“面积和面积单位”是九年义务教育六年制小学数学第六册第五单元的内容。本课是在学生掌握了长方形、正方形的特征以及它们的周长计算的基础上进行教学的，是后面学习长方形和正方形面积计算的基础，也是五六年级学习其他平面图形面积计算的基础。 从直线到平面、从长度到面积 The “Area and Area Unit” is the fifth unit of the sixth volume of six-year compulsory primary school mathematics. This course is based on the students mastered the characteristics of rectangular, square and their perimeter calculation basis, is to learn the basis of the calculation of the area of ​​the rectangle and the square, but also the fifth and sixth graders to learn the basis of the calculation of the area of ​​other graphic area. From straight to plane, from length to area