Rows
Columns
Repeated Addition
Addition
Subtraction
100

3 rows of 5 

15

100

4 columns of 3

12

100

3 + 3 + 3

9

100

28 + 34

62

100

183 - 128

55

200

2 rows of 4

8

200

2 columns of 10

20

200

4 + 4 + 4 + 4

16

200

79 + 21

100

200

73 - 48

25

300
5 rows of 5

25

300

3 columns of 7

21

300

5 + 5

10

300

188 + 123

311

300

162 - 45

117

400

1 row of 7

7

400

6 columns of 3

18

400

1 + 1 + 1 + 1 + 1 + 1 + 1

7

400

247 + 125

372

400

800 - 230

570

500

4 rows of 6

24

500

8 columns of 1

8

500

9 + 9 + 9

27

500

365 + 227

592

500

600 - 124

476