1, 100.5438+003 is pronounced as () and 50.50 is written as ().
2. A number consists of five tens and 10%. This number is written as ().
3. In a triangle, it is known that ∠ 1= 720, ∠2= 480 and ∠ 3 = (); The base angle of an isosceles triangle is 45o. This triangle must be a () triangle (classified by angle).
4.9.0968 Be accurate to the tenth place (), and keep two decimal places () and integers ().
5. Reduce 25 to 0.025 and move the decimal point 7.8 to the right by two places ().
6. Write 306,900 as a number () in "ten thousand" and change 687,430,000 into a number () in "hundred million".
7. put ">" in ○. , "<, or" = ".
4 tons 50 kg ○4.5 tons 25× 100- 1× 25 × 99
Xiaohong, Xiaoqing and Xiaolan bought the same pencil at the same time. Three days later, Xiaohong used 2.03 cm, Xiaoqing used 2.45 cm and Xiaolan used 1.9 cm. Among them, () the remaining pencil is the longest.
9. A two-digit decimal approximation is 3.8, the maximum number is (), and the minimum number is ().
10,2.15 hours = () hours () minutes 3.05kg = () kilograms () grams.
Second, choose a "corresponding seat". (Choose the number of the correct answer and fill in the brackets)
1, the following statement is true ().
A. The second digit to the right of the decimal point is ten digits. B.c. 0.26 and 0.260 have different counting units, but the size is the same.
2. If the two sides of a triangle are 30cm and 40cm respectively, the length of the third side should be selected from the following three quantities, and only () can be selected. A.50 cm B.70 cm C.80 cm
3. The circumference of the circular flower bed is 30 meters, and a pot of flowers is placed every 3 meters on its side, which requires a pot of flowers. A. 1 1 B. 10 C.9
4. The number closest to 10 is () a.10.01b.9.998c.9.9 5. Four equilateral triangles with the same size cannot be combined into one ().
A. triangle B. parallelogram C. trapezoid
Third, judge whether the following questions are true or false.
() 1, the longer the two sides of the angle, the larger the angle. ( )
2. Move the decimal point 1.3 three places to the right, which is 1300. ( )
7 thousand kilometers is 7 kilometers. ( )
4. At eight o'clock, 15 is 8 15. ( )
5、 14.090= 14.09。
Fourth, "clever calculation" is right and fast. (***36 points)
1, the number written directly: (0.5 points for each small question, ***5 points)
2.5+0.9= 4.7-2.8= 120×6= 5÷ 100 = 5.5-5= 0.3× 1000= 0.4+6.7= 8-4.6= 72÷9×7= 35+24- 12=
2, vertical calculation and checking calculation. (2 points for each small question, ***4 points)14.53+5.67 7.2-6.45 6.3+12.8
3. Calculate the following questions as simply as possible.
1.29+3.7+0.7 1+6.3 19 × 96 + 962 ÷ 74 400 -( 1300 ÷ 65 + 35) 23.4 - 8.54 - 1.46 6.75 + 0.5 - 4.86 1 9 × 36 –36 × 9 425 ÷ 25 + 575 ÷ 25 (320 + 280)÷ 50 × 4 ( 1 17+43)×(84 ÷ 7)
5. Go into life and solve problems.
1. Xiaolan's mother took 50 yuan to buy food. Buy meat dishes 28.75 yuan, buy vegetarian dishes 6.35 yuan. How much is left?
2. Dongdong weighs 38kg, my cousin weighs half as much as him, and my father weighs four times as much as my cousin. How much does dad weigh?
Miss Wang bought two reference books. Math teaching guide 12.56 yuan, math manual is cheaper than math teaching guide, 2.5 yuan. How much should Mr. Wang pay?
The grain store delivered 20 bags of rice and 20 bags of flour, 30 kilograms of rice and 25 kilograms of flour each. How many kilograms more rice is brought in than flour?
5. Eggs and duck eggs collected by Chunlei Farm on Monday weigh 480kg, and each 15kg is packed in a box, with 20 boxes of eggs. Is the duck egg preparation 10 box enough?