20 Mathematical Thinking Training Questions for Fifth Grade! There is an answer .

1.In the following six numbers, the number ( ) is crossed out so that the sum of three numbers is twice the sum of the other two.

2.Let be six given numbers, and take one number at a time from these six numbers, or sum several different numbers (each can only be taken once), you can get a new number, so that you get a total of 63 new numbers. If you put them in order from smallest to largest, it is ,...Then, the 60th number is ( ).

3.A digit in two digits and tens is three times the number in one digit, and if this two-digit number is subtracted by 9, the simple number in the single digit is equal to the number in the ten. This two-digit number is ().

4.Calculate 1001 7 37 444 137 = (

5.Calculate 22+42+62+......402=（

6.There is a three-digit number, the ten digits are the sum of the single digit number and the empty hundred-digit number, and this three-digit number plus 693 then the hundred-digit number and the single-digit number exchange places. This three-digit number is ().

7.The six-digit 865abc is divisible, and to make 865abc as small as possible, a, b, and c are each ( ).

8.The product of the numbers 71427 and 19 divided by 7 is ( ) The divisor of 504 has ( ).

9.A certain unit of the People's Liberation Army conducts platoon training, which happens to form a phalanx, and if each platoon increases 12 people and decreases 4 platoons, it can be arranged into a rectangle. A total of ( ) fighters for cohort training?

10.In the fifth grade mathematics competition, the product of Xiao Ming's ranking and his age and competition score is 2134, and Xiao Ming's ranking ( ) is () points.

1、（6400-1200×3）÷2=14003、（400×12+780）÷9=620

3 15=195 (When they first met, the two traveled 1 full course, of which A traveled 70 kilometers;

When they met for the second time, they traveled 3 whole courses, and A traveled 70 3 = 210 km;

It is known that at the time of the second encounter, A will have 15 kilometers more than 1 full journey -192 (256 8)=2

It's not difficult to read other topics. Now do it yourself? If it's still difficult, let's ask again!

13.A 13kg ; B 10kg

15.After 50 seconds.

10. 740km

12.10 days.

14.198 yuan.

16.180 bags of wheat ; 100 bags of rice.

Kilometers per hour basket meter.

Kilometers per day 13A 30, B 25 yuan seconds.

16.180 kg of wheat and 100 kg of rice.

What about the question? I see, you're on the subject... If you want a fifth-grade math thinking question, if you have an answer, send a copy."

12x13 2=78, A: The shaded area is 78.

Rotate ADB 90 degrees counterclockwise, and DB coincides with DE to get a shadow right-angled triangle.

The conditions given in the diagram or in the question are incomplete and cannot be solved.

Find the area of the shaded part = triangle area - square area, and you can get the desired result.

Doesn't the title say what kind of triangle it is, or give the size of the angle?

1.(x20-18)/

16 more.

2。Harvesting corn:

Wheat + corn = tons.

3.Meeting is half the journey.

The speed is 90 per hour

60km apart

4。Now each set with cloth.

500*set of 4