Primary school sixth grade math problems, to be able to understand, it is best to have an arithmetic

Volume of a conical plumb:

Plumb height: 314 1 3 (.)

A: The plumb height is 12cm.

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Cylinder volume =h* *r*r

The formula for the volume of the conic is v=1 3*h* *r*r

List the equation *10*10*1=1 3* *5*5*h, which means that the volume of the coneal is equal to the volume of the cylinder of the upper body.

H=12 cm is obtained

Subtract the volume of the original water column from the volume of the rising water column to get the volume of the plumb, and then calculate the height of the plumb according to the radius of the plumb: 1*10*10* divided by (5*5* (where is pi).

1.Did you copy the wrong number? No integer answers.

2.(3360-2730) The speed of the aircraft.

2730 420 = hours.

3.(Kettle + weight of five cups of water - (weight of one cup of water + kettle)] 4 = weight of one cup of water.

1.According to the idea, the father is 26 years older than the daughter, and if the daughter is x years old, the father's age is 3 times, then the father is (x+26) years old, the equation is x+26=3x, and the solution is x=13, that is, 10 (23-12=10) years ago is 3 times.

Kilometers, calculated is the distance of the next day less than the first day, 630 divided by 420 kilometers, is the speed of the next day, divided by the distance by the speed to get the time, that is, the hour.

3.According to the title, 1 cup of water + kettle = kg; 5 cups of water + kettle = kg. - De: 4 cups of water = kilograms, so each glass of water weighs kilograms.

Should be. 4/5 divided by 1/4 and subtracted 1/4

Xiaohong has 60 stamps, Xiao Ming has 40 stamps, how many Xiao Ming gives Xiaohong, and the ratio of the number of stamps between the two is 1:4

One, 3 hours.

II, 8, III, 9, 27

Iv, V, Six, 4 9, 4 27

Two shepherd boys were tending their sheep, and A said to B, "Give me one of your sheep, and my sheep are exactly twice as many as your sheep." B said to A, "It would be better to give me one of your sheep, so that I will be equal to the number of your sheep." ”

Excuse me, A has ( ) sheep and B has ( ) sheep.

Analysis: We can start with what B said, he said that it is better to give me 1 of your sheep, which means that A has 2 more sheep than B. For example, if A has 5, then B plus the one given by A is equal to the number of A at this time, so at this time A has 4, then B has 4-1=3, and the difference from the original A is 5-3=2 (only).

Now start with what A said, and give me one of your sheep.

My sheep are exactly 2 times as large as yours. In this case, continuing with the above assumption, B gives 1 to A, B has 3-1 = 2 at this time, and A has 5 + 1 = 6, that is, when B gives A 1, there is a difference of 2 between the other door. Then you can do it by the number of servings!

Steps: 1+1=2pcs.

1+1=2.

2+2=4.

2-1 = 1 serving.

4 1 = 4.

4 2 = 8 - the number of A now.

4 1 = 4 - B's current number.

8-1 = 7 - the original one.

4 + 1 = 5 - B original.

A: ......

Elementary School Math Problem Set.

Primary School Mathematics Problem Set (Grade 6 Mathematics Ability Improvement).