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Anonymous users2024-02-07You can ask your child to read the multiplication formula!
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Anonymous users2024-02-06Think for yourself how easy it is to do this
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Anonymous users2024-02-05Miscalculated.
The difference between the two. The rules of multiplication:
1) Digit alignment, from the right, use the number on each of the second factor to multiply the first factor, multiply to which digit you want, and the end of the number will be aligned with which digit of the second factor.
2) Then add up the numbers that you have multiplied several times.
Multiply the number with 0 at the end of the integer: you can first multiply the numbers before 0, and then see how many zeros there are at the end of each factor, and add a few zeros to the end of the multiplied number).
on 2021-08-13 Endorse15
What to do if your child is sloppy and inattentive, teach you a super simple and practical way to improve concentration.
What should I do if my child is sloppy and has trouble concentrating? Many parents use this method, and the child's attention problem is solved! Since then, the family has never been worried about the child.
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Ad. Xiao Sloppy misspelled 40 (6) as 40 6 due to carelessness, please do the math, he got the result and correct?
The results obtained are wrong. Because 40 ( 6) 40 40 6 40 240. And the result of a little sloppiness is 40 additive commutative law:
In the addition operation of two numbers, the positions of the two added numbers are swapped, and the sum is invariant. The letter indicates: a b b addition associative law:
Add three numbers, add the first two numbers first, and then add another number; Or add the last two numbers first, add another addition, and keep the same. The letters indicate: (a b) c a (b c).
3. Multiplication commutation law: In the multiplication operation of multiplying two numbers, the position of the two multipliers is exchanged as a wide fiber, and the product remains unchanged. The letters indicate:
a b b multiplicative associative law: multiply three numbers, multiply the first two numbers first, or multiply the last two numbers first, and the product remains the same. The letters indicate:
a×b)×c＝a×(b×c)。5. Multiplicative distribution law: adding (or subtracting) two numbers and then multiplying another number is equivalent to multiplying this number by two additions (subtraction skill), and then adding (subtracting) the two products, and the number remains unchanged.
Letters indicate: (a b) c a c b c; a×c＋b×c＝(a＋b)×c。②a×(b—c)＝a×b—a×c；a×b—a×c＝a×(b—c)。
6. The law of continuous subtraction: a number subtracts two numbers in a row, which is equal to the subtraction of this number by two numbers.
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Anonymous users2024-02-0423 times 12 = 276
32 times 21 = 672
24 times 20 = 480
23 times 11 = 253
42 times 12 = 504
22 times 13 = 286
Application question: If a garden plants 40 trees in each row, it is enough to plant 700 saplings in 19 rows.
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Take the "six" in the ten place as "nine", and the "three" in the unit position as "five", that is, take 63 as 95, and calculate 97, so 95-(-2) = 97, so 63-(-2) = 65, and finally 65
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