Number Lines
Draw a number line on your write board that shows the number 0-100 by skip counting by 5s.
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0 5 10 15 20 25 30 35 40 45 50 55 60
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65 70 75 80 85 90 95 100
What is the halfway number between 20 and 40?
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20 22 24 26 28 30 32 34 36 38 40
30
Round 38 to the nearest ten using any strategy.
40
Round 89 to the nearest hundred using any strategy.
100
Use the rounding mountain to round 327 to the nearest ten.
330
Draw a number line from 20-30. Put a dot on the number 24.
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20 21 22 23 24 25 26 27 28 29 30
Draw a number line to show the halfway number between 0 and 20.
Round 61 to the nearest ten using any strategy.
60
Round 328 to the nearest hundred using any strategy.
300
Round 5,723 to the nearest thousand with any strategy.
6,000
What are the missing numbers?
0, 4, 8, ___, ____, 20, ____, 28
12, 16, 24
Draw a number line to show the halfway number between 50 and 100.
75
Round 95 to the nearest ten. using any strategy
100
Round 778 to the nearest hundred using the rounding mountain.
800
What number is halfway between 550 and 600? Use a number line if you would like.
575
What does a number line show? What can you use a number line for?
The order of the numbers in a given sequence.
You can use a number line to count, skip count, find halfway numbers, and round.
What number is halfway between 0 and 100?
50
Round 429 to the nearest ten using the rounding mountain.
430
Round 850 to the nearest hundred using any strategy.
900
If a number ends in 5, 6, 7, 8, or 9, do we round up or down?
Round up
Draw a number line that shows the halfway number between 1,500 and 3,500.
2,500
What is the halfway number between 200 and 400?
300
Round 733 to the nearest ten using a number line.
730
Round 4,823 to the nearest hundred using a number line.
4,800
Round 693 to the nearest ten with a number line. Explain why you rounded to the number that you did.
690 because 693 is closer to 690 than it is to 700. Also, 693 ends in a 3, so we round down.