D.L.M.R. - Work Smart, Not Hard!
Review...
Remember DLMR. Here's some suggestions for DLMR...
When multiplying or dividing numbers containing decimals by 10, 100, 1000, etc., there's no need for long division or multiplication. You need only MOVE the decimal place.
We move one place for every zero (0) in the 10, 100, 1000, 10,000, etc.
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D.L.M.R tells us that when we divide by 10, 100,
1000, etc., we move the decimal
left
and when we multiply, we move the decimal
right
We move one place for every zero (0) in the 10, 100, 1000, 10,000, etc.
So...2.70 x 100 was 270. How about 2.3 x 10,000?
In the example above, we are multiplying by 10,000. There are 4 zeroes. We need to move the decimal 4 places to the...............................................right. But there is only the one decimal place (the .3). What now?
Captain Zero to the rescue.
Is he a bird? A plane? No - he's one big zero. You may know him. You may have seen him. He fires blanks. As many as you need. Tack them onto the right of the 2.3
2.3 0 0 0 x 10,000 = 23,000. (Move the decimal place 4 spaces to the right. One for each zero in 10,000.) We move to the right when we multiply.
More examples, covering some trickier problems, will follow in the next postings.
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