Tuyển tập đề thi toán học sáng tạo cho học sinh lớp 6 - 8 Tài liệu bằng tiếng anh - Cuộc thi Mathcounts: toán học thật sinh động, gần gũi

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Đánh giá 7 đánh giá
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Cập nhật 25/03/2014

Giới thiệu

Warm-Up 1

1...............cm	What is the length, to the nearest centimeter, of the hypotenuse of the right triangle shown?
2...............cm	If the ratio of the length of a rectangle to its width is 9/4 and its length is 18 cm, what is the width of the rectangle?
3...............bins	Mike bought pounds of rice. He wants to distribute it among bins that each hold 1/3 pound of rice. How many bins can he completely fill?
4...............p.m	It took Jessie 15 minutes to drive to the movie theater from home. He waited 10 minutes for the movie to start, and the movie lasted 1 hour 43 minutes. After the movie ended, Jessie immediately went home. It took Jessie 25 minutes to drive home from the theater. If he left for the movie at 4:05 p.m., at what time did he get home?
5...............$	A carnival pass costs $15 and is good for 10 rides. This is a savings of $2.50 compared to paying the individual price for 10 rides. What is the individual price of a ride without the pass?
6....................	If x + y = 7 and x − y = 1, what is the value of the product x∙y?
7....................	Mrs. Stephens has a bag of candy. The ratio of peppermints to chocolates is 5:3, and the ratio of peppermints to gummies is 3:4. What is the ratio of chocolates to gummies? Express your answer as a common fraction.
8...........degrees	The angles of a triangle form an arithmetic progression, and the smallest angle is 42 degrees. What is the degree measure of the largest angle of the triangle?
9.....................	Each of the books on Farah’s shelves is classified as sci-fi, mystery or historical fiction. The probability that a book randomly selected from her shelves is sci-fi equals 0.55. The probability that a randomly selected book is mystery equals 0.4. What is the probability that a book selected at random from Farah’s shelves is historical fiction? Express you answer as a decimal to the nearest hundredth.
10....................	According to the graph shown, which of the other eleven months has a number of daylight hours most nearly equal to the number of daylight hours in April?