Know Your Numbers: How to Double

In this worksheet, students work out what comes out of or goes in to a Doubling Machine.

Key stage:  KS 1

Curriculum topic:   Number: Multiplication and Division

Curriculum subtopic:   Solve Multiplication/Division Problems

Difficulty level:

QUESTION 1 of 10

In this worksheet, you must work out what went in or what comes out of a Doubling Machine.

Here 6 x 2 = 12, so when 6 goes in, 12 comes out.

Also 12 ÷ 2 = 6, so when 12 comes out, 6 must have gone in.

Remember that...

Doubling is the same as multiplying by 2.

Halving is the same as dividing by 2.

5 goes into this machine.  Which number will come out?

3 goes into this machine.  Which number will come out?

4 goes into this machine.  Which number will come out?

10 goes into this machine.  Which number will come out?

20 goes into this machine.  Which number will come out?

20 comes out of this machine.  Which number went in?

2 comes out of this machine.  Which number went in?

22 comes out of this machine.  Which number went in?

16 comes out of this machine.  Which number went in?

50 comes out of this machine.  Which number went in?

• Question 1

5 goes into this machine.  Which number will come out?

10
EDDIE SAYS
5 × 2 = 10
• Question 2

3 goes into this machine.  Which number will come out?

6
EDDIE SAYS
3 × 2 = 6
• Question 3

4 goes into this machine.  Which number will come out?

8
EDDIE SAYS
4 × 2 = 8
• Question 4

10 goes into this machine.  Which number will come out?

20
EDDIE SAYS
10 × 2 = 20
• Question 5

20 goes into this machine.  Which number will come out?

40
EDDIE SAYS
20 × 2 = 40
• Question 6

20 comes out of this machine.  Which number went in?

10
EDDIE SAYS
20 ÷ 2 = 10
• Question 7

2 comes out of this machine.  Which number went in?

1
EDDIE SAYS
2 ÷ 2 = 1
• Question 8

22 comes out of this machine.  Which number went in?

11
EDDIE SAYS
22 ÷ 2 = 11
• Question 9

16 comes out of this machine.  Which number went in?

8
EDDIE SAYS
16 ÷ 2 = 8
• Question 10

50 comes out of this machine.  Which number went in?

25
EDDIE SAYS
50 ÷ 2 = 25
---- OR ----

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