8+ =35-20 9+ =57-40 6+ =24-10 18- =29-20 12- =60-56 11- =95-90 -8=36-30 -7=49-43 -5=18-9
1)8+_= 35-20 35-30=15 15-8=7 2)9+_=57-40 57-40=17 17-9=8 3)6+_=24-10 24-10=14 14-6=8 4)18-_=29-20 29-20=9 18-9=9 5)12-_=60-56 60-56=4 12-4=8 6)11-_=95-90 95-90=5 11-5=6 7)_-8=36-30 36-30=6 8+6=14 8)_-7=49-43 49-43=6 6+7=13 9)_-5=18-9 18-9=9 9+5=14