All 50 problems should be done in 90 seconds


18-9= 7-4= 17-8= 12-9= 10-2=
16-9= 5-3= 13-8= 11-2= 4-4=
9-3= 6-5= 14-6= 3-2= 10-5=
4-2= 15-6= 6-2= 12-5= 5-1=
13-7= 9-0= 4-3= 14-9= 9-5=
3-3= 11-7= 8-0= 12-4= 10-9=
11-6= 8-4= 7-6= 8-3= 9-2=
8-6= 11-8= 14-7= 16-8= 12-6=
10-4= 6-3= 13-4= 9-8= 8-1=
10-3= 7-2= 15-8= 7-0= 6-6=
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