Whole Numbers
are any numbers
zero or greater,
not consisting of 
decimals, fractions, or negative numbers.
(Ex: 0, 1, 4, 15, 45, 98 ...)

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Number Lines can help 
to determine which whole numbers are
Greater Than (>) or Less Than (<) others.

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Number Lines can also help 
in solving problems

I IIIIIIIII
 0             1             2              3             4              5             6              7             8              9
                                                                     +1          +1           +1

                                                                      
In adding:
4 + 3 = 7

because starting at 4 and 
moving 3 spaces FORWARD to the RIGHT
would leave you at an answer of 7

I IIIIIIIII
10          11           12            13           14            15           16            17           18          19   
                                                                     -1            -1            -1            -1            -1 

When subtracting:
19 - 5 = 14

because starting at 19 and 
moving 5 spaces BACK to the LEFT
would leave you at an answer of 4

Upon further review:

Number lines can:

* help determine greater than and less than.

* help in solving number problems.

when adding numbers move to the right,
and
when subtracting numbers move to the left.

Let's Practice