Download Models and Examples More Examples Guided Practice 0 10 20 30

Name
Round to the Nearest 10
Models and Examples
A number line can help you understand rounding.
0
10
20
When you round to the nearest 10, think
30
40
Which ten is closest?
Round 37 to the nearest 10.
37
Step 1 Find 37 on the number line.
30
35
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20
↓
40
Step 2 Decide, is 37 closer to 30 or closer to 40?
37 is closer to 40. So 37 rounds up to 40.
More Examples
Round 25 to the nearest 10.
25
Step 1 Find 25 on the number line.
10
↓
20
30
Step 2 25 is the same distance from 20 and 30!
Numbers that have a 5 in the ones place always round up to
the next higher 10. So 25 rounds to 30.
Sometimes the
nearest 10 is 0.
Guided Practice
Round to the nearest 10.
19 rounds to
23 rounds to
2 rounds to
67 rounds to
14 rounds to
4 rounds to
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PLACE VALUE • Vol. 1• Whole Numbers
Rounding to the Nearest 10
IL Workbook C
33
Name
Round to the Nearest 10
Practice
Round each number to the nearest 10.
10
20
30
5 rounds to
39 rounds to
4 rounds to
34 rounds to
23 rounds to
25 rounds to
80
90
100
110
83 rounds to
104 rounds to
96 rounds to
105 rounds to
99 rounds to
114 rounds to
40
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0
120
Which do not round to the given number, when rounding to the nearest 10?
30
25
29
31
35
50
51
53
49
44
100
85
95
105
96
Critical Thinking
True or False? Explain.
If your number is half way to the next 10, round up.
If your number is one-third of the way to the next 10, round up.
If your number has a 1, 2, 3, or 4 in the one’s place,
the closest 10 is to the left on the number line.
34 IL Workbook C
PLACE VALUE • Vol. 1• Whole Numbers
Rounding to the Nearest 10
© CSL Associates, Inc. (877) 790-7915
Rounding to the Nearest 10
1A−2A
4 rounds to
10
14 rounds to
Rounding to the Nearest 10
IL Workbook C
0
70
20
33
Sometimes the
nearest 10 is 0.
PLACE VALUE • Vol. 1• Whole Numbers
67 rounds to
0
2 rounds to
© CSL Associates, Inc. (877) 790-7915
23 rounds to
20
19 rounds to
Round to the nearest 10.
Guided Practice
Numbers that have a 5 in the ones place always round up to
the next higher 10. So 25 rounds to 30.
Step 2 25 is the same distance from 20 and 30!
Step 1 Find 25 on the number line.
Round 25 to the nearest 10.
37 is closer to 40. So 37 rounds up to 40.
More Examples
Which ten is closest?
Step 2 Decide, is 37 closer to 30 or closer to 40?
Step 1 Find 37 on the number line.
Round 37 to the nearest 10.
When you round to the nearest 10, think
23 rounds to
4 rounds to
5 rounds to
104 rounds to
105 rounds to
114 rounds to
80
100
100
25 rounds to
20
34 rounds to
0
39 rounds to
0
110
100
100
30
30
40
34 IL Workbook C
Rounding to the Nearest 10
PLACE VALUE • Vol. 1• Whole Numbers
If your number has a 1, 2, 3, or 4 in the one’s place,
the closest 10 is to the left on the number line.
© CSL Associates, Inc. (877) 790-7915
true
false
If your number is one-third of the way to the next 10, round up.
true
If your number is half way to the next 10, round up.
True or False? Explain.
Critical Thinking
160'515+(($3(45
Which do not round to the given number, when rounding to the nearest 10?
99 rounds to
96 rounds to
83 rounds to
Round each number to the nearest 10.
Practice
$2>6
A number line can help you understand rounding.
160'515+(($3(45
Copyright ©CSL Associates, Inc. For more practice, visit us at www.mathcoachinteractive.com
Models and Examples
$2>6
Answer Key
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