fill (up) a vacancy
The 10 times of (1)4.75 is (47.5), 4.5 contains (9) 0.5, half of 3.25 is (1.625), and three times of 1.3 is 3.9.
(2) 9.9546 Keep one decimal place (10.0) and two decimal places (9.95).
(3) Wang Gang handled four parts in five minutes, with an average of 0.8 minutes for each part.
⑷5 divided by the sum of 2.7 and 1.3, the quotient is (1.2).
The counting unit of 0.78 is (0.0 1), and the unit of (100) is 1.
[6] Arrange the five numbers 8.2, 8.23, 8.23 and 8.23 in descending order ().
Once, the divisor quotient of two numbers is 0.64. If the divisor is enlarged by 1000 times and the divisor is reduced by 10 times, the quotient is (640).
The number A is 9.6, which is greater than the number B by 1.2, and the average of the two numbers is (9).
Levies 4 hours 15 minutes =(4.25) hours, 5 kilometers and 30 meters = (5.03) kilometers.
4.3 square meters = (4) square meters (30) square decimeter,1.05t = (1050) kg.
⑽ Make a square with an area of (0.09) m2 with a 1.2m long iron wire.
Second, judgment.
(1) 2.97 17 1 ... is an infinite decimal and a cyclic decimal. (ton)
(2) When dividing two numbers, the quotient must be less than the dividend. (6)
(3) Decimal is less than integer (f)
(4) The sum of the decimal places of two factors is 3, and the decimal places of the product must also be 3. (6)
⑸ 2.5÷0.4 = 6…… 1 (F)
Third, choose
(1) In the following formula, the number equal to 394650-476 is (c).
a 394.65÷47.6 B 3946.5÷4.76 C 394.65÷4.76
(8,000) 0.01equals 80.
A 8000 B 800 C 80
(3) The result of 0.25× 0.4 ÷ 0.25× 4 is (1.6).
A 1 B 0.4 C 0. 16
(4) There are (a) decimal places * * * greater than 5. 1 less than 5.9.
innumerable
5] In multiplication, if one factor is magnified 3 times and the other factor is magnified 5 times, then the product is magnified (c) times.
A 5 B 8 C 15
Fourth, calculation
(1) Write grades directly (6 points)
2.5×40 = 100 1.25×80 = 100 9÷45 =0.2 10-0. 1 =9.9
88÷0.88 = 100 9.8+ 1. 12 = 10.92 6. 1-0.0 1 =6.09 0.9×0.0 1 =0.009
8×0.45 = 0.5+ 1÷0.5 = 0.2×3÷0.2×3 = 0.3×0. 14 =
(2) Use vertical calculation (1 and 2 should have two decimal places, and 3 and 4 should be checked)
3.26×0.52 7.24÷2 1
0.756÷0. 18 0.072×0. 15
(3) The calculation of the first equation can be simplified.
2.43×99+2.43 25-7.8+(6.2+ 1.6 1÷0.23)
20-(2.4+2.4× 1.25) 4.58+2.39+(5.42+7.6 1)
Verb (abbreviation of verb) formula calculation
What is the sum of (1)2.535 divided by 13 6.5?
(2) The difference between 4.8 and 0.8 is multiplied by 5, and the product is divided by 2.5. What is the quotient?
Six, application questions
(1) The canteen brought in 225 tons of coal, which was used for seven days 105 tons. At this rate, how many days can the rest be used?
(2) Xiao Gang and his classmates bought three pens, gave them to 20 yuan, the shop assistant, and took them back to 0.8 yuan. How much is the average pen?
(3) The factory delivers 1.08 tons of raw materials, which is planned to take 4.5 days and actually saves 0.06 tons of raw materials every day. How many days can these raw materials actually be used?
(4) A pile of fuel weighs 60 tons. First, transport it eight times by a truck with a load of 3.5 tons, and then transport the rest by a truck with a load of 3.2 tons. How many times will it take to complete?