1. Expand the dividend and divisor by the same multiple at the same time, convert the divisor into an integer, and then calculate. After the answer is obtained, it should be substituted into the original formula for checking calculation. When writing vertical division, write the vertical division symbol first, and then write the dividend and divisor on the inside and left side of the division symbol respectively.
2. In the division calculation, if the sum of several numbers is divisible by a number, you can divide each addend by this number first, and then add each quotient. Enlarge or reduce the dividend and divisor to the same fraction, and then divide by the fraction with the same sign. For example: (24+32+16) ÷ 4 = 24 ÷ 4+32 ÷ 4+16 ÷ 4 =181.
3, according to the decimal places of the divisor, and then turn the divisor into an integer, how many times the divisor is expanded, and how many times the dividend is expanded, so it becomes a division by integer, and then the column calculation, pay attention to the decimal point of the quotient and the decimal point of the dividend are aligned. Calculate the answer, and finally substitute it into the original formula for checking calculation.
Matters needing attention in calculation
1, carefully examine the topic, see clearly what kind of calculation the topic requires us to do and understand the meaning of the topic. If you have any questions, you should clarify them first. Determine the calculation order, first calculate the power, the root, then the multiplication and division, and finally the addition and subtraction. If there are brackets, count them first.
2. Pay attention to the operation sequence and symbols when calculating, and calculate according to the correct operation sequence. Don't skip any steps and make low-level mistakes. Pay attention to the conversion and conversion of units. For example, if the units are inconsistent, it needs to be converted or converted before calculation.
3. Pay attention to simple calculation when calculating. Simple words should be simple, which can improve the calculation speed and accuracy. Don't copy the wrong numbers and symbols in the topic when calculating, otherwise all previous efforts will be in vain. Use operation symbols such as addition, subtraction, multiplication and division correctly, and don't confuse or misuse symbols.
4. Pay attention to carry in addition and borrow in subtraction. The written rule of addition and subtraction within 10 thousand is: the same digits should be aligned, starting with single digits, where the numbers add up to ten and the previous digit should enter one. Only numbers with the same counting unit can be added or subtracted, that is, the same numbers should be aligned. Add up to ten and you have to move forward one by one.
5. Precautions in multiplication: the 1 bit of one number multiplied by the 1 bit of another number should be added to the first bit of the product. Precautions for division: When calculating division vertically, division should start from most significant bit. If it is not divisible, it is necessary to divide most significant bit and the next person together until the divisor can be divided.