Show:
Addition&Subtraction to 10
Addition to 20
Subtraction to 20
Addition with Regrouping
Subtraction with Decomposing
100

2+4=

6

100

6+6=

12

100

15-10=

5

100

23+8=

31

100

24-5=

19

200

5+5=

10

200

10+4=

14

200

14-7=

7

200

56+17=

73

200

67-18=

49

300

7-3=

4

300

7+8=

15

300

20-2=

18

300

142+38=

180

300

192-46

146

400

3+6=

9
400

9+7=

16

400

17-9=

8

400

253+59=

312

400

234-78=

156

500

9-5=

4

500

12+5=

17

500

18-7=

11

500

459+285=

744

500

351-174=

177