Today’s Challenge
From the numbers below, eliminate all square numbers, triangular numbers, multiples of 4 and factors of 70.
1 2 3 4 5 6 7 8 9 10 12 14 15 16 18 20 21 24 25
Which is the only number left remaining?
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 difference between the lowest and highest multiples of 5?
Make 53 Challenge
Can you arrive at 53 by inserting 4, 4, 5 and 6 into the gaps on each line?
- (◯+◯)×◯+◯ = 53
- ◯²+◯×◯+◯ = 53
- ◯²×◯–(◯+◯) = 53
Answers can be found here.
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