The Main Challenge
How many 3-digit numbers contain at least two 7’s?
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 4th & 7th columns contain the following fourteen numbers:
3 5 6 9 20 24 28 32 42 50 63 66 72 77
Which FIVE numbers become prime numbers when 5 is added to each of them?
The Factors Challenge
Which numbers below are factors of 347?
3 5 7 9 11 13 None of them
The Mathematically Possible Challenge
Using 1, 3 and 9 once each, with + – × ÷ available, which SIX numbers is it possible to make from the list below?
6 12 18 24 30 36 42 48 54 60
#6TimesTable
The Target Challenge
Can you arrive at 347 by inserting 2, 4, 5, 10 and 20 into the gaps below?
- ◯²–◯²–◯×(◯+◯) = 347
Answers can be found here.
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