The Main Challenge
This Kakuro-style question invites you to find various number combinations. List the SEVEN different ways of making 12 when adding together three unique digits from 1 to 9.
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 & 3rd rows contain the following fourteen numbers:
2 9 13 14 15 22 25 36 40 42 45 66 72 80
Which number, when doubled, becomes a 3-digit number with two of the digits the same?
The Factors Challenge
Which of the following numbers are factors of 309?
3 5 7 9 11 13 None of them
The Mathematically Possible Challenge
Using 3, 8 and 10 once each, with + – × ÷ available, which is the ONLY number it is possible to make from the list below?
100 101 102 103 104 105 106 107 108 109
#Numbers100to109
The Target Challenge
Can you arrive at 309 by inserting 3, 4, 6, 8 and 9 into the gaps below?
- ((◯+◯)×◯+◯)×half◯ = 309
Answers can be found here.
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