1. When calculating 567-67× 5, first calculate (67× 5) and then calculate (567-335), and the result is (232).
2. Add 0 to a number to get (the original number); Divide 0 by 1 (a non-zero number) to get 0.
3. The second digit to the right of the decimal point is (percentage), and its counting unit is (percentage (or 0.0 1)).
4.0.53 contains (53) 0.0 1. (0.5) if one decimal place is reserved.
5.98400200=(0.984002) billion ≈( 1) billion (keep one decimal place).
6.3. The decimal point of14 is (0.03 14) and the decimal point (reduction) is (100) times; If you move the decimal point of 3. 14 by (two) places, the decimal point will be expanded to (100 times) the original number.
7. According to the angle, triangles can be divided into (acute triangle), (right triangle) and (obtuse triangle).
8. Xiao Ming is calculating (28+22) ×? When I left out the brackets, the result was 358. He found mistakes in the inspection and recalculated. The correct result of his calculation should be
Yes (750).
2. True or False: (4 points)
1. An isosceles triangle with an angle of 60 must be an equilateral triangle. (right)
2. There is no largest natural number, but there is the largest decimal number. (error)
3, 5 kg 30 g =5.3 kg. (error)
4. Eight percentage points written as decimal is 0.08. (right)
Three. Multiple choice questions: (4 points)
1. Move the decimal point three places to the right and then two places to the left. This decimal point is (2).
(1) the size is unchanged; ② Enlarged by 10 times; ③ Reduce 10 times; ④ Enlarged by 1000 times.
2.98× 1 01= 98×100+98×1= 9898, simplified by multiplication (1).
This is easy to calculate. ① Distribution Law ② Exchange Law ③ Association Law
3. The three line segments below each group cannot form a triangle (2).
①2cm 16cm 17cm②3cm 8cm 5cm③5m 7m 9m。
4. There are (4) decimals between 0. 1 and 0.9.
1 7 2 8 3 9 4 countless.
Fourth, the calculation questions:
1. Numbers written directly: (4 points)
150×6=900 0.72-0.28=0.44 0.57+0.9= 1.47 3.8+0. 12=3.92
10-0.09=0.9 1 5÷ 1000=0.005 10-6.5+3.5=7 15.3+ 1.85= 17. 15
2. Vertical calculation and checking calculation: (4 points)
3.906+0.66=906.66 28.56- 14.76= 13.8
3. Calculate by simple method: (6 points)
1.30.7+0.7 1+6.3 125×89×8 57× 10 1–57
=(3.7+6.3)+30+0.7 1 = 125×8×89 =57× 10 1-57× 1
= 10+30+0.7 1 = 1000×89 =57×( 10 1- 1)
=40.7 1 =89000 =5700
4. Calculate the following questions: (6 points)
72.8-8.6+5.84 400-( 1300÷65+35) 86.7-( 14.3-3.8)
Verb (abbreviation of verb) solves problems: (12 points)
1, the weight of apples in baskets * *180kg. After selling half of the apples, the basket weighs 92 kilograms. How much does a basket of apples weigh? How much does this basket weigh?
92×2= 184 (kg) 184- 180=4 (kg) 180-4= 176 (kg)
A: The barrel weighs 4kg, and the apple weighs 176kg.
The school held a sports meeting. There are 76 participants in the third grade, and the number of participants in the fourth grade is exactly twice that of the third grade. How many people are there in Grade One, Grade Three and Grade Four?
76+76×2=228 (person) A: There are 228 people in the third and fourth grades.
3. A factory transported coal 184 tons, and used coal 15 tons on average every day for the first eight days. The rest is expected to be used up in four days. How many tons are there on average every day?
15×8= 120 (ton) 184- 120=64 (ton) 64÷4= 16 (ton)
Answer: The average daily coal consumption is 16 tons.
4. Engineer Li designed a rectangular flower bed with a width of15m for the Citizen Square. Later, he increased the width of the flower bed by 8 meters, so the area of the flower bed increased by 240 square meters. What is the area of this flower bed now?
240÷8=30 (meters) 30×( 15+8)=690 (square meters)
Now the area of Huapu is 690 square meters.