Question 165375: How is 4 + 5 illustrated on a number line?
Answer by gonzo(654)   (Show Source):
You can put this solution on YOUR website! go to this internet address and it will show you how number lines work.
you click on addition or subtraction of multiplication or division and it will give you many example.
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http://nlvm.usu.edu/en/nav/frames_asid_156_g_1_t_1.html?open=activities
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just copy that and paste it in your address bar.
basically the number line works as follows:
your equation is 4 + 5.
that's the same as +4 and +5.
your number line is numbered from 0 to 10 (should be sufficient for this operation)
i consider each number a stop.
your first number is + 4, so you start from 0 and go to the right 4 stops.
you will land on the number 4.
your second number is + 5, so you start from the number 4 and go to the right 5 stops.
you will land on the number 9.
it's hard to show here, but i'll try:
here's your number line
0---1---2---3---4---5---6---7---8---9---10---11---12
you start from 0 and go to the right 4 stops. you will land on the number 4.
----|---|---|--->
you start from the number 4 and go to the right 5 stops. you will land on the number 9.
----|---|---|--->---|---|---|---|--->
since you went to the right 4 and then to the right another 5, you landed on 9, so 4 + 5 = 9
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if you can copy that internet address into your address bar and go there you should be able to see many more examples.
that internet address is again:
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http://nlvm.usu.edu/en/nav/frames_asid_156_g_1_t_1.html?open=activities
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they will have +, -, *, / buttons.
click on + and then click on "go" and the solution will appear on the number line.
you can do the same for any of the other operations.
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