The Main Challenge
Here is an interesting logic puzzle for you to try.
Insert the numbers 1-9 into the correct positions in this 3-by-3 grid after studying the seven clues below. Each number should appear exactly once.
x x x
x x x
x x x
Here are the clues:
- The 2 is directly left of the 1,
- The 6 is directly right of the 7,
- The 8 is directly above the 9,
- The 9 is directly right of the 5,
- The 3 is further left than the 7,
- The 4 is directly below the 3,
- The 5 is in the very central position of the grid.
The 7puzzle Challenge
The playing board of the 7puzzle game is a 7-by-7 grid containing 49 different numbers, ranging from 2 up to 84.
The 1st & 4th columns contain the following fourteen numbers:
3 6 13 20 21 22 27 42 55 56 60 63 72 77
What is the difference between the sum of the lowest seven numbers and product of the two highest ones?
The Factors Challenge
The Mathematically Possible Challenge
Using 5, 6 and 12 once each, with + – × ÷ available, which are the only TWO numbers it is possible to make from the list below?
60 61 62 63 64 65 66 67 68 69
#NumbersIn60s
The Target Challenge
Can you arrive at 331 by inserting 1, 3, 11, 13, 31 and 33 into the gaps below?
- (◯–◯)×◯+◯–◯–◯ = 331
Answers can be found here.
Click Paul Godding for details of online maths tuition.