Can you double and half numbers

1
Can you double and half numbers?

• Work through each page in turn trying to answer
  the doubling and halving questions.
• Tell your partner the answer and then press space
  bar to reveal it.
• Click space bar to move to each new page.
• There are a few clues to help you get started but
  beware - these will disappear after the first few
  questions.
• To leave the game at any time, wiggle the mouse
  to make a small arrow appear in the bottom left
  corner. Click it and then select end show.

Created by Teresa Devonshire Silsoe Lower School
2
What is double 32?

• double the tens,
• double the units,
• put it back together,

64
3
What is half of 82?

• halve the tens,
• halve the units,
• put it back together,

41
4
What is double 26?

• double the tens,
• double the units,
• put it back together,

52
5
What is half of 56?

• halve the tens,
• halve the units,
• put it back together,

28
6
What is double 38?

• You can do these by yourself now.

76
7
What is half of 106?
53
8
What is double 46?
92
9
What is half of 92?
46
10
What is double 29?

• Nearly there.

58
11
What is half of 72?

• This is your last one.

36
12

• CONGRATULATIONS !

You are a star !
Click the star to play again.
Click the circle to try some harder questions.
13

• Click the space bar once for each new question to
  appear. Youll then have four seconds to say or
  write down the answer before it appears.
• Click the space bar again to move on a page.
• Can you beat the computer?

32
50
half 64
double 25
47
82
half 94
double 41
14
52
half 28
double 26
12
34
half 24
double 17
43
74
half 86
double 37
14

• How about these larger numbers?
• (Remember to double or half each part and then
  combine your answers.)
• Can you still do them in four seconds?

54
146
half 108
double 73
60
134
half 120
double 67
73
190
half 146
double 95
65
164
half 130
double 82
84
176
half 168
double 88
15

• Try this final set of even harder mixed
  questions.
• Remember to look at them carefully as they are
  not in the same order.
• How many can you do before the answers appear?

73
87
half 146
half 174
136
91
double 68
half 182
76
154
double 38
double 77
83
91
half 166
half 182
184
178
double 92
double 89
16

• EXCELLENT YOU WORKED HARD ON THESE !

Do you feel confident that you can do them
quickly and efficiently now?
Here is your award for doing so well.