Number puzzles
| 16) |
Answer: 2 Explanation: Working in rows, the sum of numbers in each row follows the sequence 5, 10, 15, 20, 15, 10, 5. |
| 17) |
Answer: 4 Explanation: Adding up the digits in each oval shape, as you move down the column this total increases by 2 each time, from 12 to 22. |
| 18) |
Answer: 96 Explanation: Moving from left to right, numbers follow the sequence of square numbers, from 6 to 10, subtracting 4 each time. |
| 19) |
Answer: 2 Explanation: The diagram represents a multiplication sum : 128 x 2 = 256. |
| 20) |
Answer: 5 Explanation: The numbers in the lower circles equal the numbers in corresponding segments in the upper circles multiplied by two, then subtract 3 for the left hand circle, 4 for the middle and 5 for the right hand circle. |
