First, the graphic calculation formula.
1, squared: c = perimeter, s = area, a = side length.
Perimeter = side length x4; Side length = area ÷ side length; Area = side length × side length; ; Side length = perimeter ÷4.
2. Rectangle: c = perimeter, s = area, and a = side length.
Perimeter = (length+width) x2; Area = length × width; Length = circumference +2- width; Width = circumference+2-length; Length = area ÷ width; Width = area ÷ length.
Second, the length unit conversion.
1 km = 1 km; 1k m = 1000m； 1 m = 10 decimeter; 1 decimeter =10cm; 1m = 100cm； 1 cm =10mm.
Third, area unit conversion.
1 km2 = 100 hectare; 1 hectare =10000m2; 1 m2 = 100 square decimeter; 1 square decimeter = 100 square centimeter; 1 cm2 = 100 mm2； 1 hectare =10000m2; 1 mu =666.666 square meters.
Fourth, the weight unit conversion.
1 ton = 1000 kg; 1kg = 1000g； 1 kg = 1 kg; 1 kg =2 kg.
Verb (abbreviation of verb) RMB unit conversion.
1 yuan = 10 angle; 1 angle = 10 point; 1 yuan = 100 integral.
Memorizing methods of mathematical formulas in primary schools;
1, strengthening memory in practice.
If you only memorize a large number of primary school math formulas by reciting them, children may be deeply impressed in a short time, but they may gradually forget them after a long time. So you can strengthen your memory through repeated practice, and you can also speed up the speed and correct rate of solving problems in the process of memory, and get better results in homework and exams.
2. Associative memory method.
Elementary school mathematics formula is the basic formula for getting started. In life, this formula will be used in many occasions. To measure the size of building blocks, we must first know the length, width and height of building blocks, and then investigate the cuboid volume formula.
In the process of learning, we can remember, think more and connect with the reality of life through this associative way, so that memorizing formulas will not be so boring.