Show:
Normal
Hard
Very Hard
Extremely Hard
NIGHTMARE
100

2×3=

6

100

8×5

40

100

4×12

48

100

140÷20

7

100

(100×100)÷5

2000

200

3×6=

18

200

8×9

72

200

12×12

144

200

1÷0

Undefined

200

(12×60)+13-12

21

300

4×7=

28

300

9×6

54

300

13×2

26

300

50÷30

1

300

is siraj stinky 

I don't know

400

5×12=

60

400

9×12

108

400

13×3

36

400

hi

hi

400

100×2÷34+45-60

-10

500

7×7

49

500

10×10=

100

500

1000-567

433

500

7251÷5

1450.2

500

10000x100+65-40+20

100045