Tools/materials: computer, ppt.
1, the expression of fractional division is expressed by numbers. It is easier to understand a fractional division, so write 78÷0.3 instead.
2. Decimal division algorithm To know the algorithm of fractional division, first change the divisor into an integer, and expand 10 times to 780÷3 to calculate.
3. Column This division is expressed in column form, with dividend included and divisor excluded.
4. Align the numbers by dividing 3 by 7 on the hundredth bit and writing the quotient on the hundredth bit.
5. Continue the calculation and then pull down the tenth digit of 8, 18÷3, and write the number in the tenth digit.
6. There is no remainder in the zero of one bit, so you can't forget that there is a zero in one bit, so write the zero on the one bit of the quotient.
The importance of vertical calculation in primary school mathematics;
1, a better understanding of mathematical concepts:
Vertical calculation is a simple and effective calculation method, which can help children better understand mathematical concepts and improve calculation speed and accuracy. Through vertical calculation, children can better master the laws and methods of mathematical operations such as addition, subtraction, multiplication and division, and cultivate their mathematical thinking and calculation ability.
2. Improve children's attention and patience.
In vertical calculation, children need to carefully arrange and calculate numbers, which requires them to concentrate and repeatedly calculate, thus improving their patience and concentration.
3, strong practicability:
Vertical calculation is not out of date, it is a very practical calculation method. In modern society, although calculators and computers can be used for calculation, vertical calculation is still an important calculation method, which can help children better understand mathematical concepts and improve their calculation ability and thinking ability.
Therefore, the vertical calculation of primary school mathematics is an important part of children's mathematics learning, which can cultivate children's mathematical thinking and calculation ability and improve children's attention and patience. Therefore, parents and teachers should pay attention to vertical calculation, so that children can better master this practical calculation method.