Rounding Numbers Practice Questions
There are 400 people in
my village.
Last year I earnt £23,000.
You need 100 g of flour
to make 12 cupcakes.
I own 7 pets.
There are 30 students
in my class.
W
h
i
c
h
o
f
t
h
e
s
e
n
u
m
b
e
r
s
a
r
e
p
r
o
b
a
b
l
y
e
s
t
i
m
a
t
e
s
?
There are 400 people in
my village.
W
e
o
f
t
e
n
r
o
u
n
d
n
u
m
b
e
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i
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v
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r
y
d
a
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s
p
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c
h
.
I
t
i
s
p
o
s
s
i
b
l
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t
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e
r
e
a
r
e
e
x
a
c
t
l
y
4
0
0
p
e
o
p
l
e
i
n
t
h
e
v
i
l
l
a
g
e
,
but how many could there be?
399
350
450
401
424
462
340
387
410
There are 400 people in
my village.
W
o
l
l
a
t
o
n
Exact population = 350
Who has rounded their number correctly?
A
l
v
a
s
t
o
n
Exact population = 450
There are 400 people in
my village.
There are about
2
0
s
t
u
d
e
n
t
s
i
n
m
y
c
l
a
s
s
.
There are exactly 25 students in the class.
Who has rounded the number correctly?
There are about
3
0
s
t
u
d
e
n
t
s
i
n
m
y
c
l
a
s
s
.
On your whiteboards..
7 questions
1
0
2
0
0
5
15
1. Round 15 to the nearest 10.
20
1
0
2
0
0
5
15
Round 12 to the nearest 10.
10
4
0
5
0
3
0
35
45
2. Round 36 to the nearest 10.
40
6
0
7
0
5
0
55
65
3. Round 55 to the nearest 10.
60
4
0
0
5
0
0
3
0
0
350
450
4. Round 324 to the nearest 100.
300
3
0
0
3
0
0
2
0
0
250
350
5. Round 252 to the nearest 100.
300
7
0
0
8
0
0
6
0
0
650
750
6. Round 650 to the nearest 100.
700
1
2
1
0
1
2
2
0
1
2
0
0
1205
1215
7. Round 1215 to the nearest 10.
1220
Q1. Round these numbers
to the nearest 10.
Q2. Round these numbers
to the nearest 100.
T
i
t
l
e
:
R
o
u
n
d
i
n
g
n
u
m
b
e
r
s
t
o
t
h
e
n
e
a
r
e
s
t
1
0
Use the number lines to round each number.
30
50
50
20
70
120
Use the number lines to round each number.
300
200
400
400
500
500
Q
3
.
W
h
i
c
h
1
0
i
n
t
e
g
e
r
s
r
o
u
n
d
t
o
7
0
0
t
o
t
h
e
n
e
a
r
e
s
t
1
0
0
a
n
d
6
7
0
t
o
t
h
e
n
e
a
r
e
s
t
1
0
?
Q
4
.
W
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c
h
5
i
n
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e
g
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r
s
r
o
u
n
d
t
o
3
0
0
t
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n
e
a
r
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s
t
1
0
0
a
n
d
2
5
0
t
o
t
h
e
n
e
a
r
e
s
t
1
0
?
Q
5
.
W
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c
h
5
i
n
t
e
g
e
r
s
r
o
u
n
d
t
o
4
0
0
t
o
t
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n
e
a
r
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s
t
1
0
0
a
n
d
4
5
0
t
o
t
h
e
n
e
a
r
e
s
t
1
0
?
Q
6
.
W
h
i
c
h
5
i
n
t
e
g
e
r
s
r
o
u
n
d
t
o
8
0
0
t
o
t
h
e
n
e
a
r
e
s
t
1
0
0
a
n
d
8
5
0
t
o
t
h
e
n
e
a
r
e
s
t
1
0
?
Q
7
.
T
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e
d
i
f
f
e
r
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n
c
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b
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t
w
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n
t
w
o
i
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t
e
g
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r
s
i
s
2
.
W
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a
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t
1
0
0
t
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s
1
0
0
.
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c
o
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l
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n
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b
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s
b
e
?
Q
3
.
W
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h
1
0
i
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t
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g
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s
r
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u
n
d
t
o
7
0
0
t
o
t
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n
e
a
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s
t
1
0
0
a
n
d
6
7
0
t
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n
e
a
r
e
s
t
1
0
?
6
6
5
,
6
6
6
…
.
6
7
4
Q
4
.
W
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h
5
i
n
t
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g
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r
s
r
o
u
n
d
t
o
3
0
0
t
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t
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a
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s
t
1
0
0
a
n
d
2
5
0
t
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n
e
a
r
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s
t
1
0
?
2
5
0
,
2
5
1
…
2
5
4
Q
5
.
W
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h
5
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d
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4
0
0
t
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a
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1
0
0
a
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d
4
5
0
t
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n
e
a
r
e
s
t
1
0
?
4
4
5
,
4
4
6
…
4
5
0
Q
6
.
W
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h
5
i
n
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g
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d
t
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8
0
0
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a
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1
0
0
a
n
d
8
5
0
t
o
t
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n
e
a
r
e
s
t
1
0
?
8
4
5
,
8
4
6
,
…
8
5
0
Q
7
.
T
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e
d
i
f
f
e
r
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n
c
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b
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t
w
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n
t
w
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g
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r
s
i
s
2
.
W
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a
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t
1
0
0
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s
1
0
0
.
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l
d
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n
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m
b
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r
s
b
e
?
4
9
&
5
1
Q8. Complete the following. The first question has been done for you
.
T
o
f
i
n
i
s
h
…
Acknowledgements: Go Teach Maths
Further resources/tasks can be found here: https://www.goteachmaths.co.uk/rounding-whole-numbers/
Series of questions on rounding numbers to the nearest 10 or 100. Test your skills in rounding various numbers correctly. From village populations to student counts, sharpen your rounding abilities with these practice questions.
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Presentation Transcript
There are 400 people in my village. There are 30 students in my class. You need 100 g of flour to make 12 cupcakes. I own 7 pets. Last year I earnt 23,000. Which of these numbers are probably estimates?
There are 400 people in my village. We often round numbers in everyday speech. It is possible there are exactly 400 people in the village, but how many could there be? 399 350 462 387 340 410 424 450 401
Wollaton Exact population = 350 Alvaston Exact population = 450 There are 400 people in my village. There are 400 people in my village. Who has rounded their number correctly? 300 400 500 350 450 If we want to round a number & it is halfway between two possible values, we round UP.
There are exactly 25 students in the class. There are about 20 students in my class. There are about 30 students in my class. Who has rounded the number correctly? 10 20 30 15 25 If we want to round a number & it is halfway between two possible values, we round UP.
On your whiteboards.. 7 questions 1. Round 15 to the nearest 10. 20 0 10 20 5 15
Round 12 to the nearest 10. 10 0 10 20 5 15
2. Round 36 to the nearest 10. 40 30 40 50 35 45
3. Round 55 to the nearest 10. 60 50 60 70 55 65
4. Round 324 to the nearest 100. 300 300 400 500 350 450
5. Round 252 to the nearest 100. 300 200 300 300 250 350
6. Round 650 to the nearest 100. 700 600 700 800 650 750
7. Round 1215 to the nearest 10. 1220 1200 1210 1220 1205 1215
Title: Rounding numbers to the nearest 10 Q2. Round these numbers to the nearest 100. Q1. Round these numbers to the nearest 10. Rounded Number 20 Rounded Number 300 Number Number 33 260 45 50 232 200 52 50 355 400 24 20 389 400 65 70 512 500 115 120 450 500 205 210 199 200 314 310 44 0
Q3. Which 10 integers round to 700 to the nearest 100 and 670 to the nearest 10? Q4. Which 5 integers round to 300 to the nearest 100 and 250 to the nearest 10? Q5. Which 5 integers round to 400 to the nearest 100 and 450 to the nearest 10? Q6. Which 5 integers round to 800 to the nearest 100 and 850 to the nearest 10? Q7. The difference between two integers is 2. When rounded to the nearest 100 the difference is 100. What could the numbers be?
Q3. Which 10 integers round to 700 to the nearest 100 and 670 to the nearest 10? 665, 666 . 674 Q4. Which 5 integers round to 300 to the nearest 100 and 250 to the nearest 10? 250, 251 254 Q5. Which 5 integers round to 400 to the nearest 100 and 450 to the nearest 10? 445, 446 450 Q6. Which 5 integers round to 800 to the nearest 100 and 850 to the nearest 10? 845, 846, 850 Q7. The difference between two integers is 2. When rounded to the nearest 100 the difference is 100. What could the numbers be? 49 & 51
Q8. Complete the following. The first question has been done for you.
To finish ? ? = 2 When a and b are rounded to the nearest 10 they are both 10. What is the range of possible values for a? What is the range of possible values for b? Try and draw a diagram to explain your reasoning
