Show:
Addition&Subtraction to 10
Addition to 20
Subtraction to 20
Adding 10
Subtracting 10
100

2+4=

6

100

6+6=

12

100

15-10=

5

100

23+10=

33

100

24-10=

14

200

5+5=

10

200

10+4=

14

200

14-7=

7

200

56+10=

66

200

67-10=

57

300

7-3=

4

300

7+8=

15

300

20-2=

18

300

14+10=

24

300

99-10

89

400

3+6=

9
400

9+7=

16

400

17-9=

8

400

253+10=

263

400
100-10=
90
500

9-5=

4

500

12+5=

17

500

18-7=

11

500

459+10=

469

500

135-10=

125