The Main Challenge
This is a number trail involving ten arithmetical steps. Be careful with your calculations – and no calculators please!
Start with the number 40, then:
- multiply by 4
- +10%
- subtract 15
- divide by seven
- add nine
- 1/2 of this
- +87
- double this
- –96
- ÷10
What is your final answer?
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 & 4th columns contain the following fourteen numbers:
3 6 13 20 21 22 27 42 55 56 60 63 72 77
What is the product of the highest number and lowest number?
The Factors Challenge
Which is the ONLY number below that is not a factor of 330?
2 3 5 6 9 10 11 15
The Mathematically Possible Challenge
Using 5, 6 and 12 once each, with + – × ÷ available, which FIVE 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 330 by inserting 3, 5, 10, 11 and 15 into the gaps below?
- ◯×◯×(◯–◯–◯) = 330
Answers can be found here.
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