9.4+9.9*99=9.4+(9.4+0.5)*99=9.4*100+0.5*99=940+49.5=989.5
3.2*2.25-3.2=3.2*(2.25-1)=3.2*1.25=3.2x10/8=0.4x10=4
25/6.4 x 8/5=25/5 x 6.4/8=5x0.8=4
2.37*6.3+23.7*0.37=2.37*6.3+2.37*3.7=2.37*(6.3+3.7)=2.37*10=23.7
5.73-2.43+3.27-4.53=(5.73+3.27)-(2.43+4.53)?
3.8*10.1=3.8*10+3.8*0.1=38+0.38=38.38