T he Main Challenge
Here’s a 2-part, 7-step number trail involving all four arithmetical operations.
Part 1: When starting with the number 15, what is your final answer?
- –1
- +2
- ×3
- ÷4
- +5
- –6
- ×7
Part 2: In a separate calculation, what must your starting number be to make your final answer 3.5?
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 2nd & 6th rows contain the following fourteen numbers:
5 8 12 17 18 20 28 33 48 49 55 56 63 64
Which number, when 11 is added to it, becomes a square number?
The Factors Challenge
Which of the following numbers are factors of 255?
2 3 4 5 6 7 8 9 10
[ Today’s Hint: A number is a multiple of 5 if it ends in 5 or 0 ]
The Mathematically Possible Challenge
Using 5, 8 and 11 once each, with + – × ÷ available, which is the ONLY number it is possible to make from the list below?
9 18 27 36 45 54 63 72 81 90
#9TimesTable
The Target Challenge
Can you arrive at 255 by inserting 2, 4, 5, 6 and 10 into the gaps below?
- (◯×◯+◯÷◯)×◯ = 255
Answers can be found here.
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