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For example:
multiply the largest two digits by the largest one digit: 99x9 = 891, multiply the smallest two digits by the smallest one digit: 10x0 = 0. A part of the proct between is two digits, such as 22x3 = 66
so the proct of two digits multiplied by one digit in the third grade math problem may be two digits, three digits or one digit
because the maximum two digit number is 99, the maximum one digit number is 9, the proct is 891, and the proct is three digits
the minimum one digit is 1, the minimum two digits is 10, the proct is 10, two digits
so the proct of two digits multiplied by one digit can be three digits or two digits
extended data:
four problems should be paid attention to in vertical multiplication calculation:
1. The last digit of two numbers should be aligned
2. Try to write more numbers on the top and less numbers on the bottom to rece the times of multiplication
3. If there is a "0" at the end of two numbers, you can only align the last digit of the number before "0" when writing the vertical proct, and finally add the number of "0" shared by two numbers after the vertical proct
4. In decimal multiplication, the decimal point of the proct should be determined according to the multiple of the decimal
32 * 38
44 * 46
57 * 53
68 * 62
79 * 71
95 * 95
ten digits are the same, and the sum of indivial digits is equal to 10
and so on: the multiplication of indivial digits and indivial digits makes ten digits, and the multiplication of ten digits and ten digits plus one makes one hundred thousand digits. For example, 44 * 46 = 20
24, 95 * 95 = 90
25
it should be:
31 × 4 = 124
or 41 × 4=164
first, lack of power
watches need different power when they travel. For example, mechanical watches store power by shaking when they are worn daily. If they are not worn for a long time and have no power, the watch will definitely stop or slow down. The manual one needs to be up and down from time to time, and some rely on the electronics to maintain rotation. Therefore, if the watch is out of time recently, it is likely that the electronics are out of power and need to be replaced
Second, external interference
this is whether you pay attention to it when you wear it in daily life. For example, watches are delicate, and it's normal for watches to be out of time if they are not waterproof, antimagnetic and shockproof. If you wear a watch that can't do strenuous exercise to play golf or badminton, the strong shock may cause damage to the parts in the watch, and the watch will not be allowed to leave
in addition, it's a clich é that watches are afraid of magnetism. If your job is to do some research, and you need to often contact with large electronic equipment, try not to wear a watch, because the surrounding magnetic field will disturb the normal walking of the watch. Some people say that the watch is bought to wear, every day baby can't, still buy it for what? It's true, but you should pay attention when wearing it
Third, proper maintenance
watches are more precise, and there are many small parts. Only when the parts fit each other can they work normally, so there is no need for friction. Therefore, all watches need to be oiled, and it will inevitably dry up after a long time. In addition, some impurities may enter the watch, which will lead to inaccurate travel time. At this time, you need to go to maintenance, Clean your watch
the maintenance service center is located at room 05, 24 / F, sac Sichuan aviation Plaza, No. 6, Renmin East Road, Jinjiang District, Cheng, Tel: 028-62780618