Qingdao Edition Mathematics Grade Four Volume I * * * Several Units

There are eight units in the second volume of the fourth grade math textbook. The five units are "Number and Algebra", including calculator, the operation law of numbers expressed by letters, the meaning and nature of decimals, and the addition and subtraction of decimals. The field of "space and graphics" includes: understanding polygons and observing objects; The Statistics and Probability field contains an average unit; Graphic dense shop and consumption knowledge are the teaching contents in the field of "practice and comprehensive application", and there is also a wisdom square. Finally, the general comment.

Mathematics is a science that studies the spatial form and quantitative relationship of the real world, including arithmetic, algebra, geometry, trigonometry, calculus and so on. , that is, the tricks of numbers, ancient knowledge about astronomy, calendars and divination.