Today’s Challenge
Group these ten numbers into five pairs so that the difference between the two numbers in each pair is exactly divisible by seven:
6 17 28 37 45 58 64 78 83 98
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 3rd & 6th rows of the playing board contain the following fourteen numbers:
5 12 13 18 20 25 33 36 42 45 49 56 66 80
From the list, what is the sum of the multiples of 7?
Make 133 Challenge
Can you arrive at 133 by inserting 10, 11, 13 and 20 into the gaps on each line?
- ◯×◯+◯–◯ = 133
- ◯×◯+√(◯–◯) = 133
Answers can be found here.
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