I. Definition and unit of measurement of area
1, and the area is described as the size of the area space owned by the surface of an object or a closed figure.
2. The skills of comparing area size include direct observation, overlapping comparison, measuring with the same standard and drawing a square for comparison. It should be noted that all measurements should follow a single standard.
3. Common area units include: centimeter, decimeter, meter and square centimeter, square decimeter and square meter. Please note that the measurement objects of length unit and area unit are different, so don't confuse or compare them.
Second, the relationship between area calculation and area unit conversion
1, the rectangular area is calculated by multiplying the length by the width.
2. Because a square is a special rectangle, its area formula can be written as side length multiplied by side length.
3. The permeability between three common area units, namely square meter, square decimeter and square centimeter, is 100. That is, 1 m2 is equal to 100 square decimeter, 1 square decimeter is equal to 1 0000 square centimeter, and1m2 is equal to 10000 square centimeter.
Third, solve the problem of area and perimeter in real life.
1. Distinguish the concepts of perimeter and area: perimeter represents the sum of the sides of a closed figure, and area represents the surface area of an object or the capacity of a plane figure.
2. Calculate according to the perimeter or area formula of different shapes.
3. Pay attention to the choice of measurement units. The perimeter should be in length, and the area should be in area. For example, the square area is usually expressed as the square of the side length.
Learning experience of rectangular square area meter:
1, learning objectives
Knowledge and skills: mastering the area calculation formulas of rectangles and squares can solve some simple practical problems.
Process and method: Students experience the process of swinging, thinking and dialogue, and master the discovery process of rectangular and square area calculation formulas.
Emotion, attitude and values: make students realize that mathematics is closely related to real life, and cultivate students' feelings of loving life and mathematics.
Step 2 focus on learning
Master the calculation method of rectangular and square area.
3. Learning disabilities
Understand the derivation process of rectangular area calculation formula.