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100

4 + 3 =

4 + 3 = 7

100

7 - 3 =

7 - 3 = 4

100

__ + 3 = 4

_1_ + 3 = 4

100

10 - __ = 4

10 - _6_ = 4

100

2 + 2 =

2 + 2 = 4

200

2 + 4 =

2 + 4 = 6

200

2 - 1 =

2 - 1 = 1

200

4 + __ = 6

4 + _2_ = 6

200

__ - 4 = 0

_4_ - 4 = 0

200

4 + 4 =

4 + 4 = 8

300

7 + 2 =

7 + 2 = 9

300

3 - 3 =

3 - 3 = 0

300

__ + 5 = 10

_5_ + 5 = 10

300

__ - 2 = 1

_3_ - 2 = 1

300

7 - __ = 4

7 - _3_ = 4

400

2 + 3 =

2 + 3 = 5

400

12 - 7 =

12 - 7 = 5

400

6 + __ = 12

6 + _6_ = 12

400

__ - 10 = 7

__ - 10 = 7

400

6 + __ = 16

6 + _10_ = 16

500

6 + 7 =

6 + 7 =

500

19 - 8 =

19 - 8 = 11

500

11 + __ = 15

11 + _4_ = 15

500

18 - __ = 9

18 - __ = 9

500

10 + 10 + 10 + 10 =

10 + 10 + 10 + 10 = 40