Square roots of positive numbers

Square roots of positive numbers

         

what is a square of numbers?and square roots?

let us see how.....

if we say,13 × 13 = 169

∴ 169 is the square of 13, and 13 is the square root of 169. 

now.....

what is the difference between Square roots of positive numbers

and negative numbers?

It is customary not to write ‘+’ sign before a positive number. For example, +10 = 10. We shall, henceforth, observe this convention in all discussions.

6 × 6 = 36 ∴ 6 is the square root of 36.

Similarly, (-6) × (-6) = 36       ∴ (-6) too is a square root of 36.

          Thus, 6 and -6 are the two square roots of 36.

          

In the same way, work out in your mind the pairs of numbers of which 4, 49 and 121 are the squares and write statements like the above.

What do we learn by observing the numbers and their square roots in the above examples? we see that –

* Every positive number has two square roots.

* These square roots are opposite numbers of each other.

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The next in the line is a very traditional way to teach children about any subject and when applied to math 

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How to count percentage

You may have come across news items like the following in newspapers, on the radio or TV, etc.

          There has been a 15 percent increase in food grain production.

          The cost of petrol has risen by 5 percent.

          Banks reduced interest rates by 1 percent.

          We use the word percent often in everyday affairs. Let us find out the meaning of these words and learn how they are used.

          Look at the ratios  62/100 , 75/100   , 100/100 .

          The denominator of each of the ratios is 100. Such a ratio is called a percentage. A percentage is written using the word percent or the symbol %.

          The ratio  is written as 62% or 62 percent.

          Similarly,  means 75 percent or 75%.

                              means 100 percent or 100%.

This video shows you how to count percentage in details.

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In this video you will learn how to count profit and loss

If selling price is more than the cost price, we say that the seller has made a profit.

* Profit is calculated by subtracting the cost price from the selling price.

* If the selling price is less than the cost price, we say that the seller incurred a loss.

* Loss is calculated by subtracting the selling price from the cost price.

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