Today’s Challenge
Of the numbers 1, 2, 3 . . . 6000, how many are NOT multiples of 2, 3 or 5?
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 & 5th rows of the playing board contain the following fourteen numbers:
3 6 7 10 16 21 32 35 44 50 54 60 81 84
What is the average of the two prime numbers on the list?
Make 89 Challenge
Can you arrive at 89 by inserting 1, 4, 8 and 10 into the gaps on each line?
- ◯²+◯²+◯–◯ = 89
- ◯×◯+(◯–◯)² = 89
- (◯+◯)³–double(◯+◯) = 89
Answers can be found here.
Click Paul Godding for details of online maths tuition. Wherever you are in the world, please get in touch.
