三年级数学下册五《面积》面积单位同步练习(二)北师大版.doc

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1面积单位 一、填空在横线上填上适当的单位名称铅笔盒宽 10_一块手帕的面积 100_数学课本长 19_课桌高 7_一个钮扣的面积大约是 1_二、判断题1. 用两根同样长的铁丝围成两个不同形状的长方形,它们的面积相等. ( )2. 一个长方形长增加 5 厘米,宽减少 5 厘米,它的周长不变. ( )3. 用两个大小相同的正方形,拼成一个长方形,长方形的面积与两个正方形的面积之和相等. ( )4. 边长是 1 厘米的两个正方形,拼成一个长方形,长方形的周长是 8 厘米. ( )三、应用题1. 学校操场宽 20 米,长比宽的 2 倍还多 8 米. 它的面积是多少?2. 一个长方形和一个正方形的周长相等,已知正方形的周长是 40 分米,如果长方形的长是 12 分米,这个长方形的面积是多少平方分米?2答案一、厘米平方厘米厘米分米平方厘米二、错 对 对 错三、1. 960 平方米2. 96 平方分米

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