First, read the questions carefully and fill in the blanks carefully. (65438+ 0 points per grid) (**25 points)
1. If the decimal point of 82.46 is removed, the number obtained is () times the original number.
2. Comparing 18.20 and 18.2, their () are equal, but () are different.
3. Three decimal places are accurate to the percentile of 19.64, with the maximum number being () and the minimum number being ().
4.8.996 Keep one digit after the decimal point as () and two digits after the decimal point as ().
5. According to "2.3× 0.2 = 0.46, 0.8× 1.2=0.96, 0.96+0.46= 1.42", the comprehensive formula is: ().
6. According to 15.6÷24=0.65, write the result of the following formula.
( 1) 1.56÷24=( ) (2) 156÷2.4=( )
(3)6.5×24 =( ) (4) 15.6÷0.24=( )
7.8.3739 Keep two decimal places as () and three decimal places as ().
8.A ÷ 4 = 1.25, and A is ().
9. The cyclic part of the cyclic decimal18.4553 ... is ().
10.a×5×b can be abbreviated as ().
1 1.m is a natural number, and the two adjacent natural numbers are () and ().
The number 12.2 greater than 3 times of x is expressed as ().
13. The number A is 3b, the number B is less than the number A, and the number B is ().
14. if a× b > a (a ≠ 0), then b must be () 1.
15. Xiao Qiang is one year old, Xiaohong is two years older than him, and Xiaohong is () years old.
X years later, Xiao Qiang was () and Xiaohong was ().
Second, carefully scrutinize and judge carefully. (Mark "√" for the right and "×" for the wrong. ) (* * * 5 points)
1. is greater than 0 times 1.0 1, and the product must be greater than the original number. ( )
2.3.6×(99+ 1)=3.6×99+ 1。 ( )
3.A2= A×2 .( )
4.8x+8 is an equation. ( )
5.2.56÷0.4=25.6÷4。 ( )
Third, compare repeatedly and choose carefully. (Fill in the serial number of the correct answer in brackets) (**5 points)
1. The formula that can be simplified by using the multiplicative associative law is ().
a . 1.3×8.9+ 1.3× 1 b . 16.38+9.45+90.55
C.87× 1.25×8
2. Looking at ""from the front, we can see that the shape of the figure is ().
A. BC
3. Observing a cuboid or square, you can see at most () faces at a time.
A. 1 B.2 C.3
4. According to the law of multiplication and distribution, xy+y can be written as ().
A.(x+y)y B.x+2y C.(x+ 1)y
5. The solution of the equation "38X=0" is ().
A.x = 38 b.x = 0 C. I can't be sure.
Fourth, don't worry at all, calculate carefully. (***37 points)
1. Write the number directly. (9 points)
4.5×3= 0.92×5= 1.2×0=
5.6÷0.7= 4.08÷8= 2.4÷0.24=
1÷0.4= 1.07+ 1.3= 2.8-0.28=
2. Calculate the column vertically and check it by multiplication. (6 points)
( 1) 18.9÷2.7= (2)364÷5.2=
3. Calculate the following questions. If you can use a simple algorithm, you should use a simple method. (18)
( 1)0.25×8.75×4 (2)25.8×7+3×25.8
(3) 1.08×0.8÷0.27 (4) 1.8÷0.5÷0.6
(5)2 1.36÷0.8- 12.9 (6)48.6÷ 18÷9
4. Solve the equation. (4 points)
( 1)X-7=8.5 (2) 5X = 1.5
Five, live learning and use, solve problems. (***28 points)
1. Only a formula, not a formula. (4 points)
(1) A train traveling at a constant speed travels 450 kilometers in 4.5 hours, and travels at the same speed for 6.6 hours. How many kilometers can it travel?
(2) Class 5 of a primary school (1) bought 4 boxes of drinks, each containing 24 bottles, each bottle 1.50 yuan. How much is a * * *?
An engineering team built an 87-kilometer canal with 48 kilometers left. How many kilometers were built? (column equation solution) (4 points)
The two bags of rice A and B weigh 24.6 kilograms. If 4.5 kg is taken out of bag A and put into bag B, the quality of the two bags of rice is equal. How many kilograms of rice are there in a bag? (5 points)
At the Beijing Olympic Games, Jamaican Bolt won the men's 100 meter championship in 9.69 seconds. How many meters does he run per second? (Keep two decimal places) (5 points)
5. A bookstore has a Chinese dictionary, each of which is 18.50 yuan. Teacher Chen bought this dictionary with 100. How many copies can he buy? (5 points)
6. My sister and my sister both like to learn math. My sister gave her two unknown questions (as follows). Please help her figure out the number represented by each letter or Chinese character. (5 points)
(1) 1 A 8 (2) Good student
-B A+ study hard.
1 2 3 6 6 6
A= () Good = ()
B= () research = ()
Health = ()