Olympic math problem 1. Xiaohong went upstairs with her father. Xiaohong walks slowly, but Dad walks fast. When Xiaohong went to 1 building, his father had already gone to the second floor. When Xiaohong went to the third floor, which floor did his father go to

2. A fruit group 10 people, 7 people like bananas and 5 people like apples. How many people like bananas and apples?

3. The duckling said it was strange and strange. There is a chicken in the duckling team, counting, it is the sixth, counting backwards, it is the seventh, how many ducklings are there?

4. Find a pattern of filling numbers: ① 5, 7, 9, 1 1, () ②0, 1, 2, 3, 5, 8, ().

5. Fill in the numbers as required: 36, 12, 45, 7, 35, 23, 60, 55 () > () > ()13,24,65438.

6. There is a two-digit number, one is 9 and the other is 4. This two-digit number is ().

7. There are 14 children in a row, red ranks fourth from left to right, and Mingming ranks fourth from right to left, so how many people are there between red and Mingming?

8. The smallest three digits are () and the largest three digits are ().

9. With the numbers 5, 7 and 4, you can arrange () different three digits. Write it separately.

10. It takes 4 minutes to saw a stick into 5 segments, and how many minutes does it take to saw it into 7 segments?

1 1. Calculation: 3+5+7+9+1+03+15+17+19+2/kloc-.

12. There are 14 children playing hide-and-seek games. Six children were arrested. How many children have not been caught?