Show:
EASY
MEDIUM
HARD
VARY HARD
VARY VARY HARD
100

5+7= 

12

100

10-12

-2

100

759/786=

0.00127226

100

846.202247x67,631=

57,229,504.2

100

854,796x854,793=

7.30674e11

200

2-100=

-98

200

6x8=

48

200

45x56=

2,520

200

8,251x8,251=

68,079,001

200

854,796,639x85,269=

7.28877e13

300

9x10=

90

300

5/9=

0.55555556

300

852,585,858x 200,687=

1.71103e14

300

8,541x8,524=

72,803,484

300

300,000x30=

9,000,000

400

3/6=

0.5

400

4+10=

40

400

842x93,652=

78,852,984

400

54,354,980x49,878=

2.7111212

400

45,465-3,254=

42,211

500

4+5=

9

500

45x200,000=

405,000,000

500

75,312/89=

846.202247

500

4x10=

40

500

856,932,147x38=

3.25634e10