20 simple multiplication and division problems for 6th grade have answers 10

1.A rectangular open space, 500 decimeters long and 40 meters wide, reduced it to the original 1 100 drawn on the drawing, what is the area of the rectangle on the drawing?

The most common mistake: I don't understand the meaning of "shrink by 1 100", and after calculating the area, multiply it by 1 100

Analysis: For example, what would we do if we were to scale our classroom down by 1,100 and draw a floor plan?

Other errors: There was an error in unit conversion, and the unit of area was incorrectly written as "meter".

2.A wire is cut in half and half, and there is still rice left after cutting it twice, how many meters is this wire originally long?

Common mistake: m), like this, only the length after the wire was cut for the first time, and not "restored" to the length before the cut.

Solution: Draw a line diagram to help us understand the idea.

3.Xiaohua used her pocket money to buy books in the bookstore, she bought a copy of "The Story King" and used half of the total money, and bought a copy of "Happy Composition" and used half of the remaining money.

The idea of this question is the same as above.

4.When Wang Hong calculates a decimal division calculation problem, she points the decimal point of the quotient by one wrong place, and the quotient obtained is more than the correct quotient, what should be the correct quotient?

The key to solving the problem: the quotient obtained is 10 times larger than the correct quotient, that is, the quotient obtained is (10 1) times more than the correct quotient.

1.A rectangular open space, 500 decimeters long and 40 meters wide, shrink it to the original 1 100 Draw on the drawing, what is the acre of the rectangular elimination code forest surface on the drawing? Most common mistakes:

If you don't understand the meaning of "shrinking by 1 100", after calculating the area, multiply it by 1 100 and analyze: for example, if you want to reduce our classroom by 1 ...

On Arbor Day, 60 people in a class planted trees, and each person planted an average of 2 trees, so how many trees did the class plant in total? (Multiplication).

It is known that there are 21 candies, which are distributed to 3 classmates, how much do they share per person? (Division Round Reed).

Xiaoli read a storybook, read 120 pages in the first week, read 130 pages in the second week, read the book in two weeks, how many pages is there in this storybook?

A piece of sandy land of 180 hectares has been greened, how many hectares of sandy land still need to be greened?

In a parking lot, there are 15 private cars and the rest are buses, how many cars are parked in this parking lot?

The original price of a mobile ** is 2400 yuan per unit, and now it is lower than the original price. How much does it cost now?

The current price of a mobile ** is 2400 yuan per unit, and now it is lower than the original price. What is the original price of Red Star Poultry Company exported 14 tons of eggs last year, and this year has increased the export of eggs compared with last year, how many tons of eggs are exported this year?

The traffic management department planned to set aside 60 parking spaces on the side of a road, which were zoned on the first day and the second day. How many spaces are left unmarked?

1) There are oranges and apples in the store weighing a total of 260 kilograms, of which the weight of the oranges is that of apples, how many kilograms of oranges and apples weigh in the store?

2) Hope Primary School set up a computer room, a total of 88 computers were purchased in two years, it is known that the number of computers bought this year is last year, how many computers were bought in each of the two years?

A batch of rice was transported into the canteen, and it was used, exactly 1400 kilograms, how many kilograms of rice were in this batch 2The bookstore shipped a children's storybook, which sold 30 percent on the first day and 120 percent on the second day, 30 more copies than on the first day. How many of these storybooks are there in the bookstore?

1.A farm warehouse transported 162 tons of fertilizer and brought in 142 tons, at this time the fertilizer in the warehouse is 5% less than the original, how many tons of fertilizer was in the warehouse?

3.In the first quarter of Shazhou Paper Mill, the monthly newsprint output increased by 10% compared with the previous month, and it has been known that 220 tons of newsprint were produced in February.

4 Hongshui Township built a 2,400-meter-long canal, the first week repaired the full length, the second week repaired the remaining 11 20, how many meters more to complete the task?

5.The master and apprentice process a batch of parts together, and when the task is completed, the master adds 65% of this batch of parts, and the apprentice processes 24 pieces less than the master, how many parts are processed by the master and apprentice?

6 x field industrial output value of 900,000 yuan in January, 20% less than in February, how much is the industrial value in February?

7 Xiao Ming read a book, read 40% of the book on the first day, read one-third of the book on the second day, and read 80 pages on the third day. How many pages are in the book?

8.There are three classes in the sixth grade of a school, the number of students in class A is 1 and 2 5 times that of number B, class B is 20% less than that of class C, there are 56 students in class A, how many people are in the sixth grade?

9.Yuejin Village's total grain output last year was 1.8 million kilograms, and this year it will strive to increase by one and a half percent over last year.

10.The number of male students and 60% of the number of female students in Kuratop Elementary School is exactly equal, and it is known that there are 480 male students in this school. I'm also in 6th grade, I hope you go to the next level, remember to adopt it, hehe.

Find the number of parts first (fractions without units are generally the number of parts in the problem).

After finding the number of servings, look to see if there is the word "of" in front of the number of servings, for example: 1 2 of a bag of rice

If there is no word "of", look for the word "than". (The parenthetical unit "1" is the "number of copies".)

The unit "1" is in parentheses than ( ).

After determining the unit "1", find the specific number of the unit "1", if there is, use multiplication to find the unit "1", if not, use division to find the unit "1".

Try to draw pictures for questions that compare words.

I hope it will help you, I am also a 6th grade elementary school student, this is the method that our teacher taught us is very useful, ordinary questions, difficult problems, Olympiad questions can be used, but only for fraction questions. Thank you. Hope to adopt!

1. Find the unit "1" first.

2. Draw a line segment diagram.

3. Write out the quantitative relation.

4. Answer. The unit "1" is known, using multiplication. The amount with the unit "1" The fraction corresponding to the problem = the amount required.

Unit "1" unknown. Find the unit "1" using an equation or division. Use a known quantity The fraction corresponding to the known quantity = the quantity of the unit "1".

Don't start with the molecule, multiply the denominator by the denominator, first divide the denominator on both sides, and multiply it when it reaches the simplest.

There is a fraction division, and first turn the formula into multiplication.

First look at the order of operation of the question, and reduce the number of points.

Multiplication is the denominator multiplied by the denominator, and the numerator multiplied by the numerator! Then see if the numerator and denominator can be reduced. Division is the reciprocal of multiplying a number by a number, well!

Oral arithmetic 4= 39, 40, 42, 43, 44, 45, 46, 47, 49, 50, Short Arithmetic 99-5 Vocabulary:

1. A car can transport up to tons of goods at a time, and there are 20 tons of goods, how many times can this car be transported? 2. How many sets of children's clothes can be made with cloth rice for each set of children's clothes with 50 meters of cloth? 3. How many minutes does it take for Xiao Ming to get from the first floor to the fourth floor, and how many minutes does it take to get from the first floor to the eighth floor at the same speed?

4. To build a road, the planned investment of 10,000 yuan is multiple of the actual investment, how many yuan is the actual investment? 5. How many hours does it take for a train to travel 258 kilometers at the same speed? 6. A blackboard is meters wide and long is twice the width, how many square meters is the area of this blackboard?

7. A road repair team repairs a road, plans to repair rice every day, can be repaired in 20 days, and it only takes a few days to actually repair the road, how many meters of road is actually repaired every day? 8. 40 skipping ropes and 10 small leather balls are 120 yuan, 30 skipping ropes and 10 small leather balls are 95 yuan, how much is a skipping rope? 9. Build a kilometer-long highway, with an average of kilometers per month in the first 3 months, and the rest should be repaired in 2 months.

How many kilometers per month are repaired on average in these 2 months? 10. Build a kilometer-long highway, with an average of kilometers per month in the first three months, and kilometers per month for the remainder. How many months will it take?

Equation: 1) 48-4x=x18 (2)5x+25 7=250 (3) (4) (5) (6) (7)5x-x+14=20 (8) (9) 4( (10)16x+4x+2x=264