五年级第二学期数学自测

江苏扬州中学教育集团树人学校 王 烨 编

I. Calculate.

II. Fill in the blanks.

(1) 723cm= ______m.

(2) The digit in the tenth value place of the number 109.38 is______ .

(3) There are ______ hundredth in the number 9214.038.

(4) ______ is 0.03 more than 12.44.

(5) The value of the underlined digit in 38.437 is ______ .

(6) If one pencil box costs 9.50 yuan, the cost of 5 pencil box is______ .

(7) Round 300.075 to the nearest whole number. 300.075 ≈______ .

(8) 1.243 is ______ greater than 1.24 and ______ less than 1.25.

(9) The length of a rectangle is 16dm, and its width is 22dm. The area of the rectangle is ______dm2.

(10) The value of 20.356 ÷ 15 ≈ ______ when rounded to 2 decimal places.

(11) 1, 2, 3 and 6 are the factors of ______ .

(12) The lowest common multiple of 32 and 40 is ______ .

(13) Δ ÷ 30 = 216, so Δ = ______ .

(14) The perimeter of a rectangle is 26cm, and the length is 7cm.The width is ______cm.

(15) In Δ ABC, ∠A = 45°, ∠B = ∠A. The degree of ∠C is______°.

III. True(√) or false(h)? Read and judge.

(1) 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, and 11 are natural numbers. ( )

(2) -5, -4, -3, -2, -1, 0, 1, 2, 3, 4, and 5 are integer numbers. ( )

(3) 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, and 11 are positive numbers. ( )

(4) -1, -2, -3, -4, -5, -6, … are negative numbers. ( )

(6) 0.1, 0.38, 1.64, and 7.83 are fractions. ( )

(7) 1, 3, 5, 7, 9, 11, 13, and 15 are odd numbers. ( )

(8) 2, 4, 6, 8, 10, 12, and 14 are even numbers. ( )

IV. Circle the correct option, A, B, C or D.

(1) If one eraser costs ¥0.99, the cost of 8 erasers is ______.

(2) Multiply 40.026 by 5. The product is ______.

(3) 40.106 is ______ when rounded to the nearest 2 decimal places.

(4) 35.509 is ______ when rounded to the nearest 2 decimal places.

(5) The length of a rectangle is 20cm. The area of the rectangle is 1060cm2. The width of the rectangle is ______cm.

(6) The width of a rectangle is 28m.The perimeter of the rectangle is 136m. The area of the rectangle is ______m2.

(7) 9 + (3 + 4) = 16, so, (9 + 3) + 4 = ______.

(8) What is the missing number? 2 + (□+ 4) = (2 + 6) + 4.

(9) The lowest common multiple of 32 and 40 is ______.

(10) Find the highest common factor of 48, 54 and 72.

V. Solve the problems.

(1) One sandwich costs ¥6.45. How many sandwiches can Jenny buy for ¥40.5? How much change can she get?

(2) Find the shaded area of the parallelogram.

(3) The total weight of 18 oranges and 4 pears is 5.84kg. If each pear weighs 0.38kg, what is the average weight of the 18 oranges?

(4) A light f lashes every 4 minutes and a bell rings every 5 minutes. If the light f lashes as the bell rings at the same time,how long will it be until this happens again?

(5) Jack is 9 years old and his mother is 39 years old now. In how many years, will his mothers’s age be twice Jack’s age?

(6) In the rectangleABCD, there is a squareEFGD. The area of the shaded part is 90cm2. AE = 8cm, and CG = 3cm. Find the area of the squareEFGD.

（参考答案见本期第18页）