Decimal System 1-1 Bridges

Numbers

• Our number system can go up forever.

1000000000 1000 100

1

“INFINITY”

• When you think of Infinity, you think of a really high number…..

• This is NOT ALWAYS TRUE!!!!!

• You can DIVIDE numbers to INFINITY as well!!!! Watch The Number Line:

0

We call this part “zero”

Or this part??

1

2

Or this part???

What do we call this part of the number line? We call this part “one”

Next we have names forthe theregular divisions!! • For numbers BETWEEN numbers, we use theAGAIN!!! DECIMAL SYSTEM. Let’s DIVIDE

1

1.1

1.2

1.3

1.4

1.5

1.6

1.7

1.8

1.9

1.31

1.32

1.33

1.34

1.35

1.36

1.37

1.38

1.39

2

So instead of saying “Somewhere between one and two”… We can say, “Exactly ONE-AND-THREE-TENTHS”

First we DIVIDE UP the number line!!! Now instead of saying “Somewhere But…WHAT ABOUT HERE?????? Between 1.3 and 1.4…..

PLACE VALUE

3457.3269 Each digit stands for a group This digit represents 3,000, or Three-Thousand This digit represents 3/10, or

Three-tenths

• When measuring things, it’s important to know what is equal to 1… …or just 1 SINGLE banana?? Do you mean 1 BUNCH of bananas?

Remember…when adding or subtracting decimal numbers, always line up the dots!

4356.457 +________ 45.63

• Also, if you see a number without a decimal mark…

453

It goes right there

One more thing…. • Just like

00000000000000086 = 86 453.000000000000000 = 453