Write the Missing Numbers in the 100 Square

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.