Show:
1 more than
1 less than
Addition
Addition
What's Next
100

9

10

100

3

2

100

2 + 3 

5

100

9 + 1

10

100

12

13

200

12

13

200

5

4

200

3 + 2 

5

200

8 + 2

10

200

35

36

300

23

24

300

9

8

300

4 + 1

5

300

7 + 3

10

300

7, 8, 9, 10, ____

11

400

26

27

400

25

24

400

1 + 4

5

400

2 + 8

10

400

20, 21, 22, 23, _____

24

500

49

50

500

1

0

500

5 + 0 + 0 + 0 

5

500

10 + 1

11

500

20, 19, 18, 17_____

16