## Tuesday, August 2, 2011

### Fun With Math

I hear you, I hear you... Math and Fun in the same sentence?
By the way, did you know that there are 293 ways to make change for a dollar?

Check this out!
111,111,111 x 111,111,111 = 12,345,678,987,654,321

This one seems hard, but it's very simple really...

You can easily figure out the day of the week for any date given.  Here's how...
January        0
February       3
March           3
April              6
May              1
June              4
July               6
August          2
September    5
October        0
November     3
December    5

Step1: Pick a date. Ex: 23rd June 1986
Step2: Find the number of the month on the list, June is 4.
Step3: Take the date of the month, that is 23
Step4: Take the last 2 digits of the year, that is 86.
Step5: Find out the number of leap years by dividing the last 2 digits of the year by 4, 86 divide by 4 is 21.
Step6: Now add all 4 numbers: 4 + 23 + 86 + 21 = 134.
Step7: Divide, finding the remainder of your quotient Ex: 134 by 7 = 19 remainder 1.

The reminder tells you the day.
Sunday          0
Monday         1
Tuesday        2
Wednesday   3
Thursday       4
Friday           5
Saturday       6

Here's another very cool math trick...

Step 1
Ask a friend to think of a number between 1 and 10.
Example: 8

Step 2
Get them to double it.
Example: 16

Step 3
Example: 26

Step 4
Then get them to divide by 2.
Example: 13

Step 5
Ask them to tell you what number they now have.
Example: 13

Step 6
You subtract 5 from this and tell them what their original number was.
Example: 13 - 5 = 8

Note: If you wish to take turns to practice your mental maths, you can also use 2 and 3 digit numbers to make it harder!

Add up the following numbers out loud, starting at the top and, adding on each number as you go -

 1000 40 1000 10 1000 40 1000 10

Scroll down for a surprise!
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Did you get an answer of five thousand?

Good!  You are WRONG!... Try again, or use a calculator.

Cool Patterns...
12345679 x 9 = 111 111 111
12345679 x18 = 222 222 222
12345679 x 27 = 333 333 333
12345679 x 36 = 444 444 444
12345679 x 45 = 555 555 555
12345679 x 54 = 666 666 666
12345679 x 63 = 777 777 777
12345679 x 72 = 888 888 888
12345679 x 81 = 999 999 999