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Published bySpencer Owen Modified about 1 year ago

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Topics for this presentation are 1. Astronomical multiplication 2. Cube root 3. Square root,etc Done by L.Hariharan

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Aim: To multiply * Don’t try it in your calculator it will give you only an approximate value. Let us do it now mentally. We will try to understand it with simple example { Nearest + or - to give 100,1000,etc} * { 92-5 = 87 or 95-8 = 87 } and 8*5=40 Answer is 8740

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Similarly answer for astronomical multiplication is ANSWER Now let us go to find cube roots

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Finding cube root requires some background

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Examples : 9,261 1,728 32, ,616 Solution for 32,768 By seeing last digit we find last digit of cube root is equal to 2. (refer previous slide) By seeing 32 we put 3, as our first digit as 3 3 = 27 is less than 32 and 4 3 = 64 is more. Our answer is 32.

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What is the square root of the number given below? a) b) c) d) Note : Expected time to solve the problem is 5 to 10 seconds

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First of all the pattern: Square of 1 = 1 Square of 11 = 121 Square of 111 = Square of 1111 = Square of = Square of = Square of = And so on and so forth. Answer choice is c

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Note: No.s are arranged in knight movement as in the chess game. The sum is 260.

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