Download Multiply and divide by 10, 100 or 1000 1b 1c Negative numbers

1b Multiply and divide by 10, 100 or 1000
1c Negative numbers
example
example
a Calculate 7.32 ⫻ 100
b Find the missing number in
84.2 ⫼ ? ⫽ 0.0842
a 7.32 ⫻ 100 ⫽ 732
The digits move two places to the left.
b 84.2 ⫼ 1000 ⫽ 0.0842 The digits have moved three places to the
right, so 84.2 has been divided by 1000.
1 Use number patterns to copy and complete these statements.
⫻ 10 ⫽ 2.5
b 87 ⫼ 10 ⫽
a
0.25 ⫻ ⫽ 25
87 ⫼ ⫽ 0.87
0.25 ⫻ 1000 ⫽
⫼ 1000 ⫽ 0.087
2 Calculate each of these.
a 14 ⫻ 10
c 3 ⫻ 1000
e 2.8 ⫻ 1000
g 34.5 ⫻ 100
b
d
f
h
5 ⫻ 100
5.2 ⫻ 10
4.36 ⫻ 10
0.63 ⫻ 10
3 Calculate each of these.
a 280 ⫼ 10
c 23 000 ⫼ 1000
e 410 ⫼ 100
g 1.9 ⫼ 10
b
d
f
h
5000 ⫼ 100
165 ⫼ 10
52.7 ⫼ 10
846 ⫼ 1000
4 By writing each multiplier as two of its factors, calculate these.
a 5 ⫻ 20 ⫽ 5 ⫻ 2 ⫻ ⫽
b 3 ⫻ 900 ⫽ 3 ⫻ ⫻ 100 ⫽
c 7 ⫻ 40 ⫽ 7 ⫻ ⫻ ⫽
d 11 ⫻ 500 ⫽
e 12 ⫻ 70 ⫽
f 15 ⫻ 400 ⫽
2
Number Multiply and divide by 10, 100 or 1000
Josiah has £100 in his bank account.
What will his balance be if he withdraws £250?
£100 ⫺ £250 ⫽ -£150, so he will be £150 overdrawn.
1 Put these numbers in order from lowest to highest.
a -3
8
4
0
-15
b -24
6
-16
-17
1
c 4
-3
2
3
-9
2 Work out these.
a 5 ⫺ 10
b 9 – 12
e 10 ⫹ -16 f -5 ⫹ -11
i -12 ⫺ -4 j 15 ⫺ -6
c 15 ⫹ -9
g -4 ⫺ -9
k 19 ⫺ -5
d 5 + -9
h -12 ⫺ -16
l -20 ⫺ -8
3 Candace’s bank balance is -£ 250. Find what her balance would
be if she paid in
a £100
b £ 200
c £ 400
d £ 500.
4 Kanika recorded the midday temperature outside her
house on each day of one week.
Monday Tuesday Wednesday Thursday Friday Saturday Sunday
9 °C
4 °C
-2 °C
-5 °C
-3 °C
3 °C
6 °C
a Find the fall in temperature from
i Monday to Tuesday
ii Tuesday to Wednesday
b Find the rise in temperature from
i Thursday to Friday
ii Friday to Saturday
Number Negative numbers
3