1. What comes next? 120, 60, 40, 30, 24, ... ? Answer: (number)

2. Fill in the blank: 0, 2, 6, 12, 20, 30, 42, 56, 72, ... ? Answer: (number)

3. Take a 3 by 3 square. The first row reads: 9, 1, 7. The second row: 8, 2, 4. The third row: 7, 3, ... ? Answer: (number)

4. An easy one, fill in the blank: 100, 81, 64, 49, ... ? Answer: (number)

5. Fill in the blank: 4, 9, 25, 49, 121, 169, ...? Answer: (number)

6. Fill in the blank: 1, -1, 2, -3, 4, -7, 6, -11, 8, -15, 14, ...? -27 -17 -19 -23

7. Fill in the blank: 2, 4, 9, 28, 125, 726, ... ? 2528 6128 4326 5047

8. Take a 3 by 3 square. The first row reads: 1, 3, 10. The second: 2, 2, 8 and the third: 3, 1, ... ? Answer: (a number)

9. Fill in the blank: 1, 2, -1, -4, -9, -54, -61, ... Answer: (number)

10. When I add up the numbers 10, 20, 30, ..., untill 200 (200 included), what will be the sum? Answer: (number)