Could you ever done this on your calculator

Calculators are minicomputers where its invention made a tremendous impact on technology especially in the field of mathematics. now calculators are available with different sizes and shapes with added features and complex mathematical equations

Do you ever done this on your calculator.

here are some fun with the calculator

12345679 * 9 = 111111111 
12345679 * 18 = 222222222
12345679 * 27 = 333333333
12345679 * 36 = 444444444
12345679 * 45 = 555555555
12345679 * 54 = 666666666
12345679 * 63 = 777777777
12345679 * 72 = 888888888
12345679 * 81 = 999999999
12345679 * 999999999 = 12345678987654321

Try this in a calculator: Trick 2

Divide  1/7

The result will be 0.142857142857...

then

2/7  will get 0.285714285714...

then

3/7 will be 0.428571428571...

see the similarity in each case the same digits 

"142857" is repeating over and over again, just starting at a different spot.

Try this in a calculator: Trick3

 

Type any random three digit number twice

For Example: lets start with number 789, so we get 789789

divide the number by 11:  789789 / 11 = 71799

Then divide by 13: 71799/ 13 = 5523

Then divide by the original number: 5523/ 789 = 7

You will always ends with 7

Try this with any other random three digit number,any how it ends with  7 

Try this in a calculator: Trick4

Ask your friend to choose a numbers between 1 and 10
Ask them to double the number, then offer them a random number  add with the result, it may be 10,20,50 etc..
then find its half or divide that by 2
Now get them subtract their choosed number from the it, and now you announce the result.
the result will be always half of the offered number ie, if we offered 20 to add then result will be 10 or if choose 50
 then 25 

For example: the number chooses is 6
when double its 12
now we offer a 50,So  12 +50=62
let them take the half:62/2=31
and then when your friend subtract choosed number that is 6 from that you get 25 which is the half of offered number.so you can say that 25 is the current answer.

like wise you can try with any other numbers.note that the answer will always the half of the number we offered