Multiplication of two five digit
numbers

Suppose we have to multiply two 5 digit
numbers like

3 5 4 1 2

x 2 6 3 4 1

--------------------------

Multiplication of two five digit
numbers

Suppose we have to multiply two 5 digit
numbers like

3 5 4 1 2

x 2 6 3 4 1

--------------------------

Division of any big number ending in
five by any two digit number ending in five can be done with just
mind calculation if you use the following technique:

Suppose let us take the example 1625
divided by 35

If you multiply any three digit number
by 11 and then again multiply the product with 91 then see the
result.

see the number 578 repeats in the result

For example

Let us take a 3 digit number 578

now 578 x 11 = 6358

then 6358 x 91 = 578578

Suppose
we have to multiply two consecutive numbers say n and n+1

then n x (n+1) = n^{2} + n

If we take it in the reverse way, say (n-1) and n

then (n-1) x n = n^{2} – n

We can apply this for speed calculation,

then n x (n+1) = n

If we take it in the reverse way, say (n-1) and n

then (n-1) x n = n

We can apply this for speed calculation,

A boy went to an oil shop to buy oil with two bottles. One bottle of 5lts and the other of 3lts. Unfortunately the shop keeper didn't have the measuring vessel. The boy wanted 4lts of oil. How can the 4lts be measured using the bottles in the hand of the boy ?

One in numbers make it fun for its operations. Multiply one with any number the result will be the number itself same for the operation division also.. Let us check some operations with 1.

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