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Easy
Challenging
Difficult
Most difficult
Thinking capacity minds
100

10 - 5 =

5

100

110 - 10 =

100

100

200 - 200 =

0

100

305 - 5 =

300

100

579 - 356 =

223

200

25 - 12 =

13

200

124 - 110 =

14

200

199 - 35 =

164

200

315 - 205 =

110

200

975 - 732 =

243

300

40 - 20 =

20

300

149 - 36 =

113

300

250 - 120 =

130
300

350 - 125 =

225

300

823 - 113 =

710

400

55 - 30 =

25

400

166 - 66 =

100

400

275 - 135 =

140

400

395 - 195 = 

200

400

776 - 326 =

450

500

78 - 63 =

15

500

179 - 77 =

102

500

293 - 102 =

191

500

377 - 103 =

274

500

1,205 - 100 =

1,105