Fill in the blanks.
1. Two digits times two digits, and the product may be () digits or () digits.
2. To calculate 340×20, multiply () by () to get (), and then add () zeros at the end of the product to get ().
3. Fill in the appropriate name in () below.
() × () = distance efficiency× time = ()
Single output × () = total output × () = total price
4. Omit the mantissa after the number and find the divisor.
728≈( ) 39 1≈( ) 7094≈( )
Judge whether it is true or not (mark "√" for the right and "×" for the wrong).
1. If one factor remains the same, another factor is expanded by 10 times, and the product is expanded by 10 times. ()
2.6980=7000( )
3. There are three zeros at the end of two factors and at least three zeros at the end of the product. ()
4. Know the price of each pencil and the quantity of pencils bought, and find out how much a pencil costs, which is the unit price. ()
5.8 46 plus 20 46, the formula is 46× (8+20) ().
Third, the calculation problem
1. orally calculate the following questions.
18×4= 45×20= 4×9+7=
2 10×3= 130×4= 8×4+9=
12×60= 80×70= 7×7+3=
50×30= 300×30= 0× 17+ 13=
400×20= 430×2= 0× 17+ 13=
2. Vertical calculation.
74×58= 260×27= 146× 15=
306×32= 270×30= 195× 18=
3. Recursive equation calculation.
7250-87×80 (58+86)×60 137×(86-79)
Fourth, the text questions.
What is 1.48+05?
2. One number is 102, and the other number is 87, which is less than 25 times this number. What is the other number?
Verb (abbreviation of verb) application problem.
1. A basketball 32 yuan. The school bought 18. How much should I pay?
There are 68 white rabbits and 57 black rabbits on the farm. The number of chickens is 12 times that of rabbits. How many chickens have you raised?
3. There are 42 people in one car and 35 times as many people in the train. How many people are there on the train than on the bus?
4. A six-story building. There are 22 steps from the first floor to the second floor and 20 steps from the second floor to the sixth floor. How many steps are there in this building?
Reference answer
I, 1. Three, four 2.34, two 68 and two 6800.
3. Speed, time, total amount of work, quantity, unit price, quantity 4.700,400,7000.
Two. 1.√ 2.× 3.√ 4.× 5.√
Three. 1. Omit 2.4292, 7020, 2 190, 9792, 8 100, 35 103.290, 8640, 959.
Four. 1.720 2.2463
5. 1.576 yuan 2. 1500 3.438+0428 people.
4. 102 (there are 4 steps from the second floor to the sixth floor, ***80, plus 22, *** 102).
Unit test 2
1.
(1) When calculating (2000-36× 47) ÷ 44, first use the calculate () method, and finally use the calculate () method.
(2) 180× 650-320 ÷ 80, if you want to change the operation order, you must first calculate the subtraction, then you must use parentheses, and the formula is _ _ _ _ _ _ _ _.
(3) According to 500 ÷ 125 = 4.4+404 = 408, 804-408 = 396, the comprehensive formula is _ _ _ _ _ _ _.
(4) It was originally planned to be completed on 2 1 day, but it was actually completed () days in advance.
(5) Five people weave 80 baskets in four days, and each person weaves () baskets every day.
The number A is 52 times that of B. 。
① If B is 364, then A is ();
② If the number A is 364, then the number B is ().
(7) What is the difference between the quotient of 78 and 82 divided by 585 and 265? The comprehensive formula is ().
(8) Divide 182 by the quotient of 13 and multiply it by the difference between 28 and 14. What is the product? The comprehensive formula is ().
(9) A meteorological team did not get the daily temperatures of 365438 0℃, 33℃, 34℃, 32℃, 30℃, 35℃ and 29℃ respectively. The temperature difference this week is ()℃, and the average temperature this week is ()℃.
(10) adapted the formula into an application problem.
5×(3+7):___________________________
5×3+7:______________________________
2. True or false. (tick "√" for the right and "×" for the wrong, ** 10).
(1)75×8 represents the sum of eight 75s. ()
(2) The number less than 200 times 2 is 198. ()
(3) If the number of B is less than the number of A by 2, the number of A is more than the number of B by 2. ()
(4) A is 3 times that of B, B is 2 times that of C, and A is 6 times that of C.. ()
(5) Decimal must be less than integer. ()
(6) One percent is greater than one tenth. ()
(7) The sum of the minuend, subtraction and difference is equal to twice that of the minuend. ()
(8)25×4÷25×4= 1( )
(9)436- 198=436-200-2( )
(10) If loom A weaves C meters in b hours, then each loom weaves C \a \b meters in an hour ().
3. multiple choice questions.
(1) A number is 1 multiple of B number, and A number () B number.
①> ②= ③