Have a go at these. The answers are at the bottom but don’t cheat.
1. Which number is the odd one out?
84129, 32418, 47632, 36119, 67626, 72927
2. Find five consecutive numbers below that total 23?
947251739244572561854
3. What number replaces the question mark?
1, 2, 6, 12, 36, 72, ?
(Answers to all at bottom of page)
How long did you spend attempting to find the answers? Minutes? Hours?
Were they correct?
Did you feel like you had stretched yourself whilst attempting to work them out?
Answers/Solutions:
1.
| Ans: 47632. |
| Sol. All the others are three digit numbers followed by their square root, eg 361 followed by its square root, 19. |
2. Ans: 457253.
3.
| Ans: 216. |
| Sol. ×2, ×3 repeated. |
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