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Faster Calculations

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Faster Calculations

Post by hjpotter92 on Tue May 13, 2008 12:05 pm

In Mathematics, we have alot of ways for easier calculations. Someof them are:

Multiplying with 11
Let the number to be multiplied is 2986.
So:
2986
x 11

2986
29860

32846

The easier one is:
Write the unitsplace as it is i.e. 6
Next add the tens and units place and write the number i.e. 14 [Carry 1 and write only 4] This becomes 46
Thirdly add hundreds and tens place i.e. 17 [add the carried digit i.e. 1 so it becomes 18] Write 8 and carry 1. So the result becomes 846

Continue in the same way till the end. You will get the answer 32846

Thereis another way to do so. The original no. was 2986. Multiply it with 10 and add the original no. to it. Thus, 29860+2986=32846
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Multiply with 5

Post by hjpotter92 on Thu May 15, 2008 2:10 pm

To multiply with 5 an easy way

Let's take a no. suppose 48. We have to calculate 48*5. We know that 48*5=240. The easier way is to half the given no. this results into 24. Now, add a zero to it which gives the answer 240.

If there is an odd number. let it be 121. so on division by 2 we get 61.5 Remove the decimal and the answer is 615.

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Issues

Post by hjpotter92 on Sat May 17, 2008 11:16 am

You can ask questions in the topic named ask questions 2 get n answer. The link is over here.

Just click on the bold black words to visit the topic

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Re: Faster Calculations

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