The Main Challenge
Your task is to make all four lines below work out arithmetically by placing digits from 0 to 9 into the 16 gaps, but each digit can only be used a maximum of twice!
Can you complete this Mathelona challenge?
◯ + ◯ = 9 = ◯ + ◯
◯ + ◯ = 3 = ◯ – ◯
◯ + ◯ = 8 = ◯ × ◯
◯ + ◯ = 2 = ◯ ÷ ◯
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 & 5th rows contain the following fourteen numbers:
2 6 7 9 14 15 16 21 22 40 50 72 81 84
What is the sum of the multiples of 7?
The Factors Challenge
Which of the following numbers are factors of 261?
3 5 7 9 11 13 None of them
The Mathematically Possible Challenge
Using 5, 8 and 11 once each, with + – × ÷ available, which are the only TWO numbers it is possible to make from the list below?
90 91 92 93 94 95 96 97 98 99
#NumbersIn90s
The Target Challenge
Can you arrive at 261 by inserting 1, 2, 3, 4 and 5 into the gaps below?
- (◯×◯×◯)²+(◯+◯)² = 261
Answers can be found here.
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