Xiao Qiang caught a cold recently, and the doctor asked him to drink no less than 2000ml of water every day. His glass contains 250 ml of water at most, so he must drink at least (8) glasses of water every day.
3. A two-digit decimal is 3.0, and the maximum value of this two-digit decimal is (3.04). (Is it round? Either 3.09)
4. When a number is expanded to 100 times, it is 64, and this number is (0.64).
5. A chair is N yuan, and the price of a table is 6 times that of a chair, so a set of tables and chairs is 7n yuan.
6. The area of a parallelogram is 32 square centimeters, the base is 4 centimeters, the height is (8) centimeters, and the area of a triangle with the same height is (16) square centimeters.
Second, I am the best judge of right and wrong!
1, a number divided by a decimal, the quotient may be a decimal. (√)
2. The equation must be an equation. (√)
3, a number multiplied by 0.8, the product is smaller than the original number. (√)
The area of triangle is half that of parallelogram. (√)
5. When the decimal is divided by the decimal, the quotient must be a decimal. (×)
6. The median and average of a set of data may be equal. (√)
Third, it is easy to choose.
1, 0.795 two decimal places are (b).
a、0.79 B、0.80 C、0.8
2. The following (b) is the equation.
a、x+3？ b、x+3=7 C、x+9
3, observe a cuboid in a position, can see at most (c) at a time.
A face. B, two sides? C, three faces
4. Triangle and parallelogram have the same area and the same base. The height of triangle is 1.6 decimeter, and the height of parallelogram is (c) decimeter.
a、 1.6？ b、3.2？ c、0.8
Fourth, calculation
1, a number written directly.
2.5x2=5 0.24/0.3=0.8？ 0. 108/0.0 1=? 10.8 7. 1- 1.7=5.4
6. 18/0.6= 10.3 ? 0. 12+0.8 = 0.92 0.2x 500 = 100？ 1.4x0.5=0.7
0.6/3=0.2 ? 0.4x0.5=0.2？ 8. 1/0.8 1= 10 1.4/0.4=3.5
2. Calculate the following questions (simplify them if you can).
60-2.3x 12 50x(0.8+0.4)？ 8.88 x9+8x 1. 1 1
=60-27.6 =50x 1.2？ =8.88*9+8.88
=32.4 ? =60 =8.88*(9+ 1)
=8.88* 10
=88.8
3.05/0.25/4 ? 4.27/0.7x 1.3？ 18.9- 18.9/ 1.4
= 3.05/(0.25 x4)= 6. 1x 1.3 = 18.9- 13.5
=3.05/ 1 =7.93 =5.4
=3.05
3. Solve the equation.
5x-7.8=20.2 2.5x-x= 1.8？ 4x+8x= 120
Solution: 5x=20.2+7.8? Solution: 1.5x= 1.8 solution: 12x= 120.
5x=28 x= 1.2？ x= 10
? x=5.6
Fifth, solve the problem.
1 a food factory produces 1645 bags of yuanxiao every week, and each 18 bag is a box. How many cartons do these yuanxiao need?
1645/18 ≈ 91(pieces) 9 1+ 1=92 (pieces)
A: We need 92 such cartons for the whole Lantern Festival.
Mom went to the mall and bought 3 boxes of toothpaste and 2 bags of washing powder. A * * * 30.8 yuan, a bag of washing powder 6.7 yuan. How much is a box of toothpaste?
Solution: set a box of toothpaste x yuan.
3x+2x6.7=30.8
3x+ 13.4=30.8
3x=30.8- 13.4
3x= 17.4
x=5.8
A: A box of toothpaste, 5.8 yuan.
The circumference of the square flower bed is 4.8 meters. How many square centimeters is the area of this flower bed?
4.8/4= 1.2 (m)1.2x1.2 =1.44 (cm2)
A: The area of this flower bed is 1.44 square centimeters.
Grandpa is 75 years old, five years older than Xiaoming. How old is Xiaoming this year (equation solving)
Solution: Let Xiaoming be X years old this year.
5x+5=75
5x=75-5
5x=70
? x= 14
A: Xiaoming is 14 years old this year.
\(^o^)/YES！
(ˇ? ˇ)? Think about it ~
Hope to be satisfied