In the third grade, it is time to learn the law of multiplication and exchange. According to the knowledge points, the multiplication law should be used in the checking calculation, that is, the multiplier and the multiplicand are vertically exchanged. You can also use the product divided by the multiplicand/or multiplier to verify (I don't know if you have learned to divide two digits by multiple digits, if not, you can only use the multiplication exchange law to verify.
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How to check the multiplication operation in grade three
Solution:
Multiplication calculation is checked by division, for example:
15x 16=240
Check calculation:
240÷ 16= 15 or: 240÷ 15= 16
So the multiplication calculation is correct.
What are the specific inspection methods for the multiplication of two digits in the third grade of primary school?
What are the specific inspection methods for the multiplication of two digits in the third grade of primary school?
1, and then multiply the two-digit exchange positions.
2. Check by department.
For example:1/kloc-0 /×12 =132.
Check calculation:
1、 12× 1 1= 132
2、 132÷ 1 1= 12
3、 132÷ 12= 1 1
How to check the calculation of mathematical multiplication for children in grade three
1. Integer addition calculation rule: the same digits are aligned, starting from the low order. When the numbers add up to ten, they will advance to the previous number. 2. Integer subtraction calculation rules: align with the same number, starting from the low order. If the number of digits is not reduced enough, subtract it from the last digit, merge it with the standard number, and then subtract it. 3. Calculation rules of integer multiplication: multiply the number on each bit of one factor by the number on each bit of another factor, then multiply the number on which bit of the factor, align the end of the multiplied number with which bit, and then add the multiplied numbers. 4. Calculation rules of integer division: divide from the high order of the dividend, and the divisor is a few digits, depending on the first few digits of the dividend; If the division is not enough, look at another place and the quotient is written on the dividend. If any number is not quotient 1, a "0" placeholder should be added. The remainder of each division should be less than the divisor.
How to check the multiplication of two digits in grade three
Divide the product by a factor = another factor.
There are three factors 4: 1.24.
The factor of 9 is 1 3 9.
Numbers with odd factors are square numbers.
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