用单位正方形拼铺计算面积

通过用单位正方形铺满一个长方形来求它的面积，并说明这个面积等于长与宽的乘积。

Find the area of a rectangle by tiling it with unit squares and show that the result equals the product of the side lengths

学习证据 / Evidence

• 铺满一个4×6的长方形，数出24个小正方形，然后验证4×6=24。
• 解释为什么行数乘每行的个数就是面积。
• 在方格纸上画一个长方形，用方格铺满，并写出对应的乘法算式。

• Tile a 4×6 rectangle and count 24 squares, then verify 4×6=24
• Explain why the number of rows times the number in each row gives the area
• Draw a rectangle on squared paper, tile it, and write the multiplication

评估问题 / Assessment

如果一间长方形房间长4米、宽3米，{{name}}能不能在脑子里用1平方米的正方形铺满它来算出面积，并解释为什么结果等于4×3？

If a rectangular room is 4 m long and 3 m wide, can {{name}} work out its area by tiling it with 1-metre squares in their head — and explain why that equals 4 × 3?