Curriculum textbook institute primary school mathematics curriculum textbook development center

1. Calculate the following problem in a simple way.

102×4.5

7.8×6.9+2.2×6.9

5.6×0.25

8×(20- 1.25)

Second, calculate the following questions.

2.95×5.4

1.43×0.67 (the number is reserved to two decimal places. )

6.84÷0.36

7.9÷0.35 (Numbers are reserved to two decimal places. )

Third, solve the following equation.

3x-48

=

Seventy two

5.9 -2.4 times

=

seven

x÷2.6

=

0.8

Fill in the form.

1. In other words, the cyclic decimal 0.72727 ... is (

).

Xiaolan has a black rabbit, two of which are three times more than black rabbits.

) A white rabbit.

3. The base of an isosceles triangle is 15cm, the waist is a cm and the height is b cm. The circumference of this triangle is (

) cm, the area is (

) square centimeters.

4. The parallelogram has an area of 33.6 ㎝, a base of 8.4㎝ and a height of (

) centimeters.

5. The median of this set of data in the table below is (

), the average is (

).

172

146

140

142

140

139

138

143

6.

5. Calculate the area below.

6.( 1) The four knitting machines of Yimei Company knitted 2227m colored rope in 8.5 hours. How many Besty ropes can each knitting machine weave per hour on average?

(2) Yimei Company wants to weave Chinese knots with these colored ropes. Each Chinese knot needs 3.6 meters of colored rope. How many Chinese knots can this batch of colored ropes knit at most?

Seven, two paving teams at the same time from both ends of the construction of 2070 meters road. Team A is 46m a day, and Team B is 44m a day. How many days will it be ready?

Last month, the number of visitors to the Science and Technology Museum reached 6.5438+0.378 million, of which the number of children was 654.38+0.6 times that of adults. How many children and adults visited the Science and Technology Museum last month?

Nine, Xiaoping and Xiaoling play military chess, and decide who will play first by touching playing cards. They choose four playing cards, two of which are hearts and the other two are spades. Touch one of the four playing cards with their backs facing up. If the cards touched by two people are of the same color, Xiaoping plays chess first; If the colors are different, Xiaoling will play chess first. Please answer the following questions:

(1) The possibility of finding two cards with the same color is (

).

(2) The possibility that two cards have different colors is (

).

(3) Are the rules of the game fair? (

).