Are you a number bonds expert

1
Are you a number bonds expert?
Main Menu

• Work through each page trying to decide what you
  need to make 10, 20 or 100.
• Look at the diagrams to help you think about each
  question.
• Try to say your answer before it appears on the
  screen.
• Click the mouse to move to new topics. Use the
  space bar for new questions and new pages in each
  section.
• To leave the game at any time, wiggle the mouse
  until an arrow appears in the bottom left corner.
  Click it and then select end show.

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2
Which questions would you like to work through?

• Pick the circle for questions to 10.
• Pick the triangle for questions to 20.
• Pick the square for easier questions to 100.
• Pick the star for harder questions to 100.

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3
Click the space bar once to see each new
question. Try to say the answer before it
appears.What do you need to make 10?
9 . . . .
1
5 . . . .
5
7 . . . .
3
1 . . . .
9
10 . . . .
0
4 . . . .
6
3 . . . .
7
2 . . . .
8
0 . . . .
10
6 . . . .
4
8 . . . .
2
5 . . . .
5
4
This time you need to do them without the help of
the 10 bar.How many can you get right before
the answers appear?
3 . . . .
7
2 . . . .
8
7 . . . .
3
6 . . . .
4
5 . . . .
5
0 . . . .
10
8 . . . .
2
4 . . . .
6
10 . . .
0
1 . . . .
9
9 . . . .
1
5 . . . .
5
5
You should be really good at these now and be
able to do them really quickly. Try the last set
beware the time limit is just one second this
time!Can you do it?
4 . . . .
6
7 . . . .
3
10 . . .
0
6 . . . .
4
3 . . . .
7
5 . . . .
5
9 . . . .
1
6 . . . .
4
8 . . . .
2
2 . . . .
8
1 . . . .
9
5 . . . .
5
6
BRILLIANT you must be quite a number bonds
expert now!
You deserve a medal for your excellent thinking!
Click the arrow to go back to the main menu and
try a different set.
7
Click the space bar once to see each new
question. Try to say the answer before it
appears.What do you need to make 20?
19 . . .
1
5 . . . .
15
7 . . . .
13
1 . . . .
19
10 . . . .
10
14 . . .
6
13 . . .
7
12 . . .
8
0 . . . .
20
6 . . . .
14
8 . . . .
12
15 . . .
5
8
This time you need to do them without the help of
the 20 bar.How many can you get right before
the answers appear?
13 . . .
7
2 . . . .
18
7 . . . .
13
6 . . . .
14
15 . . . .
5
10 . . .
10
18 . . .
2
4 . . . .
16
0 . . .
20
1 . . . .
19
19 . . .
1
15 . . .
5
9
You should be really good at these now and be
able to do them really quickly. Try the last set
beware the time limit is just one second this
time!Can you do it?
14 . . .
6
17 . . .
3
10 . . .
10
6 . . . .
14
3 . . . .
17
15 . . .
5
19 . . .
1
16 . . .
4
8 . . . .
12
2 . . . .
18
1 . . . .
19
5 . . . .
15
10
BRILLIANT you must be quite a number bonds
expert now!
You deserve a medal for your excellent thinking!
Click the arrow to go back to the main menu and
try a different set.
11
Click the space bar once to see each new
question. Try to say the answer before it
appears.What do you need to make 100?
90 . . .
10
50 . . .
50
70 . . .
30
10 . . .
90
100 . . .
0
40 . . .
60
30 . . .
70
20 . . .
80
0 . . . .
100
60 . . .
40
80 . . .
20
50 . . .
50
10
10
10
10
10
10
10
10
10
10
12
This time you need to do them without the help of
the 100 bar.How many can you get right before
the answers appear?
30 . . .
70
20 . . .
80
70 . . .
30
60 . . .
40
50 . . .
50
0 . . . .
100
80 . . .
20
40 . . .
60
100 . . .
0
10 . . .
90
90 . . .
10
50 . . .
50
13
You should be really good at these now and be
able to do them really quickly. Try the last set
beware the time limit is just one second this
time!Can you do it?
40 . . .
60
70 . . .
30
100 . .
0
60 . . .
40
30 . . .
70
50 . . .
50
90 . . .
10
60 . . .
40
80 . . .
20
20 . . .
80
10 . . .
90
50 . . .
50
14
BRILLIANT you must be quite a number bonds
expert now!
You deserve a medal for your excellent thinking!
Click the arrow to go back to the main menu and
try a different set.
15
What do you need to make 100?Think about how
many more units to reach the next ten and then
how many more to get the rest of the way to 100.
Keep clicking the space bar to see a helpful
number line when you think you have an answer and
again for the next question.
6
30
36
16
What do you need to make 100?(think about how
many more units to reach the next ten and then
how many more to get the rest of the way to 100)
4
40
44
17
What do you need to make 100?(think about how
many more units to reach the next ten and then
how many more to get the rest of the way to 100)
7
70
77
18
What do you need to make 100?(think about how
many more units to reach the next ten and then
how many more to get the rest of the way to 100)
5
60
65
19
What do you need to make 100?(think about how
many more units to reach the next ten and then
how many more to get the rest of the way to 100)
9
20
29
20
Now youve had some practice, try to work them
out mentally by imagining the number line in your
head.The answers will appear after 5
seconds.How many times can you beat the
computer?
33 . . .
67
25 . . .
75
72 . . .
28
66 . . .
34
58 . . .
42
6 . . . .
94
82 . . .
18
43 . . .
57
99 . . .
1
11 . . .
89
95 . . .
5
59 . . .
41
21
What do you need to make 100?This time count on
in tens first and then add on the rest of the
units. Remember to use the space bar to reveal
the number line and the jumps.
1
80
81
22
What do you need to make 100?(this time count
on in tens first and then add on the rest of the
units you should get the same answer)
7
10
17
23
What do you need to make 100?(this time count
on in tens first and then add on the rest of the
units you should get the same answer)
3
80
83
24
What do you need to make 100?(this time count
on in tens first and then add on the rest of the
units you should get the same answer)
6
20
26
25
What do you need to make 100?(this time count
on in tens first and then add on the rest of the
units you should get the same answer)
5
30
35
26
Work out this set mentally by imagining the
second sort of number line jumping.You still
have 5 seconds to think.How many times can you
beat the computer?
43 . . .
57
35 . . .
65
71 . . .
29
16 . . .
84
38 . . .
62
36 . . .
64
86 . . .
14
45 . . .
55
99 . . .
1
17 . . .
83
15 . . .
85
29 . . .
71
27
BRILLIANT you must be quite a number bonds
expert now!
You deserve a medal for your excellent thinking!
Click the arrow to go back to the main menu and
try a different set.