Fast mental arithmetic —— (mental arithmetic, oral arithmetic and written arithmetic) is a teaching mode that is really synchronized with primary school mathematics textbooks. Fast heart is the only method for simple calculation without any physical objects, neither abacus nor finger, nor chessboard and chart. The arrangement and difficulty of fast mental arithmetic textbooks are closely linked to the syllabus of primary school mathematics and integrated with junior high school algebra, which is faster than primary school textbooks. It simplifies the written calculation and strengthens the oral calculation. Simple.
I have learned to multiply, divide, add and subtract any digit above grade three. Second grade, multiplication and division of numbers. In the first grade, numbers are added and subtracted. In kindergarten, children in large classes can learn addition and subtraction of numbers, such as 5869+35 16, abdication and subtraction of numbers, such as 8 185-6938. Calculate the elementary school mouth in advance. Learning fast mental arithmetic is helpful for children to go to primary school in the future. Children do their homework without draft paper, and write the answers directly. Quick mental arithmetic is different from abacus mental arithmetic and palm mental arithmetic. Xi 'an teacher Niu Hongwei invented the fast mental arithmetic. (Mr. Niu Hongwei obtained the patent certificate issued by China people and China National Intellectual Property Administration. Patent number; ZL200830 1 174275。 It is protected by the patent law of China people. ), mainly through certain rules in textbooks, train children to perform fast operations of addition, subtraction, multiplication and division. "Quick mental arithmetic" is helpful to improve the order, logic and sensitivity of children's thinking and behavior, and train children's eyes, hands and brain to react and calculate synchronously.