895²=(900-5)²=900²-2*5*900+25=810000-9000+25=801025109²=(110-1)²=110²-2*1*110+1=12100-220+1=1188114.5²= (14+0.5)²=14²+2*0.5*14+0.5²=196+14+0.25=210.25