By: J

1
Rounding Numbers to the Nearest Ten, Hundred,
and Thousand

• By Jaime Holderbaum

2

• Rounding Numbers to the Nearest
• Ten, Hundred, and Thousand
• Project Title Rounding Numbers
• Audience
• This presentation is for third grade students.
• Instructional Objectives
• MAT.IV.1.E2 Investigate and develop an
  understanding of the base ten place value system
• Round whole numbers to the nearest thousand

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3
What is rounding numbers?

• You can estimate when you need to know about how
  many or about how much. Rounding is one way to
  estimate.

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4
Rounding to the Nearest Ten

• You estimate which ten the number you are
  rounding is closest to. If you saw a road sign
  that said Flint was 17 miles away, then you could
  say that Flint is about 20 miles away.
• 10 11 12 13 14 15
  16 17 18 19 20
• 17 rounds to 20
• Because 17 is closer to 20 than 10

Flint 17 miles
continue
5
Look at these examples. Try to determine what
the rule is for rounding to the nearest ten.

• 12 rounds to 10
• 24 rounds to 20
• 33 rounds to 30
• 51 rounds to 50
• 80 rounds to 80
• 91 rounds to 90
• 43 rounds to 40
• 64 rounds to 60

• Choose the rule
• If the number in the ones column is 0, 1, 2, 3,
  or 4 then round up to the greater ten.
• If the number in the ones column is 0,1,2,3, or
  4, then round down to the lesser ten.

A
B
6

• Sorry.
• Look at the numbers in the ones column. Do they
  cause the number to be rounded to the lesser ten
  or the greater ten.

Click here to try again.
7

• Yes!! You are correct. When a number has a 0,
  1, 2, 3, or 4 in the ones column you round to the
  lesser ten! For example 83 rounds to 80.

Click here to continue
8
Look at these examples. Try to determine what
the rule is for rounding to the nearest ten.

• Choose the rule
• If the number in the ones column is 5, 6, 7, 8,
  or 9 then round up to the greater ten.
• If the number in the ones column is 5, 6, 7, 8,
  or 9 then round down to the lesser ten.

• 9 rounds to 10
• 17 rounds to 20
• 25 rounds to 30
• 48 rounds to 50
• 76 rounds to 80
• 88 rounds to 90
• 36 rounds to 40

A
B
9

• Sorry.
• Look at the numbers in the ones column. Do they
  cause the number to be rounded to the lesser ten
  or the greater ten

Click here to try again
10

• Yes!! You are correct. When a number has a 0,
  1, 2, 3, or 4 in the ones column you round to the
  lesser ten! For example 83 rounds to 80.

Click here to continue
11
Think of rounding like a car going over a hill.
If you are to round 54 to the nearest ten, then
your choices are either round back to 50 or up to
60. You always need to look at the number in the
ones column. If the car goes up to 54 and stops,
then it will roll back to 50.
54 rounds to 50
Click here to continue
55
54
53
56
57
52
58
51
59
60
50
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Here is another example. If you are to round 87
to the nearest ten, then your choices are either
round back to 80 or up to 90. If the car goes to
87 and stops, then it will roll to 90.
87 rounds to 90
Click here to continue
85
84
83
86
87
82
88
81
89
90
80
13
Now its your turn to round to the nearest ten!
Round 32 35 30 40
A
B
C
14

• Sorry.
• Remember the rules
• If the number you are rounding is followed by a
  0, 1, 2, 3, or 4, then round down .
• If the number you are rounding is followed by a
  5, 6, 7, 8, or9, then round up.

Click here to try again
15
Yes!! You are correct.
Click here to continue
16
Now its your turn to round to the nearest ten!

• Round 67
• 70
• 100
• 60

A
B
C
17

• Sorry.
• Remember the rules
• If the number you are rounding is followed by a
  0, 1, 2, 3, or 4, then round down .
• If the number you are rounding is followed by a
  5, 6, 7, 8, or9, then round up.

Click here to try again
18
Yes!! You are correct.
Click here to continue
19
Now its your turn to round to the nearest ten!
Round 25 20 50 30
A
B
C
20

• Sorry.
• Remember the rules
• If the number you are rounding is followed by a
  0, 1, 2, 3, or 4, then round down .
• If the number you are rounding is followed by a
  5, 6, 7, 8, or9, then round up.

Click here to try again
21
Yes!! You are correct.
Click here to continue
22
Next you will learn about rounding to the nearest
hundred.

• When rounding to the nearest hundred, you are
  finding out which hundred a number is closest to.
  

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23
Rounding to the Nearest Hundred
Swartz Creek 230 miles

• You estimate which hundred the number you are
  rounding is closest to. If you saw a road sign
  that said Swartz Creek was 230 miles away, then
  you could say that Swartz Creek is about 200
  miles away.
• 200 210 220 230 240 250
  260 270 280 290 300

230 is closer to 200 230 rounds to 200
continue
24
Look at these examples. Try to determine what
the rule is for rounding to the nearest hundred.

• 241 rounds to 200
• 532 rounds to 500
• 333 rounds to 300
• 710 rounds to 700
• 912 rounds to 900
• 829 rounds to 800
• 101 rounds to 100
• 427 rounds to 400

• Choose the rule
• If the number in the tens column is 0, 1, 2, 3,
  or 4 then round up to the greater hundred.
• If the number in the tens column is 0,1,2,3, or
  4, then round down to the lesser hundred.

A
B
25

• Sorry.
• Look at the numbers in the tens column. Do they
  cause the number to be rounded to the lesser
  hundred or the greater hundred?

Click here to try again.
26

• Yes!! You are correct. When a number has a 0,
  1, 2, 3, or 4 in the tens column you round to the
  lesser hundred! For example 429 rounds to 400.

Click here to continue
27
Look at these examples. Try to determine what
the rule is for rounding to the nearest hundred.

• Choose the rule
• If the number in the tens column is 5, 6, 7, 8,
  or 9 then round up to the greater hundred.
• If the number in the tens column is 5, 6, 7, 8,
  or 9 then round down to the lesser hundred.

• 563 rounds to 600
• 179 rounds to 200
• 499 rounds to 500
• 381 rounds to 400
• 262 rounds to 300
• 958 rounds to 1000
• 674 rounds to 700
• 755 rounds to 800

A
B
28

• Sorry.
• Look at the numbers in the tens column. Do they
  cause the number to be rounded to the lesser
  hundred or the greater hundred?

Click here to try again
29

• Yes!! You are correct. When a number has a 5,
  6, 7, 8, or 9 in the tens column you round to the
  greater hundred!

Click here to continue
30
Remember the example of the car going over the
hill.When rounding to the nearest hundred, any
number that ends in 49 or less will cause the car
to roll back to the lesser hundred and any number
that ends in 50 or greater, will cause the car to
roll up to the greater hundred.If you round 720
to the nearest ten, then your choices are either
round back to 700 or up to 800. If the car goes
up to 720 and stops, then it will roll back to
700.
Click here to continue
720 rounds to 700
750
740
730
760
770
720
780
710
790
800
700
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Here is another example. If you round 360 to
the nearest hundred, then your choices are either
round back to 300 or up to 400. If the car goes
to 360 and stops, then it will roll to 400.
Click here to continue
360 rounds to 400
350
340
330
360
370
320
380
310
390
400
300
32
Now its your turn to round to the nearest
hundred!
Round 236 200 300 400
A
B
C
33

• Sorry.
• Remember the rules
• If the number you are rounding is followed by a
  0, 1, 2, 3, or 4, then round down .
• If the number you are rounding is followed by a
  5, 6, 7, 8, or 9, then round up.

Click here to try again
34
Yes!! You are correct.
Click here to continue
35
Round to the nearest hundred.

• Round 581
• 500
• 550
• 600

A
B
C
36

• Sorry.
• Remember the rules
• If the number you are rounding is followed by a
  0, 1, 2, 3, or 4, then round down .
• If the number you are rounding is followed by a
  5, 6, 7, 8, or9, then round up.

Click here to try again
37
Yes!! You are correct.
Click here to continue
38
Round to the nearest hundred.
Round 749 600 700 800
A
B
C
39

• Sorry.
• Remember the rules
• If the number you are rounding is followed by a
  0, 1, 2, 3, or 4, then round down .
• If the number you are rounding is followed by a
  5, 6, 7, 8, or9, then round up.

Click here to try again
40
Yes!! You are correct.
Click here to continue
41
Last you will learn to round to the nearest
thousand!

• When you round to the nearest thousand you are
  estimating which thousand the number is closest
  to.

Click here to continue
42
Rounding to the Nearest Thousand
Posen 2600 miles

• You estimate which thousand the number you are
  rounding is closest to. If you saw a road sign
  that said Posen was 2600 miles away, then you
  could say that Posen is about 3000 miles away.
• 2000 2100 2200 2300 2400 2500 2600
  2700 2800 2900 3000

2600 rounds to 3000 2600 is closer to 3000 than
2000
continue
43
Look at these examples. Try to determine what
the rule is for rounding to the nearest thousand.

• 2456 rounds to 2000
• 5302 rounds to 5000
• 3289 rounds to 3000
• 7367 rounds to 7000
• 8422 rounds to 8000
• 7056 rounds to 7000
• 1245 rounds to 1000
• 9135 rounds to 9000

• Choose the rule
• If the number in the hundreds column is 0, 1, 2,
  3, or 4 then round up to the greater thousand.
• If the number in the hundreds column is 0,1,2,3,
  or 4, then round down to the lesser thousand.

A
B
44

• Sorry.
• Look at the numbers in the hundreds column. Do
  they cause the number to be rounded to the lesser
  thousand or the greater thousand?

Click here to try again.
45

• Yes!! You are correct. When a number has a 0,
  1, 2, 3, or 4 in the hundreds column you round to
  the lesser thousand! For example 8368 rounds to
  8000.

Click here to continue
46
Look at these examples. Try to determine what
the rule is for rounding to the nearest thousand.

• 4589 rounds to 5000
• 6900 rounds to 7000
• 3682 rounds to 4000
• 2766 rounds to 3000
• 1805 rounds to 2000
• 5693 rounds to 6000
• 8954 rounds to 9000
• 7725 rounds to 8000

• Choose the rule
• If the number in the hundreds column is 5, 6, 7,
  8, or 9 then round up to the greater thousand.
• If the number in the hundreds column is 5, 6, 7,
  8, or 9 then round down to the lesser thousand.

A
B
47

• Sorry.
• Look at the numbers in the hundreds column. Do
  they cause the number to be rounded to the lesser
  thousand or the greater thousand?

Click here to try again
48

• Yes!! You are correct. When a number has a 5,
  6, 7, 8, or 9 in the hundreds column you round to
  the greater thousand!

Click here to continue
49
Lets look at the hill again. If you are to
round 6300 to the nearest thousand, then your
choices are either round back to 6000 or up to
7000. If the car goes up to 6300 and stops, then
it will roll back to 6000.
6300 rounds to 6000
Click here to continue
6500
6400
6300
6600
6700
6200
6800
6100
6900
7000
6000
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Here is another example. If you are to round
2900 to the nearest thousand, then your choices
are either round back to 2000 or up to 3000. If
the car goes to 2900 and stops, then it will roll
to 3000.
2900 rounds to 3000
Click here to continue
2500
2400
2300
2600
2700
2200
2800
2100
2900
3000
2000
51
Now its your turn to round to the nearest
thousand!
Round 5798 5800 6000 5000
A
B
C
52

• Sorry.
• Remember the rules
• If the number you are rounding is followed by a
  0, 1, 2, 3, or 4, then round down .
• If the number you are rounding is followed by a
  5, 6, 7, 8, or9, then round up.

Click here to try again
53
Yes!! You are correct.
Click here to continue
54
Now its your turn to round to the nearest
thousand!

• Round 2045
• 2000
• 2050
• 2100

A
B
C
55

• Sorry.
• Remember the rules
• If the number you are rounding is followed by a
  0, 1, 2, 3, or 4, then round down .
• If the number you are rounding is followed by a
  5, 6, 7, 8, or9, then round up.

Click here to try again
56
Yes!! You are correct.
Click here to continue
57
Now its your turn to round to the nearest
thousand!
Round 9430 8430 8400 9000
A
B
C
58

• Sorry.
• Remember the rules
• If the number you are rounding is followed by a
  0, 1, 2, 3, or 4, then round down .
• If the number you are rounding is followed by a
  5, 6, 7, 8, or 9, then round up.

Click here to try again
59
Yes!! You are correct.
Click here to continue
60
For more practice rounding to the nearest ten
click the link! http//www.aaamath.com/g4-32-round
10.htmlsection2 For more practice rounding to
the nearest hundred click the link! http//www.aaa
math.com/g4-32-round100.htmlsection2 For more
practice rounding to the nearest thousand click
the link! http//www.aaamath.com/g41c-round1000.ht
mlsection2 Youre Finished!! Click the button
below to start the presentation again!
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