把长方形纸对折成2份、4份、8份．（1）在图1中把长方形纸的涂上颜色．（2）在图2中把长方形纸的涂上颜色．（3）在图3中把长方形纸的涂上颜色．
= ．
口算 55+37= 80﹣26= 1400﹣800= 2+210= 9+300= 82+0= 1﹣= += ﹣= ．
口算我最棒.+=+=﹣=﹣=+= 1+=﹣0.2=+0.3=+= 1﹣+=﹣﹣=++=
==== 0.32===== 2x+x=
240﹣40÷4= 125×（8+8）= ÷12=6 2000×3+60= 320×11÷32= 1﹣= 24×5﹣25×4= 8×13×25= 4005÷19≈
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涂上颜色．
涂上颜色．
涂上颜色．
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= 24×5﹣25×4= 8×13×25=