Math Olympiad 2( Week 25 Quiz 5) 2. What is the number with 7 tens and 4 ones? 3. A week has 7 days. How many days will be in 5 weeks and 3 days? 4. A rectangle has 4 angles. Cut the rectangle into two parts by a straight line. Now, count the total number of angles of the two parts. What is the most number of angles possible in total? 5. A rectangle has 4 angles. Cut out an angle by a straight line. What is the most number of angles possible in the remaining part? 6. Find the result of 8 + 39 = ? 7. Find the result of 36 − 18 − 12 = ? 8. Is the sum of 8 + 12 + 12 + 14 + 2 + 6 an odd number? 10. Below is a calendar of a certain month in a certain year. When you add up all the numbers in a column, you get a column sum. Which column has the smallest sum? | SUN | MON | TUE | WED | THU | FRI | SAT | |
| | | | 1 | 2 | 3 | 4 | | 5 | 6 | 7 | 8 | 9 | 10 | 11 | | 12 | 13 | 14 | 15 | 16 | 17 | 18 | | 19 | 20 | 21 | 22 | 23 | 24 | 25 | | 26 | 27 | 28 | 29 | 30 | | | 11. By flipping a page upside down, some page numbers still show the exact same numbers. Examples of such page numbers are 1, 69, 808,.... How many such numbers are there from 1 to 73 inclusively? 12. Find the sum of 1 + 3 + 5 + 7 + 9 + 11 + 13 + 15 + 17 + 19 + 21 = ? 13. Below is a calendar of a certain month in a certain year. When you add up all the numbers in a column, you get a column sum. Which column has the largest sum? | SUN | MON | TUE | WED | THU | FRI | SAT | |
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | | 8 | 9 | 10 | 11 | 12 | 13 | 14 | | 15 | 16 | 17 | 18 | 19 | 20 | 21 | | 22 | 23 | 24 | 25 | 26 | 27 | 28 | | 29 | 30 | 31 | | | | | 14. There is a 2-digit odd number, and its two digits are 7 and 4. What is the number? 15. If there are 4 Fridays within February in a leap year, which of the following can not be the 2nd day of the month? |