Show:
Numbers to 30
Numbers to 35
Numbers to 25
Addition
Subtraction
100

1+4

5

100
6+2

8

100

5+2

7

100

5+6

11

100

6-5

1

200

5+8

13

200

6+15

21

200

3+7

10

200

15+9

24

200

15-9

6

300

23+3

26

300

9-7

2

300

10-9

1

300

20+12

32

300

20-12

8

400

10-6

4

400

24-9

15

400

20-11

9

400

30+15

45

400

30-15

15

500

30-21

9

500

35-22

13 

500

 25-12

13

500

35+18

53

500

35-18

17