Addition
Subtraction
Doubles
Shapes
10

6+4=

10

10

2-1

1

10

1+1=

2

10

This shape has 3 sides and 3 vertices.

Triangle

20

1+5=

6

20

10-6=

4

20

3+3=

6

20

This shape is round and has no sides.

Circle
30

4+3

7

30

15-5=

10

30

6+6=

12

30

This shape has 4 square corners. It is a special rectangle.

Square