1. Multiply one digit by two digits orally. Focus on the calculation of multiplying two digits by one digit. You can train in this way, write the questions on the blackboard or notebook, and do 20 small questions every day. Don't use vertical, only mental arithmetic, write answers, write down the time and correct rate. As shown in the following table, the content of oral calculation can be from easy to difficult. You can arrange to practice more than ten times (2-9) first, that is, the first factor 12- 19 and the second factor 2-9, and you can complete ***64 questions in two to three days. Then practice twenty times (2-9) as before. Let's do the problem for thirty times (2-9) until ninety times (2-9). It's harder to get to the back. Don't overemphasize the time spent in practice, mainly depending on the correct rate. It takes about 20 days.
Calculation practice registration form
date
Practical content
Time spent (minutes and seconds)
Correct number of questions
Wrong number of questions
date month year
Minutes and seconds
date month year
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2. Write the multiplication of two digits multiplied by two digits (or three digits). Ten small questions a day require that the writing be neat and vertical, the numbers be aligned, and the numbers carried must be clearly written. When parents check, if they find that the child is wrong, tell the child that there is something wrong. Don't specify what is wrong, let the child check for himself, and if necessary, let the child recalculate by exchanging factor positions. After discovering the mistake, the child told the parents where he was wrong. Incorrect carry, or definitely incorrect multiplication formula, or untidy writing will affect the correct rate. When you practice, you will also keep a record of your practice. Practice for about ten days.
3. The pen divisor is the division of two digits. Methods Calculate the product of two digits and two digits (or three digits) with the same pen. The time is also about ten days.
4. Off-model calculation (layered calculation). Practice three questions every day. Divide the exercise book into left and right sides. Write recursive equations on the left and vertical equations on the right. Vertical fonts must be neat. When a child makes a mistake, it only means that there is something wrong with a small item. The child should correct it himself and find out where the original vertical position is wrong. This kind of training should be persisted for a long time.
5. Simple algorithm. Simple algorithms in primary schools can be classified, and the key point is to master simple methods. The simple calculation of removing brackets in addition and subtraction and the simple calculation of multiplication and division are easy to make mistakes. I will write an exercise in this field when I have time.