# Know Your Numbers: How to Halve

In this worksheet, students halve numbers to work out what goes in to and what comes out of the Halving Machine.

Key stage:  KS 1

Curriculum topic:   Number: Multiplication and Division

Curriculum subtopic:   Solve Multiplication/Division Problems

Difficulty level:

### QUESTION 1 of 10

This machine halves numbers. That means, it divides them by 2.

Here 12 ÷ 2 = 6. So when 12 goes in, 6 comes out.

Also 6 x 2 = 12. So when 6 comes out, 12 must have gone in.

10 goes into the machine. What number comes out?

6 goes into the machine. What number comes out?

8 goes into the machine. What number comes out?

20 goes into the machine. What number comes out?

40 goes into the machine. What number comes out?

10 comes out of the machine. What went in?

1 comes out of the machine. What went in?

11 comes out of the machine. What went in?

8 comes out of the machine. What went in?

25 comes out of the machine. What went in?

• Question 1

10 goes into the machine. What number comes out?

5
EDDIE SAYS
10 ÷ 2 = 5
5 is half of 10.
• Question 2

6 goes into the machine. What number comes out?

3
EDDIE SAYS
6 ÷ 2 = 3
3 is half of 6.
• Question 3

8 goes into the machine. What number comes out?

4
EDDIE SAYS
8 ÷ 2 = 4
4 is half of 8.
• Question 4

20 goes into the machine. What number comes out?

10
EDDIE SAYS
20 ÷ 2 = 10
10 is half of 20.
• Question 5

40 goes into the machine. What number comes out?

20
EDDIE SAYS
40 ÷ 2 = 20
20 is half of 40.
• Question 6

10 comes out of the machine. What went in?

20
EDDIE SAYS
20 ÷ 2 = 10
10 is half of 20.
So if 10 comes out, 20 went in.
• Question 7

1 comes out of the machine. What went in?

2
EDDIE SAYS
Half of 2 is 1.
So if 1 comes out, 2 went in.
• Question 8

11 comes out of the machine. What went in?

22
EDDIE SAYS
22 ÷ 2 = 11
11 is half of 22.
So if 11 comes out, 22 went in.
• Question 9

8 comes out of the machine. What went in?

16
EDDIE SAYS
16 ÷ 2 = 8
8 is half of 16.
So if 8 comes out, 16 went in.
• Question 10

25 comes out of the machine. What went in?

50
EDDIE SAYS
50 ÷ 2 = 25
25 is half of 50.
So if 25 comes out, 50 went in.
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