In primary school mathematics, computing ability is a very important part of mathematics, and many problems in mathematics need to be calculated to get answers. The following is the relevant content of the compiled mathematical handwritten newspaper.

Mathematics knowledge points of grade one and five:

1, unit of length, unified unit of length. Know centimeters, use centimeters. Quantity: meter. Quantity: Know the line segment, measure and draw the line segment.

2. Addition and subtraction within100 (2): two-digit plus two-digit carry addition and carry addition: two-digit minus two-digit non-abdication subtraction, abdication subtraction, addition, subtraction, addition and subtraction confusion operation and addition and subtraction estimation.

3. Preliminary understanding of angle: preliminary understanding of angle and right angle.

4. In-table multiplication (1): a preliminary understanding of multiplication; The multiplication formula of 2-6 and the calculation formula of multiplication and division.

5. Looking at objects: Looking at objects from different places is axisymmetric; Mirror symmetry.

6. In-table multiplication (2): the multiplication formula of 7-9; Solve a simple substantive problem (how many times is a number) with the multiplication formula of 7-9.

7. Statistics: bar charts.

8. Mathematical wide angle: simple pendulum column (two digits of two digits); The simplest reasoning (2 conditions); Simple reasoning (3 conditions).

Second, mathematics interest arithmetic-special other numbers have a special other number, which can be described by the word "eight without eight".

"There are eight" means that this number has eight digits; "No eight" refers to the sequence from the number 1 to the number 9, in which there is no number 8. The combined display number of "Yes" and "No" is 12345679.

The beauty of this number can be drawn from the equations on both sides:12345679 &; Times: 9 =111111the original number is very regular. Multiplied by 9, the number obtained is more regular and becomes 9 1.

When I first learned to use abacus or pen as multiplication, both teachers and students liked the following groups:

12345679。 Times; 9= 1 1 1 1 1 1 1 1 1。 12345679。 Time:18 = 2222222.12345679. Times: 27 = 33333333.