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How to check the addition and subtraction method
Addition is checked by subtraction, otherwise subtraction is checked by addition
For example, the original title: 3 + 2 =?
We calculate 3 + 2 = 5. To check the calculation, we do 5-2 =?. if the result is equal to 3, then the original topic is right
For another example, if 3 + 2 is equal to 4, and then check, do 4-2 =? Calculate the answer = 2, not 3 in the original question, then I made a mistake
What are the similarities and differences between the addition and subtraction of decimals and that of integers
The decimal addition and subtraction digits should be aligned, and the 0 at the end of the decimal should be removed (except rounding); the integer addition and subtraction digits should be aligned, up to decimal one
40 decimal addition, 40 decimal subtraction
What do decimal addition and integer addition and subtraction have in common
nothing
As long as the corresponding bit alignment is done, the decimal point corresponding to the result has no effect on the operation process, and the integer is the same
Is the ratio a fraction or a decimal or an integer?
Good marks
The result of reduction ratio is a quotient, which can be decimal, fractional or integer
The result of the reduction ratio is a quotient, which can be a decimal, a fraction or an integer
Simplification means simplification
After simplification, ratio is still a ratio, not a number
If you don't understand, please ask
How to calculate the ratio of fractions to decimals? How to calculate the ratio of integers to decimals? How to calculate the ratio of fractions to decimals
How to calculate the ratio of fractions to decimals
How to find the ratio of integer to decimal
How to calculate the ratio of fractions to decimals
A fraction is more than a decimal
The ratio of an integer to a decimal turns the decimal into an integer
How to simplify the ratio of integers, fractions and decimals
yes
The same
Just divide the preceding item by the following
Get a minimalist score
And then the score is
Numerator denominator
First simplify the ratio, then calculate the ratio
4:8, 1 / 6: 2 / 3, 7 / 12: 0.35:0.65
8: 8 / 9, 3 / 8: 5 / 12
0.4：8 =1:2=1/2
1 / 6: 2 / 3 = 1:4 = 1 / 4
7 of 12:21 of 20 = 5:9 = 5 / 9
0.35：0.65=7:13=7/13
8: 8 / 9 = 9:1 = 9
3:8: 5:12 = 9:10 = 9 / 10
First simplify the ratio, then calculate the ratio
0.72：0.36
eight-ninths
0.72：0.36=72:36=2:1 =2
4 out of 5: 8 out of 9
=9:10
=9 out of 10
RELATED INFORMATIONS
- 1. Subtraction is the inverse of addition, and division is the inverse of multiplication______ ．
- 2. In the division operation with remainder, the divisor is equal to the product of divisor and quotient, plus (). What number should be filled in the brackets below to make the divisor maximum （）÷9=8…… （）
- 3. When Xiao Zhang calculates the division with remainder, he takes the divisor 113 as 131, and the result quotient is 3 more than the original, but the remainder is exactly the same, so the remainder of the problem is () A. 、4B. 5C. 6D. 7
- 4. When Xiao Ming calculates the division with remainder, he wrongly writes the divisor 115 as 151, and the result quotient is 3 larger than the correct result, but the remainder is exactly the same______ ．
- 5. In division with remainder, the divisor is equal to several times several plus several
- 6. In the division formula without remainder, the divisor divisor × quotient = () A. Divisor B. 0C. Quotient D. dividend
- 7. Xiao Ming is calculating the division with remainder. He mistakenly writes 308 as 368, and the quotient increases by 5, but the remainder is exactly the same. So he can find the divisor and remainder of the formula
- 8. When calculating the division with remainder, 308 is wrongly written as 368, and the quotient is increased by 5 and the remainder is just right
- 9. When Wang Ming calculates the division with remainder, he takes the divisor 125 as 152. The quotient of the result is three times larger than the correct result, but the remainder is exactly the same
- 10. When doing division without remainder, we know that the divisor + divisor x quotient = 60, what is the divisor?
- 11. Xiaoming saved 2000 yuan and 1000 yuan in two forms respectively, and took them out one year later. After deducting the interest income tax (interest × 20%), he could get 43.92 yuan of interest. It is known that the sum of the annual interest rates of these two kinds of savings is 3.24%, so the annual interest rates of these two kinds of savings are respectively 3.24%______ ．
- 12. Comprehensive problems of mathematical algebra a. B is the two real roots of the quadratic equation MX ^ 2 - (Mn + m + 1) x + 4N = 0 with respect to X. C and D are the two real roots of the equation 8y ^ 2 - (2m + 4) y + (5-N) = 0 with respect to y. if a and C are reciprocal to each other, B and D are reciprocal to each other, the values of M and N are obtained
- 13. A comprehensive problem of geometry plus algebra in the third year of junior high school Given that the four sides of a convex quadrilateral ABCD are a, B, C, D in order, and AA + AB AC BC = 0, BB + BC BD CD = 0, then the quadrilateral ABCD is () A. Parallelogram B. rectangle C. diamond D. trapezoid
- 14. 1. If the square of (5-3a / 4) x + 5x-3 = 0 is a one variable linear equation about X, then a= 2. Fill a conical vessel with a bottom diameter of 30 cm and a height of 8 cm with water, and then pour the water into a cylindrical vessel with a bottom diameter of 20 cm and a height of 5 cm. Will the water overflow? Why? Please use the equation to solve the problem, which can only be solved once a dollar.)
- 15. The problem of removing bracket and denominator It takes 11 hours for a ship to arrive at a place after 9 hours downstream from a place, and it takes 11 hours to return to a place according to the original route?
- 16. Choose words and fill in the blanks A pay attention B protect C obey D protect e keep () public order, () public security, () public property, () environment are the basic requirements of social morality
- 17. Choose words and fill in the blanks (only fill in the serial number of words) (A) The legend of (b) and the story of (c) 1. Fill in () in bracket a 2. Fill in () in bracket B 3. Fill in () in bracket C A. Jingwei reclamation B. grinding Xu Cheng Zhen C. Dayu water control D. digging canal E. Li Bing controls water F. dripping wears away stone g. Kua Fu pursues the day h. Yi shoots at the nine days The legends of () and () and the stories of () express the indomitable struggle spirit of Chinese people in ancient times
- 18. Fill in the number of the correct answer in brackets &The movement of elevator ③ Take photos &(4) projection slide ⑤ Paper cut Butterfly A. Translation B, rotation C, symmetry D, magnification
- 19. Choose (put the serial number of the correct answer in brackets) A bag of rice has 64 kg, if you eat 3 kg a day, enough to eat () days A.20 B.21 C.22
- 20. (put the serial number in brackets) 1. The length, width and height of a cuboid are 5 decimeters, 4 decimeters and 6 decimeters respectively, and the sum of its edges is () A. 60 decimeters b.60 square decimeters c.120 cubic decimeters d.30 decimeters 2. A cuboid steel is 3 meters long and its cross-sectional area is 240 square decimeters. The volume of this steel is () A. 7.2 cubic meters b.7200 cubic meters c.7200 square meters d.72 cubic centimeters 3. Cut a cuboid which is 6 cm long, 5.2 cm wide and 4 cm high into the largest cuboid whose volume is () A. 64 cubic decimeter b.64 cubic centimeter c.216 cubic decimeter d.216 cubic centimeter 4. Place several cubic decimeter cubes into the smallest cube (excluding the case of only one cube). The volume of the cube is () A. 4 cubic decimeters B.6 cubic decimeters c.8 cubic decimeters d.16 cubic decimeters 5. A cuboid wooden box with a volume of (40 × 30 × 30) cubic centimeter can hold at most () cubes with an edge length of 1 decimeter A.30 B.36 C.40 D.36000