Grade class name

Fill in the blanks. 25 points

1) The counting unit of 0.4 is (); 6.025 includes () 0.00 1.

2) The sum of the largest single digit and the smallest decimal digit is (), the difference is (), and the product is ().

3) When 7 150g = () kg 42min = (),1m5cm = () m.

4) The commercial rounding method of 320 ÷ 33 keeps two decimal places, which is about ().

5) Arrange the following figures in order.

The periods are 1.72,1.72,72, 1.702, 1.727 ().

6) Choose three sticks with the length of 1.5cm, 2cm, 3.5cm and 4cm to form a triangle, and the sides of this triangle may be (), () and ().

7) The two internal angles of the triangle are 92 degrees and 44 degrees respectively, and the third internal angle is () degrees. This triangle is a () angle triangle composed of angles and a () triangle composed of sides.

8) Move the decimal point of a decimal to the right by one place, which is 25.2 more than the original. The original decimal point was ().

9) A three-digit decimal is about 2. 10 after rounding. The smallest decimal is () and the largest decimal is ().

10)□0.□7 Please fill in the numbers in □ to meet the following requirements respectively.

(1) Maximize this number. () (2) Make this number closest to 3 1. ( )

1 1) There are () rectangles * * * in the figure below.

Choose the letter of the correct answer and fill in the brackets. 5 points

1) has () decimals greater than 3.5 and less than 3.7.

A, 0 B, 1 C, 9 D, countless

2) If the lengths of two sides of a triangle are 5cm and 8cm respectively, the length range of the third side should be ().

A, 3cm above b, 13cm above

C, more than 3cm and less than 13cm d, less than 3cm or more than 13cm.

3) The product of two numbers is 0.42. If two numbers are simultaneously expanded by 10 times, the product is ().

a、42 B、4.2 C、0.42 D、0.0042

4) A steel pipe is 3.8 meters long and sawed into sections every 0.7 meters. How many meters are left in the steel pipe? ( )

a，30m b，3m c，0.3m d，0.03m

5) 0.6× 4 means:

How much is six tenths of a plus four? How much is b? What is 0.6 4? How much is C? What is the sum of 4 0.6?

Third, calculation:

1, write directly. 5 points

0. 15+0.5= 0.2÷0. 1= 1.8×6= 1-0.23= 2.5×4=

20×0.5= 0.39÷3= 1.05×5= 2. 16+3.84= 4.8÷ 1.6=

2. Calculation of the following problems can be simplified. 18 point

1) 12.7+ 12.5+0.5 2)2.5×4.6×0.4 3)5.4×99+5.4

4) 68.8+ 1.2×6.5 5)55.4÷(3.94+6.86) 6)7.4×[5.6÷(5.4÷0.9)]

3. Solving the equation: 12 points.

4X-7 = 2 1 4.5X+5.4 = 14.4

5.8X+3.5X-7 = 14.39 13.5-2X = 1.5

4. Xiaoming and Xiaolan play a model ball game, touching one ball at a time at random, and then putting it back, each touching 10 times. Xiao Ming who touches the white ball gets 1 point, Xiao Lan who touches the yellow ball gets 1 point, and Xiao Ming and Xiao Lan who touch other colors get no points. What kind of pocket do you think is fair to touch the ball? 6 points

Three white balls and three yellow balls.

1 red ball and 2 blue balls

Three white balls and two yellow balls.

1 white ball 1 yellow ball

Three red balls and two white balls.

1 yellow ball and 2 blue balls

Fifth, solve the problem. 1 to 4 questions, each with 5 points.

1) A butterfly flies 3.9 kilometers at a speed of 0.5, and the flying speed of bees is 2.4 times that of butterflies. How many kilometers do bees fly per hour?

2) There are two barrels of oil, one of which is 2.5 kilograms, and the price is 35.00 yuan; B 3kg barrel (0.5 kg of the same oil), the price is 48.30 yuan. What kind of oil is cheaper?

3) Students play guessing games. Xiaoling said, "The number I want multiplied by 9, plus 6. 15, is equal to 15.87." Do you know what Xiaoling is thinking? (solved by equation method)

Dad is seven times as old as Lan Lan. I also know that light light blue is 30 years younger than his father. How old are Light Light Light and Dad?

5) Grandma Wang bought a box of 30 fruit popsicles in the cold drink wholesale department, and the price was ***22.5 yuan; A box of 20 cream popsicles, *** 17.2 yuan. At the time of sale, each cream popsicle is 1.5 yuan, and each fruit popsicle is 1.2 yuan. Which kind of popsicle is cheaper at wholesale price? How much did a * * * earn after selling a box of two kinds of popsicles? 9 points

Ability question 20 points

Find a pattern to fill in the blanks. As shown in the figure:

(1) It takes () sticks to swing a triangle;

(2) Put two triangles with a stick ();

(3) It takes () sticks to swing three triangles;

(4) It takes () sticks to swing 15 triangles like this;

(5) Put it like this, a * * *, with 99 sticks, * * * put a triangle like ().