



MULTIPLYING
BY 1/2 is really nothing more than cutting a number in half. Now sometimes
that is an easy thing to do, like 1/2 x 4 = 2, because half of four is
two.
Other times it is not quite so easy to cut a number in half, like 1/2 x 735 = ? Here we will show you some quick and elegant ways to cut in half in your mind. FIRST: Here take a look :
Now you try a few. Click on the question mark to see if you are correct.
SECOND: So it looks like we need to mentally halve two EASY parts instead of one hard part. (6 + 1)(1/2) means half of six PLUS half of one, or 3+.5=3.5. Let's try 9: Nine = 8 + 1, so we just cut those each in half and put the halves together. Half of eight PLUS half of one is 4+.5=4.5. What about 90? That IS an even number because it ends in zero, but it has an ODD digit in it, and therefore it makes our brains slow down a bit when cutting it in half. Have no fear! This trick works for numbers ending in zeros too. Think of 90 as (80 + 10). Halve each of those easy numbers and put your results together. Half of eighty PLUS half of ten is 40+5=45. How about 7,000? Same idea here. Change the 7,000 to (6,000 + 1,000) and take half of each of those. Half of 6,000 PLUS half of 1,000 is 3,000+500=3,500 THIRD: Often you will have a mixture of ODD and EVEN digits in a number. Just remember the trick of breaking it up into easy parts, and you will be fine. Let's take a look at a few examples. We will make them harder as we go. Then we will give you a chance to practice before the password clues are given.
YOU TRY THESE:
If you got those right, you are ready to try to find the password to the treasure room. Just follow the directions below. 



To learn even more of these mental math tricks try the book . Listen to samples of Shania Twain's music. Ususally ships in 24 hours.
Copyright © 19992020 themathlab.com 