250×14= 250×140=
75×14= 25×28=
△△△△
□□□□□□□□□
﹣ = + = 0.25+ = ﹣ = 4×2.5=
0×98.56= 45×11= 0.85﹣15%= 0.65×101﹣0.65=
×10÷ ×10=