subtraction
Addition
subtraction and addition
subtraction with 10
Addition with 10

100

9-3

6


100

1000+1000

2000

100

12+4

16

100

10-3

7

100

10+10

20

200

54-4


50


200

3000+3000

6000

200

4+4

8

200

10-1

9

200

10+20

30

300

69-38

31

300

4000+4000

8000

300

32-1

31

300

10-2

8

300

10+30

40

400

5-1


4

400

8000+8000

16000

400

40-10

30

400

10-4

6

400

10+40

50

500

100-3


96


500

16000+16000 

33000

500

50-3

47

500

10-5

5

500

10+50

60

M
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