Multiplying and dividing by 10 and 100 is easy…..

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# Multiplying and dividing by 10 and 100 is easy….. - PowerPoint PPT Presentation

Multiplying and dividing by 10 and 100 is easy…. …when you know how!. Make sure you keep an eye on the place – value markers…they’re REALLY important. Th H T U . t h 3 2 . 1 0

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## PowerPoint Slideshow about 'Multiplying and dividing by 10 and 100 is easy…..' - jacques

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Presentation Transcript

### Multiplying and dividing by 10 and 100 is easy…..

…when you know how!

Make sure you keep an eye on the place – value markers…they’re REALLY important.

Th H T U . t h

3 2 . 1 0

Multiply it by 10, so every digit becomes 10 times BIGGER. EVERY digit moves one place to the LEFT.

Th H T U . t h

3 2 . 1 0

3 2 1 . 0

Lets look at that again…
• We’ll multiply 56.03 by 10.
• Remember what happens to EACH digit.
• Th H T U . t h
• 5 6 . 0 3 X10
• 5 6 0 . 3
• Check that the order of the digits is the same as when you started.
So what happens when you multiply by 100…let’s see
• TH H T U . t h
• 4 6 . 0 2 X 100

4 6 0 2 .

• See! Each digit moves across two places to the left…and of course
• 100 has 2 zeros, so that’s a good reminder. The number becomes 100 times bigger
Now if you make numbers bigger by moving them to the left…what do you think happens when you divide numbers by 10?
• Yes… you move each digit one place to the right, to make it 10 times smaller!
• Like this…
• TH H T U . t h
• 3 5 0 . 0
• 3 5 . 0 0
• REALLY IMPORTANT!!!!!!!!!! See how the decimal point stays inn the same place.
So now you can guess what happens when you divide by 100.
• That’s right, every digit moves two places to the right to make the number 100 times smaller.
• Lets divide 12.6 into 100 bits…wow how tiny would each bit be?
• TH H T U . t h th t.th
• 1 2 . 6 0 divided by 100
• 0 . 1 2 6 0
• So 0.1260 is 100 times smaller than 12.6