Number puzzles
| 11) |
Answer: 1 Explanation: Starting with the bottom line of the triangle and moving up, the sum of the digits in each line decreases by 5 each time, from 20 to 5. |
| 12) |
Answer: 26 Explanation: Moving clockwise around the chain, numbers increase by 4, then 3, then 2, before repeating this pattern. |
| 13) |
Answer: 3 Explanation: In each row, the sum of the digits is 10. |
| 14) |
Answer: 4 Explanation: Each row of the grid contains each of the 10 digits, 0 to 9, written in a random order. |
| 15) |
Answer: 43 Explanation: In each triangle, multiply the lower two numbers together and add the upper number to give the value at the centre. |
