There are 48 basketballs, half of which are volleyball and 96 volleyball in the gymnasium. Computing ability is the basis of solving math problems in primary schools. In an exam, each question has a corresponding time allocation. If the child's computing ability is poor, he will linger on a certain question, and it is difficult to calculate the correct answer accurately and timely in a limited time, which will inevitably affect other problems, leading to endless problems and low correct rate when he finishes it in a hurry.

Common methods of mathematical calculation

1, split method. As the name implies, the splitting method is to split a number into several numbers for the convenience of calculation. This requires mastering some "good friends", such as 2 and 5, 4 and 5, 2 and 2.5, 4 and 2.5, 8 and 1.25. Be careful not to change the size of the number when splitting.

2. Additive associative law, pay attention to the application of additive associative law (A+B)+C = A+(B+C), and get simpler operation by changing the position of addend. For example: 5.76+13.67+4.24+6.33 = (5.76+4.24)+(13.67+6.33).

In this way, we should master division and multiplication and division flexibly. When you see that 99, 10 1 9.8 is close to an integer, you should first consider division.

3. Split the project method. Fractional splitting refers to splitting the items in the fractional formula so that the split items can be offset before and after. This split item calculation is called split item method. The common splitting method is to split a number into the sum or difference of two or more digital units.