1) 48*52=(50-2)(50+2)=2500-4=2496
2)43*37=(40+3)(40+3)=1600-9=1591
3)27*33=(30-3)(30+3)=900-9=891
4)84*76=(80+4)(80-4)=6400-16=6386
1) 48*52=(50-2)(50+2)=2500-4=2496
2)43*37=(40+3)(40+3)=1600-9=1591
3)27*33=(30-3)(30+3)=900-9=891
4)84*76=(80+4)(80-4)=6400-16=6386