Thursday, July 17, 2014

Whole Number Divided by Decimals

Preview

Dividing a whole number by a decimal looks complicated but its really easy once you practice it. Let's take the whole number 50 and lets divide it by 2.5. So what we need to do is put this problem in division form:
      ____
2.5/ 50

The first thing we need to do is make 2.5 into a whole number because thatis the rule when dividing with a decimal divisor:

  2.5
x1 0
  0 0
+2 5
  2 5

So now we have the whole number 25 and since we multiplied 2.5 by 10 we have to do the same thing with 50 like this:

50  x 10 =500
2.5 x 10 = 25

So the next thing we have to do is divide 500 by 25:

     __20_       25x20=500
25/ 500
    - 500
          0

So now we know that 50/2.5=20.
Now try some of these and make sure to watch the video on YouTube.




Sheet 1 Whole Numbers Divided by Decimals










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