Primary school students gradually learn to calculate from grade one, but they must master elementary arithmetic.

Reasonable, correct and fast calculation is not easy. Although people have experienced

After a lot of operation practice, some recognized calculation orders are summarized, but for the newly connected

It is still difficult for primary school students to get in touch with the four operations, so it is necessary to teach them.

Do the right guidance.

Basic arithmetic rules of elementary arithmetic.

Elementary arithmetic is very important in the syllabus. Learn this part well.

Capacity is very important. It is the basis for solving basic problems in life, and it exists objectively.

The order of calculation. Any mathematical problem has certain regularity, which has been summarized by predecessors.

Conclusion, the operation rules of four operations are obtained: ① Only when adding or subtracting or.

Only when multiplying and dividing, it is calculated from left to right in turn; (2) There are both addition and subtraction, and

When multiplying and dividing, multiply first and then divide, and then add and subtract; ③ If there are brackets in the formula, count the brackets first.

Then calculate in normal order.

The four examples of operation in the textbook are not very difficult, as long as you follow the operation rules step by step.

There will be no mistakes in the calculation, but even so, there are still many students doing it.

The topic is not serious, or there is really something difficult to understand, so there will be many intentions.

The accident left a deep impression on people.

Second, the easy problems in elementary arithmetic

1.

The operation sequence is wrong.

such as

273-34+24=273-58=2 15

The correct algorithm is 273-34=239 and then +24, and the result is 263.

500÷20×5=500÷ 100=5

The correct result should be 125.

80-20×3=60×3= 180

The correct result should be 80-60=20.

Wait a minute.

These mistakes are caused by students' failure to master the operation.