Fifth grade mathematics
Fill in the blanks.
1. Find the product of 3.6×0. 1, and you can move the decimal point to (); Find the quotient of 3.6÷0. 1 and you can move the decimal point of 3.6 to ().
2. The school bought some desks and chairs, each table is A yuan and each chair is B yuan. The formula shows that the price of a set of tables and chairs is () yuan; It costs () yuan to buy 7 tables and 8 chairs.
3. When x = 4, x2 = () and 2x = ().
When x = (), x2 and 2 x are equal.
4. A triangular piece of land, its bottom is 15m, and its height at the bottom is 12m. The area of this land is () square meters.
5. Find out the rules first, and then fill in the blanks according to the rules.
25.6 5. 12 1.024 ( )
6. The area of triangle is 0.9 square meters smaller than that of parallelogram with equal base and equal height. The area of this parallelogram is () square meters.
A
Keep one decimal place
Keep two decimal places
Keep three decimal places
3.76×0. 18
4 1÷35
Second, calculation.
1. Calculate the following problem in a simple way.
( 1)0.78× 102 (2)2.5×4.4
2. Calculate or solve equations.
( 1)32.8×2. 1÷0.6 (2)200- 14.85÷0. 1 1+ 19.5
(3)x-0.4x= 18 (4)4×9+2x=37
Third, the judge. Put √ in brackets for the right and × for the wrong.
1. The product of a number multiplied by 1.0 1 must be less than this number. ( )
2.6.0 10 1 ... is a cyclic decimal. ( )
3. The equation must be an equation. ( )
Each trapezoid can be divided into two identical triangles by a line segment. ( )
5. The base of parallelogram is enlarged by 2 times, and the area is enlarged by 2 times under the condition of constant height. ( )
Fourth, solve the problem.
1. A highway with a length of 130 km was built in 5 days, with an average of 12 km per day. The rest will be completed in 7 days. How many kilometers do you need to repair every day on average? (Equation solving)
2. The following is the shot put record of seven students:
(full name)
cockroach
Small bright
Xiao Ming
Xiao Gang
Xiaole
light rain
Xiaowen
Achievement/meter
6.8
7.9
4.3
10. 1
5.6
3.9
6.2
(1) Find the average and median of this set of data respectively.
(2) If another student's score is 5.8 meters, what is the average and median of this set of data?