Adding!
Subtracting!
Mystery!
Place Values!
100

14 + 2

16

100

9 - 2

7

100
9 + 2

11

100

What number is in the 10's place: 23

2!

200

20 + 20

40

200

10 - 4 

6

200

12 - 6

6

200

What number is in the 1's place: 45

5!
300

13 + 20

33

300

12 - 9

3

300

45 + 13

58

300

What number is in the 10's place: 17

7!

400

22 + 45

67

400

20 - 5

15

400

20 - 7

13

400

What number is in the 10's place: 3

Trick question! There is no number in the 10's place.

500

36 + 12

48

500

17 - 4

13

500

67 + 22

89

500

What number is in the 1's place: 6

6!