Show:
addition (10)
subtraction (10)
addition (20)
subtraction (20)
mixed review
100

6+4=

10

100

7-3=

4

100

12+5=

17

100

18-5=

13

100

9-4=

5

200

3+6=

9

200

8-8=

0

200

15+4=

19

200

15-3=

12

200

12+3=

15

300

4+3=

7

300

10-4=

6

300

11+7=

18

300

17-6=

11

300

10-1=

9

400

5+3=

8

400

5-4=

1

400

10+10=

20

400

20-19=

1

400

14+4=

18

500

4+2=

6

500

9-6=

3

500

13+6=

19

500

17-4=

13

500

20+0=

20