T he Main Challenge
Here’s a special 24game-type challenge with a difference.
Using the numbers 1, 3, 4 and 6 once each, together with + – × ÷ available, it is possible to make lots of different target numbers, not just 24.
For instance:
- to make 1: (3+4–6)×1 = 1
- to make 2: (3+4–6)+1 = 2
- to make 3: (6–4–1)×3 = 3 . . . and so on.
Using the same four numbers, can you make the target numbers 6, 12, 18 and 24?
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 2nd & 6th rows of the playing board contain the following fourteen numbers:
5 8 12 17 18 20 28 33 48 49 55 56 63 64
What is the sum of the multiples of 5?
The Factors Challenge
Which of the following numbers, if any, are factors of 251?
2 3 4 5 6 7 8 9 10 None of them
[ Today’s Hint: An even number cannot divide exactly into an odd number ]
The Mathematically Possible Challenge
Using 5, 8 and 11 once each, with + – × ÷ available, which is the ONLY number it is possible to make from the list below?
5 10 15 20 25 30 35 40 45 50
#5TimesTable
The Target Challenge
Can you arrive at 251 by inserting 10, 20, 30, 40 and 50 into the gaps below?
- (quarter of ◯)×◯–((◯+◯)÷◯)² = 251
Answers can be found here.
Click Paul Godding for details of online maths tuition.
