x×3.6=y× x-d=y-
0.1-0.01= 6.8÷10%= 3.6÷0.12= 398÷42≈
0.22= × = 24÷ = ×4÷ ×4=
60×20= 0÷36= 7.2+2.87= 908﹣303≈ =