8+ =35-20 18- =29-20 -8=36-30
9+ =57-40 12- =60-56 -7=49-43
6+ =24-10 11- =95-90 -5=18-9
8+7=35-20 18-9=29-20 14-8=36-30
9+8=57-40 12-8=60-56 13-7=49-43
6+8=24-10 11-6=95-90 14-5=18-9