Show:
Addition
Before
Shapes
Friends of Ten
After
100

0+0

0 

100

The number that comes before 10 

9

100

This shape has three sides 

triangle 

100

10 + __ = 10 

0

100

The number that comes after 10?

11

200

3+2 

5
200

The number that comes before 15 

14

200

This shape has four sides that are all the same size. 

square 

200

5 + __ = 10 

6

200

The number that comes after 25?

26

300

1+9

10

300

The number that comes before 20 

19 

300

This shape two long sides and two short sides 

Rectangle 

300

6 + __ = 10 

4

300

The number that comes after 39?  

40 

400

10+10

20

400

The number that comes before 50

49

400

This shape has five sides 

Pentagon 

400

1 + __ = 10 

9

400

The number that comes after 75 

76 

500

100+1 

101

500

The number that comes before 100

99

500

This shape has eight sides 

octagon 
500

2 + __  = 10 

8 

500

The number that comes after 99? 

100