably learned how to do it from right to left.  One of the secrets to doing fast math tricks in your head is to learn how to solve mathematical problems from left to right. Actually, learning this mathtricks method is not very difficult.  In fact, your brain is already hard-wired for solving math problems from left to right; you have spent years reading left to right, correct?  Well, then your brain is trained to think from left to right – so lets try it with some simple addition problems! Addition Example 1 45 + 38 This is a very easy problem, and it is even easier if you solve it from left to right.  First, break down the number 38 into it’s tens and ones: 30 + 8 Now add the numbers in this fashion: 45 + 30 75 + 8 = 83 So the full breakdown of theproblem looks like this: 45 + 38 = 45 + (30 + 8) Once you have the problem in this format, it is much easier to solve. Addition Example 2 384 + 467 Once again, to solve this pr

How to delete undeletable file

How to delete undeletable file 1>>Open a Command Prompt window and leave it open. Close all open programs. Click Start, Run and enter TASKMGR.EXE Go to the Processes tab and End Process on Explorer.exe. Leave Task Manager open. Go back to the Command Prompt window and change to the directory the AVI (or other undeletable file) is located in. At the command prompt type DEL where is the file you wish to delete. Go back to Task Manager, click File, New Task and enter EXPLORER.EXE to restart the GUI shell. Close Task Manager. Or you can try this Open Notepad.exe Click File>Save As..> locate the folder where ur undeletable file is Choose ‘All files’ from the filetype box click once on the file u wannadelete so its name appears in the ‘filename’ box put a ” at the start and end of the filename (the filename should have the extension of the undeletable file so it will overwrite it) click save, It should ask u to overwrite the existing file, choo

Reset Your Mobile Memory Card Password 2 minutes

Reset Your Mobile Memory Card Password 2 minutes We usually set password for our memory card for privacy and security, but the commonmistake every one does at least once in out life time forgetting password. If you set password for mobile memory card, then you should be not forget the password. If you does then the only option is to formate your memory card with the help of the card reader and eventually the loss of all your data stored on it. Thereis a way to break the security wall. If you are a Symbian device lover then noneed to worry about the password. You can crack them in few minutes. In this tutorial I am going to teach you how to reset your memory card password in easy step. Before we start you need to have X-plore (application used to explore your system files and folder even the hidden folders in your device) Step1: Install X-Plore in your mobile. If you want to download X-Plore search around internet you can download free trail. Step2: Open your X-plore apps and Press

how to set avideo as background desktop in your pc

how to set avideo as background desktop in your pc Do you want to set a Video as your desktop background instead of wallpaper ?                       Its very simple to impress your buddies by doing so... If you want set a video background, just follow this simple steps:- 1. First of all you need a VLC player installed in your OS to perform this task. If not than download the VLC player from internet and install it. 2. Run VLC media player,go to                                    Settings->preferences->Interface->Main interfaces, then click on wxWidgets. Remove the tick on                                  "Taskbar" and put a tick on "Systray icon". 3. Now go to Video ->OutputModules->DirectX. On the bottom right puta tick on advanced options check box. You will now see some options. Put a tick on                                               "Enable WallpaperMode ". 4. Now,select playlist and put a check or tick on "Repeat cu

Windows 7 Shortcut Keys in Keyboard

Windows 7 Shortcut Keys in Keyboard Win + Spacebar – Aero desktop peek, just like that small rectangle at the aptly underneath confront next to the time sight. Win + Left Arrow – Toggle docking to half the screen early by the left half. Win + Aptly Arrow – Toggledocking to half the screen early by the aptly half. Win + Shift + Left Arrow – Go the dialogue box one monitor left in a multi-monitor sight. Win + Shift + Aptly Arrow – Go the dialogue box one monitor aptly in a multi-monitor sight. Win + Up Arrow – Maximize Win + Down Arrow – Minimize Win + Home – Minimize/Maximize all inactive windows. Win + P – Show presentation mode projector options. Win + G – Show desktop gadgets. Win + Any digit (1, 2, 3, .., 0) – Open the corresponding taskbar pinned program. Ctrl + Click – A pinned taskbar icon to cycle through the program’s openwindows. Ctrl + Shift + Click – A pinned taskbar icon to run a new instance of the program as administrator. Shift + Click – A pinned taskbar ic