Subtraction
? x 6
? x 7
? x 8
Addition
100

378-238

140

100

2 x 6

12

100

7 x 3

21

100

2 x 8

16

100

429+15=

444

200

529-213

316

200

5 x 6

30

200

10 x 7

70

200

8 x 5

40
200

572+443

1,015

300

771-531

240

300

6 x 7 

42

300

7 x 7

49

300

4 x 8

32

300

1,340+426=

1,766

400

1,815-703

1,112

400

6 x 10

60

400

7 x 8 

56

400

8 x 9

72

400

6,367+1,720

8,087

500

9,976-234

9,742

500

6 x 12

72

500

11 x 7

77

500

8 x  8

64

500

7,123+2,987

10,110

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