By: J’aime Holderbaum
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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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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Rounding to the Nearest TenYou 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 20Because 17 is closer to 20 than 10
Flint 17 miles
continue
Look at these examples. Try to determine what the rule is for rounding to the nearest ten.
12 rounds to 1024 rounds to 2033 rounds to 3051 rounds to 5080 rounds to 8091 rounds to 9043 rounds to 4064 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
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.
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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.
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Look at these examples. Try to determine what the rule is for rounding to the nearest ten.
9 rounds to 1017 rounds to 2025 rounds to 3048 rounds to 5076 rounds to 8088 rounds to 9036 rounds to 40
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.
A
B
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
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• 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.
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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.
50
51
52
53
54
60
59
58
57
56
55
54 rounds to 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.
80
81
82
83
84
90
89
88
87
86
85
87 rounds to 90Click here to continue
Now it’s your turn to round to the nearest ten!
Round 32
35
30
40
A
C
B
Sorry.
Remember the rules:
1. If the number you are rounding is followed by a 0, 1, 2, 3, or 4, then
round down .
2. If the number you are rounding is followed by a 5, 6, 7, 8, or9, then
round up.
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Yes!! You are correct.
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Now it’s your turn to round to the nearest ten!
Round 67
70
100
60
A
B
C
Sorry.
Remember the rules:
1. If the number you are rounding is followed by a 0, 1, 2, 3, or 4, then
round down .
2. If the number you are rounding is followed by a 5, 6, 7, 8, or9, then
round up.
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Yes!! You are correct.
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Now it’s your turn to round to the nearest ten!
Round 25
20
50
30
A
B
C
Sorry.
Remember the rules:
1. If the number you are rounding is followed by a 0, 1, 2, 3, or 4, then
round down .
2. If the number you are rounding is followed by a 5, 6, 7, 8, or9, then
round up.
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Yes!! You are correct.
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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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Rounding to the Nearest Hundred
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
Swartz Creek230 miles
continue
230 is closer to 200
230 rounds to 200
Look at these examples. Try to determine what the rule is for
rounding to the nearest hundred.241 rounds to 200532 rounds to 500333 rounds to 300710 rounds to 700912 rounds to 900829 rounds to 800101 rounds to 100427 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
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.
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.
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Look at these examples. Try to determine what the rule is for
rounding to the nearest hundred.563 rounds to 600179 rounds to 200499 rounds to 500381 rounds to 400262 rounds to 300
958 rounds to 1000674 rounds to 700755 rounds to 800
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.
A
B
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
• 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!
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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.
700
710
720
730
740
800
790
780
770
760
750720 rounds to 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.
300
310
320
330
340
400
390
380
370
360
350
360 rounds to 400 Click here to continue
Now it’s your turn to round to the nearest hundred!
Round 236
200
300
400
A
C
B
Sorry.
Remember the rules:
1. If the number you are rounding is followed by a 0, 1, 2, 3, or 4, then
round down .
2. If the number you are rounding is followed by a 5, 6, 7, 8, or 9, then
round up.
Click here to try again
Yes!! You are correct.
Click here to continue
Round to the nearest hundred.
Round 581
500
550
600
A
B
C
Sorry.
Remember the rules:
1. If the number you are rounding is followed by a 0, 1, 2, 3, or 4, then
round down .
2. If the number you are rounding is followed by a 5, 6, 7, 8, or9, then
round up.
Click here to try again
Yes!! You are correct.
Click here to continue
Round to the nearest hundred.
Round 749
600
700
800
A
B
C
Sorry.
Remember the rules:
1. If the number you are rounding is followed by a 0, 1, 2, 3, or 4, then
round down .
2. If the number you are rounding is followed by a 5, 6, 7, 8, or9, then
round up.
Click here to try again
Yes!! You are correct.
Click here to continue
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.
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Rounding to the Nearest Thousand
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
Posen 2600 miles
continue
2600 rounds to 3000
2600 is closer to 3000 than 2000
Look at these examples. Try to determine what the rule is for
rounding to the nearest thousand.2456 rounds to 20005302 rounds to 50003289 rounds to 30007367 rounds to 70008422 rounds to 80007056 rounds to 70001245 rounds to 10009135 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
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.
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
Look at these examples. Try to determine what the rule is for
rounding to the nearest thousand.4589 rounds to 50006900 rounds to 70003682 rounds to 40002766 rounds to 30001805 rounds to 20005693 rounds to 60008954 rounds to 90007725 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
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
• 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
Let’s 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.
6000
6100
6200
6300
6400
7000
6900
6800
6700
6600
6500
6300 rounds to 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.
2000
2100
2200
2300
2400
3000
2900
2800
2700
2600
2500
2900 rounds to 3000Click here to continue
Now it’s your turn to round to the nearest thousand!
Round 5798
5800
6000
5000
A
C
B
Sorry.
Remember the rules:
1. If the number you are rounding is followed by a 0, 1, 2, 3, or 4, then
round down .
2. If the number you are rounding is followed by a 5, 6, 7, 8, or9, then
round up.
Click here to try again
Yes!! You are correct.
Click here to continue
Now it’s your turn to round to the nearest thousand!
Round 2045
2000
2050
2100
A
B
C
Sorry.
Remember the rules:
1. If the number you are rounding is followed by a 0, 1, 2, 3, or 4, then
round down .
2. If the number you are rounding is followed by a 5, 6, 7, 8, or9, then
round up.
Click here to try again
Yes!! You are correct.
Click here to continue
Now it’s your turn to round to the nearest thousand!
Round 9430
8430
8400
9000
A
B
C
Sorry.
Remember the rules:
1. If the number you are rounding is followed by a 0, 1, 2, 3, or 4, then
round down .
2. If the number you are rounding is followed by a 5, 6, 7, 8, or 9, then
round up.
Click here to try again
Yes!! You are correct.
Click here to continue
For more practice rounding to the nearest ten click the link!http://www.aaamath.com/g4-32-round10.html#section2
For more practice rounding to the nearest hundred click the link!http://www.aaamath.com/g4-32-round100.html#section2
For more practice rounding to the nearest thousand click the link!http://www.aaamath.com/g41c-round1000.html#section2
You’re Finished!!Click the button below to start the presentation
again!
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