First, addition calculation
Check calculation method: In addition to calculation, we can also use trace operation to check calculation. Specifically, we can subtract one of the addends from the calculation results, and whether the stone is equal to the other addend.
For example, if we calculate 17+25 = 42, we can check: 42-? 17 = 25。 If the equation holds, the addition calculation is correct.
Second, the subtraction calculation
Checking calculation method: In subtraction operation, we can use the method of inverse operation to check the calculation. Specifically, we can add the minuend to the result of subtraction to see if it is equal to the minuend.
For example, if we calculate 56-28=28, we can look it up: 28+28=56. If the equation holds, then the subtraction calculation is correct.
Third, the multiplication operation
Checking calculation method: We can use division to check the calculation when performing multiplication. Specifically, we can divide the result of multiplication by one factor to see if it is equal to another factor.
Like 7? × 8= 56, we can check: 56? ÷ 7=8。 If the equation holds, then the multiplication calculation is correct.
Fourth, division calculation
Checking method: In division calculation, we can use multiplication to check. Specifically, you can multiply the result of division by the divisor to see if it is equal to the dividend.
For example, to calculate 64 ÷ 8=8, we can check: 8? × 8 =64。 If the equation holds, then the division calculation is correct.
Math learning methods in grade three:
1. Give lectures and do the questions carefully.
This is the main reason for getting good grades. Listen attentively, follow the teacher's thinking, don't be distracted, and don't listen at the same time. Hand-to-hand, mouth-to-mouth, eye-to-eye, ear-to-ear and heart-to-heart.
Homework after class is also an important part of learning and consolidating mathematics. Accuracy means accuracy, concentrate on completing your homework independently, strive to be accurate once, and correct any mistakes in time. And speed is to exercise your concentration and sense of urgency.
Step 2 review and preview
For the review of mathematics, I intend to preview it every night. After finishing my homework that day, I will briefly look at the new knowledge I will learn the next day, and then recall what the teacher said.