把一张长20cm、宽12cm的长方形纸（如图）裁成同样大小且面积尽可能大的正方形，纸没有剩余，至少可以裁多少个？（先在图上画一画，再写出答案．）
直接写出得数0.25×4= 0.82﹣0.56= 3.09+2.6= 6.03×100=1﹣= ﹣= += +=
口算．3.04﹣0.98= += 2÷9+= ×÷×=12×（+）= 6.3÷0.01= 1﹣58%=
直接写出得数．0.57+0.43= 4.13﹣1.3= 2.5×28=7.2÷0.6= 0.52= 3﹣1=（+）= 15÷×= ×8+8×=
快快算.6.0﹣2.4= 5.3+3.5= 4.7+3.6=20×13= 24×30= 640÷9== = =
口算下列各题．9.9+0.01= 0.08×0.5= 1.25×0.5×0.8== = ﹣+=
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﹣
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+
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= 2÷9+
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×
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）= 6.3÷0.01= 1﹣58%=
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）= 15÷
×
×8+8×
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