The Main Challenge
A number puzzle associated with our board game, Mathematically Possible, an excellent resource involving mental arithmetic and strategy. Further details can be found by clicking the link.
Using the numbers 1, 3 and 6 once each, with + – × ÷ available, which one of the following numbers is NOT mathematically possible to make?
2 4 6 8 10 12 15 18 21 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 1st & 7th columns contain the following fourteen numbers:
5 9 13 21 22 24 27 28 32 50 55 56 60 66
Which two numbers become square numbers when 9 is added to them?
The Factors Challenge
Which of the following numbers are factors of 323?
3 5 7 9 11 13 15 17 19 None of them
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?
5 10 15 20 25 30 35 40 45 50
#5TimesTable
The Target Challenge
Can you arrive at 323 by inserting 2, 3, 3, 4 and 4 into the gaps below?
- ◯⁴+◯³+◯²–◯×◯ = 323
Answers can be found here.
Click Paul Godding for details of online maths tuition.
