2022年大联盟(Math League)国际夏季四年级数学挑战活动二

Speed Questions, Grade 4 2022 Math League International Summer Challenge (Unofficial version, for reference only) Note: Listed below are the four types of coins currently being minted in United States. a. Penny: 1¢ b. Nickel: 5¢ c. Dime: 10¢ d. Quarter: 25¢ 1. 21 × 22= A) 43 B) 442 C) 462 D) 2122 Answer: C 2. What is the average of 1, 2, 3, 4, 5, 6, and 7? A) 1 B) 4 C) 7 D) 10 Answer: B 3. I have 1 penny, 5 nickels, and 10 dimes. How much money do I have? A) $1.25 B) $1.26 C) $1.50 D) $1.51 Answer: B 4. The digital sum for the year 2022 is 2 + 0 + 2 + 2 or 6. How many years from 2023 to 2500 have a digital sum of 6? A) 10 B) 12 C) 13 D) 14 Answer: B ( 13 ) 学科网（北京）股份有限公司 5. 100% of 50 = 200% of ? A) 25 B) 75 C) 100 D) 150 Answer: A 6. Of the following, which fraction does not equal 2? 3 A) 22 33 B) 4 6 C) 18 27 D) 40 90 Answer: D 7. The sum of two whole numbers is 36. Their greatest possible product is A) 35 B) 260 C) 320 D) 324 Answer: D 8. How many different rectangles does this diagram contain? (Count all rectangles, including squares.) A) 18 B) 24 C) 36 D) 64 Answer: C 9. How many positive prime numbers have ones digit of 5? A) 0 B) 1 C) 5 D) 25 Answer: B 10. If I start with $100, increase this by 50%, then decrease the new amount by 50%, how much money will I have? A) $50 B) $66 C) $75 D) $100 Answer: C 11. Bob earned $33 in 6 days. At the same rate, Bob’s total earnings should be $88 in how many more days? A) 10 B) 14 C) 16 D) 22 Answer: A 12. Of the following whole numbers, which has the fewest number of factors? A) 6 B) 8 C) 10 D) 11 Answer: D 13. 111111 222222 333333 444444 222222 ? A) 1 B) 4 C) 5 D) 10 Answer: C 14. Round 0.999 to the nearest tenth. A) 0.1 B) 0.9 C) 0.99 D) 1.0 Answer: D 15. Ozzie hid his head in the sand 98 hours after 11 P.M. Sunday. Ozzie hid his head on a A) Tuesday B) Wednesday C) Thursday D) Friday Answer: D 16. The ones digit of the product 9 × 9 × 9 × 9 × 9 × 9 × 9 × 9 is A) 1 B) 2 C) 9 D) 0 Answer: A 17. The number