rounding numbers to the closest ten by debbie wilks
TRANSCRIPT
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Rounding Numbersto the
Closest Ten
by Debbie Wilks
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When you find the ten that is closest to a number, you are
rounding.
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For example, 40 is the closest ten to 36.
So, 36 is rounded to 40.
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Let’s think about a number line like a
roller coaster.
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You might think about a number line that
looks like this:
10 3020
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On this number line, what number would come half way between 10 and 20?
10 3020
15
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What number would come half way between 20 and
30?
10 3020
15
25
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What ten would be next?
10 30
20
15 25 35
40
What number would be half way between?
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Can you guess about where 17 would be
on this number line?
10
30
20
15 25 35
40
17
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10
30
20
15 25 35
40
17
If the roller coaster stopped, what number
would it roll to?
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Can you guess about where 23 would be
on this number line?
10
30
20
15 25 35
40
23
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10
30
20
15 25 35
40
23
If the roller coaster stopped, what number
would it roll to?
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Can you guess about where 36 would be
on this number line?
10
30
20
15 25 35
40
36
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What would you round it to?
10
30
20
15 25 35
40
36
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Can you guess about where 41 would be
on this number line?
10
30
20
15 25 35
40
41
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What would you round it to?
10
30
20
15 25 35
40
41
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Can you guess about where 19 would be
on this number line?
10
30
20
15 25 35
40
19
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Can you guess about where 19 would be
on this number line?
10
30
20
15 25 35
40
19
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10
30
20
15 25 35
40
19
What would you round it to?
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What about a number like 25? It’s right in the middle!
10
30
20
15 25 35
40
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Our rule is to round to the next ten.
10
30
20
15 25 35
40
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10
30
20
15 25 35
40
Tell a number that would round to 10.
1112
1314
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When you round to the closest ten, look in the ones place.
If it has 1,2,3, or 4 round down.If it has 5, 6 ,7, 8, or 9 round up.
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To round remember this rhyme,
5, 6, 7, 8, 9
GO UP all the time!!
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Rounding numbers is so fun,We will do it 'till we're done.
If a number's 1-4,Round it down right through the
floor.If a number's 5-9,
Round it up it is just fine. Round up,
Round down, 1,2,3,4 --- 1-2, 3-4
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Now it’s your turn!
You can get some help from the number line.
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What ten is closest to 56?
Put your bean on the closest ten.
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What ten is closest to 79?
Put your bean on the closest ten.
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What ten is closest to 83?
Put your bean on the closest ten.
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What ten is closest to 99?
Put your bean on the closest ten.
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What ten is closest to 65?
Put your bean on the closest ten.
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What ten is closest to 94?
Put your bean on the closest ten.
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Are you roller
coaster ready for an assignment
?