The Main Challenge
Another Mathelona challenge with a difference; no addition calculations at all.
Your task is to make all four lines work out arithmetically by filling the 16 gaps with digits from 0 to 9. Each digit can only be inserted a maximum of TWICE:
◯ – ◯ = 9 = ◯ × ◯
◯ – ◯ = 7 = ◯ ÷ ◯
◯ – ◯ = 5 = ◯ × ◯
◯ – ◯ = 3 = ◯ ÷ ◯
Full details of our popular number puzzle can be found by clicking Mathelona.
The 7puzzle Challenge
The playing board of the 7puzzle game is a 7-by-7 grid of 49 different numbers, ranging from 2 up to 84.
The 1st & 6th rows contain the following fourteen numbers:
2 5 9 12 14 15 18 20 22 33 40 49 56 72
Which two numbers, when doubled, are also on the list?
The Factors Challenge
Which of the following numbers are factors of 284?
2 4 6 8 10 12 14 16
The Mathematically Possible Challenge
Using 2, 7 and 10 once each, with + – × ÷ available, which FOUR numbers is it possible to make from the list below?
2 3 5 7 11 13 17 19 23 29
#PrimeNumbers
The Target Challenge
Can you arrive at 284 by inserting 5, 6, 8, 9 and 11 into the gaps below?
- (◯²+◯²)×√◯–(◯+◯) = 284
Answers can be found here.
Click Paul Godding for details of online maths tuition.
