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School2009
- 1. MATH COUNTS 2009School Competition Countdown Round
- 2. Please note thatvideotaping, photographing, reproducing or publishing the following questions or answers is strictly prohibited. A sample question follows that you are allowed to reproduce. MATH COUNTS
- 3. A 3-ounce canof tomato sauce costs $1.68. In cents, what is the price per ounce? Sample Question
- 4. Answer: 56(cents) Sample Question
- 5. MATH COUNTS 2009School Competition Countdown Round
- 6. 1. A regularhexagon can be divided into six equilateral triangles. If the perimeter of one of the triangles is 21 inches, what is the perimeter, in inches, of the regular hexagon?
- 7.
- 8. 2. What isthe value of 8(2) − 3! + 5?
- 9.
- 10. 3. Four standardsix-sided dice are rolled. What is the probability that the product of the numbers on the top faces of all four dice is a prime number? Express your answer as a common fraction.
- 11.
- 12. 4. What is of 90?
- 13.
- 14. 5. Two-thirds ofthe students at Baker Middle School take music. There are 834 students who take music. How many students are there at Baker Middle School?
- 15.
- 16. 6. The productof two positive integers is 36. The difference of the same two integers is 9. What is the value of the larger integer?
- 17.
- 18. 7. A squareand four circles, each with a radius of 5 inches, are arranged as shown. What is the area, in square inches, of the square?
- 19. Answer: 400 (sqinches)
- 20. 8. What isthe sum of 22 ones, 22 tens and 22 hundreds?
- 21.
- 22. 9. When January1st falls on a Thursday, on what day of the week is February 8th in the same year?
- 23.
- 24. 10. What isthe largest sum that can be obtained when each of the digits 1, 2, 3, 4, 5, 6, 7, 8 and 9 is used exactly once to form 3 three-digit integers which are then added together?
- 25.
- 26. 11. Ten consecutiveintegers between −9 and 9 are chosen. What is their product?
- 27.
- 28. 12. If theproduct xy = 28 when y = 196, what is the value of x ? Express your answer as a common fraction.
- 29.
- 30. 13. The ratioof girls to boys in Ms. Snow’s math class is 3:2. If there is a total of 45 students, how many girls are in Ms. Snow’s math class?
- 31.
- 32. 14. Three dingsand five platts cost $125. Each platt costs $10. What is the cost, in dollars, of five dings?
- 33.
- 34. 15. A giftshop offers free gift wrapping. They have eight varieties of wrapping paper, three colors of ribbon, and four types of gift cards. Using one variety of wrapping paper, one color of ribbon and one type of gift card, how many combinations are possible?
- 35.
- 36. 16. The lengthand width of a rectangle are each increased by 20%. By what percent is the rectangle’s area increased?
- 37.
- 38. 17. What isthe smallest positive value of x such that x + 5678 results in a palindrome?
- 39.
- 40. 18. Lori sellscars and gets a 15% commission on each sale. How much did a car sell for, in dollars, if Lori earned a $3,000 commission?
- 41.
- 42. 19. Define theoperation as a b = . What is the value of 2 (4 7)?
- 43.
- 44. 20. Whatis the smallest positive integer d for which 2009 + d is a multiple of 11?
- 45.
- 46. 21. When35 12 is written in decimal notation, what is its ones digit?
- 47.
- 48. 22. Howmany seconds are in 7.8 minutes?
- 49.
- 50. 23. Astudent accidently added five to both the numerator and denominator of a fraction, changing the fraction’s value to . If the original numerator was a 2, what was the original denominator?
- 51.
- 52. 24. Theperimeter of a square with side length x units is equal to the circumference of a circle with radius 2 units. What is the value of x ? Express your answer as a decimal to the nearest hundredth.
- 53.
- 54. 25. Theword MATH is repeatedly written producing the pattern MATHMATHMATH… If the pattern is continued, what letter will occur in the 2009th position?
- 55.
- 56. 26. Whatis the remainder when 5000 is divided by 60?
- 57.
- 58. 27. Whatis the product of the first four prime numbers?
- 59.
- 60. 28. Whatis the value of the expression ? Express your answer as a common fraction.
- 61.
- 62. 29. Whatis the value of the expression (−5) 3 + (−2) 3 + 2 3 + 5 3 ?
- 63.
- 64. 30. When writtenin standard form, how many zeros are in the product (9.2 × 10 2 )(8 × 10 6 )?
- 65.
- 66. 31. If 28 = 4 x , what is the value of x ?
- 67.
- 68. 32. Kim hasexactly enough money to buy 40 oranges at 3 x cents each. If the price rose to 4 x cents per orange, how many oranges could she buy?
- 69.
- 70. 33. From agroup of six students, how many different four-student committees can be chosen?
- 71.
- 72. 34. What isthe least common multiple of 72 and 96?
- 73.
- 74. 35. A linepasses through (0, 5) and (−5, 0). Which of the four quadrants will the line not pass through?
- 75. Answer: Fourth (quadrant),(quadrant) 4, or IV
- 76. 36. What is in simplest radical form?
- 77.
- 78. 37. Connie’s patiois a square composed of 64 unit squares. How many additional unit squares would be required to expand Connie’s patio into a square with a side length one unit greater than the side length of the original patio?
- 79. Answer: 17 (unitsquares)
- 80. 38. If thelengths of two sides of a right triangle are 5 and 12 units, what is the least possible length, in units, of the third side? Express your answer in simplest radical form.
- 81. Answer: (units)
- 82. 39. A shirtregularly priced at $30 is on sale for 20% off. Mary has a coupon that will take another 25% off of the sale price. What single percent discount would give the same final price as the two successive discounts?
- 83.
- 84. 40. What isthe reciprocal of the sum of the reciprocals of 6 and 8? Express your answer as a common fraction.
- 85.
- 86. 41. Whatvalue of x satisfies (5 x )(12 x ) = 17 x ?
- 87.
- 88. 42. Inwriting the integers from 10 through 99 inclusive, how many times is the digit 6 written?
- 89.
- 90. 43. At11:00 a.m. how many degrees are in the smaller angle formed by the minute hand and the hour hand of the clock?
- 91.
- 92. 44. Whatis of of of 27? Express your answer as a common fraction.
- 93.
- 94. 45. Afurniture store had a sale with 30% off all items. If the sale price for a chair was $42, what was the original price, in dollars?
- 95.
- 96. 46. Whatvalue of k makes the positive five-digit integer k 3,57 k divisible by 18?
- 97.
- 98. 47. Agardener has 2009 pansies to be planted in a square flower bed. If she wants to have 45 pansies in each row and in each column, how many more pansies are needed?
- 99.
- 100. 48. Whatis the greatest common factor of 252 and 96?
- 101.
- 102. 49. Aset of three numbers has both a mean and median equal to 4. If the smallest number in the set is 1, what is the range of the set of numbers?
- 103.
- 104. 50. Arectangular room measures 12-feet by 6-feet. How many square yards of carpet are needed to cover the floor?
- 105. Answer: 8 (sqyards)
- 106. 51. Whatis the smallest positive four-digit integer that is the product of two consecutive integers?
- 107.
- 108. 52. Whatis the largest factor of 54,321 that is less than 54,321?
- 109.
- 110. 53. Themeasures of two complementary angles are in the ratio 8:1. How many degrees are in the larger angle?
- 111.
- 112. 54. Whatis of 20% of of 240?
- 113.
- 114. 55. Eachof four circles has a radius of 4 inches. A larger circle has an area equal to the total area of the four smaller circles. What is the length of the radius, in inches, of the larger circle?
- 115.
- 116. 56. Howmany one-and-one-half-inch-long pieces of string can be cut from a two-foot-long piece of string?
- 117.
- 118. 57. Whatis the smallest positive integer that is a multiple of both 30 and 40 but not a multiple of 16?
- 119.
- 120. 58. Andreanotices that the 40-foot tree next to her is casting a 10-foot shadow. How tall, in inches, is Andrea if she is casting a 15-inch shadow at the same time?
- 121.
- 122. 59. Billcan buy jags, jigs and jogs for $1, $2 and $7 each, respectively. What is the largest number of jogs he can purchase if he must buy at least one of each item and will spend exactly $50?
- 123.
- 124. 60. If , then what is the value of n ?
- 125.