For full tracking and unlimited access to thousands of activities

This activity is about finding missing numbers on a 100 square.

 

Here is a partly-completed 100 square.

 

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
 
33
 
 
 
 
 
 
40
41
 
43
 
 
 
 
 
 
50
51
52
A
 
 
 
 
 
 
60
 
 
 
 
 
 
 
 
 
B
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
C
 
 
 
99
100

 

Look carefully for patterns in the numbers.

 

Find A.

Count across to it in ones. 

Count down to it in tens.

Can you see that A must be 53?

 

Find B.

Count down to it in ones.

Can you see that B must be 70?

 

Find C.

Count across to it in ones.

Count down to it in tens.

Can you see that C must be 95?

 

 

Example

Put the numbers in the correct boxes:

8,  95,  4,  20,  53

 

1
 
 
A
 
 
 
B
 
 
 
 
 
 
 
 
 
 
 
C
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
D
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
E
 
 
 
 
100

 

A and B are single-digit numbers.

C is in the tens column.

D is in the 50s row and in the column that ends in 3.

E is in the 90s row and in the column that ends in 5.

 

This helps us to get the correct match:

 

A = 4
B = 8
C = 20
D = 53
E = 95

 

Let's have a go at some questions now.

 

girl writing

10 questions