1. Powers of 10
Add 1 to the power
Subtract 1 from the power
104
103
102 10 1
100
10-1
10-2 10 1
0.1
100
0.01
10000
1000
Multiply by 10
Divide by 10

2. Division always makes numbers smaller
TRUE OR FALSE?
Division always makes numbers smaller
Multiplication always makes numbers bigger
Class votes

3. Try multiplying and dividing the numbers on the left hand side by those on the right hand side.
Investigate
0.6 25
0.23
62.5
800
0.09
1.5
0.1
1/100
0.01 10
100
1/10 x
Demonstrate use of table to collate results ÷

4. Organise your findings into a table:
Multiply
Divide
0.1
1/10 10
0.01
1/100
100 x y

5. What can you see? Multiply Divide 0.09 0.23 0.6 1.5 25 62.5 800 0.1
1/10 10
0.01
1/100
100
0.09
0.23
0.6
1.5 25
62.5
800
What can you see?

6. 0.1 0.01 1/10 1/100 10 100 0.1 0.01 Multiplying by Dividing by
Is the same as
Is the same as
Multiplying by
Dividing by
0.1
0.01
1/10
1/100 10
100
Is the same as
Is the same as
Dividing by
Multiplying by
0.1
0.01

7. Multiplying and dividing by powers of 10
7.34 x 100 =
734
37.4 / 10 =
3.74
9.3 x 0.1 =
9.3 / 10 =
0.93
0.27 / 0.1 =
0.27 x 10 =
2.7
0.63 x 0.01 =
0.63 / 100 =
0.0063
5.96 / 0.01 =
5.96 x 100 =
596

8. Multiplying by a number less than 1 makes things smaller.
What did you find out?
Multiplying by a number less than 1 makes things smaller.
Dividing by a number less than 1 makes things bigger