1, a number written directly.

85÷ 17= 950÷ 19= 144÷ 12= 63÷2 1= 780÷ 13= 630÷2 1=

75÷ 15= 240÷ 15= 380÷ 19= 520÷26= 420÷2 1= 80÷ 16=

200÷25= 500÷25= 400÷25= 1000÷25= 225÷25= 750÷25=

140÷20= 360÷ 18= 630÷70= 95÷ 19= 270÷90= 360÷ 12=

2. Column vertical calculation.

5 16÷43= 279÷93= 888÷74=

3, column recursive equation calculation.

1000-[(480÷96+36)× 12] 253+[(338+565-204)÷3] 375÷(25- 10)× 15

Second, the picture in brackets is "√" and the wrong picture is "×".

1, the quotient of two numbers is 56. If the dividend and divisor are expanded by 10 times, the quotient is still 56. ( )

2. If the dividend is multiplied by 100, then the divisor should also be multiplied by 100 to keep the quotient unchanged. ( )

3. If the divisor is enlarged by 7 times, the divisor should be reduced by 7 times to keep the quotient unchanged. ( )

4. The quotient of two numbers is 160. Dividend and divisor minus four times, the quotient is still 160. ( )

Fill in the blanks as required.

1, what is the smallest number in brackets?

35×()& gt； 382 43×()>； 367 79×()>； 720 68×()>； 420

2. What is the maximum number in brackets?

50×()& lt； 2 10 70×()& lt； 435 28×()& lt； 2 14 49×()& lt； 357

The quotient of 3.222÷37 is () digits, the quotient of 44 1÷45 is () digits, and the quotient of 5 16÷6 is () digits.

Fourth, I will solve the problem.

1, Xiangyang primary school carries out reading activities.

I read 150 books in the fourth grade, 70 more books in the fifth grade than in the fourth grade, and three times as many books in the sixth grade.

(1) How many books have the sixth-grade students in Xiangyang Primary School read?

(2) How many books can 30 primary schools of the same size read in the fourth, fifth, sixth and sixth grades according to the reading volume of Xiangyang primary school?

2. The following table shows the daily sales of some commodities in over the rainbow shopping malls.

Toy Name Unit Price (Yuan) Turnover (Yuan)

Watch (block) 45 540

Badminton racket (branch) 78 702

Table tennis bat (branch) 25 625

Shoes (pairs) 99 990

(1) Which product is the best seller this day?

(2) According to the sales situation on this day, what is the estimated sales volume of these commodities for one month (30 days)?

(3) If you buy shoes from 900 yuan, how many pairs can you buy?

3. From Shanghai to a certain place, the waterway is 2 12km, the highway is 432km, the ship travels for three hours 159km, and the bus travels for four hours at 288km.

(1) Which is faster, the ship or the car?

(2) Now that the ship and the bus leave Shanghai at the same time, who will arrive at the destination first?

Question: Billiards have three colors: red, white and black, of which 23 are red, white, 20 are red and black, and 25 are black and white. How many balls are there in three colors?