Become a maths master!

B

Bazil

0
Want to be able to multiply any numbers between 11 and 19 in your head?

Then do this:

Example 19X18

Place them on top of each other in your head

19
18

Then create an Africa shape to cover the digits so you have
19
8

Add 19+8=27
Add a 0 to multiply by 10=270
then multiply the covered lower digit (8) by the number above it (9)
9x8=72 and then add that to the 270
270+72=342

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

13X17

13
7
=20
adding a 0 that becomes 200
3X7=21
total is 221

View the Commer resto thread here http://66.129.69.181/forum/topic.asp?TOPIC_ID=3555 And more pics here: http://s786.photobucket.com/albums/yy149/bazil1972/

mybanner4ab7d769aa2c9.jpg
 
It's quicker with a calculator :)

BAZROCKS.jpg
If I told you I was a pathological liar, would you believe me?
Peggy's got an MOT !!! (not a lie)
 
Originally posted to make your head hurt!

But, as I am a builder and mental arithmatic is something I need regularly, this could prove quite valuable to me!.

View the Commer resto thread here http://66.129.69.181/forum/topic.asp?TOPIC_ID=3555 And more pics here: http://s786.photobucket.com/albums/yy149/bazil1972/

mybanner4ab7d769aa2c9.jpg
 
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