Today’s Challenge
Your starting number is 18 and your task is to arrive at the same final answer. There are ten arithmetical steps from beginning to end, each one involving a whole number, but the 9th (and penultimate) step is missing! What must it be?
÷2 +3 –8 ×6 +4 –3 ÷5 ×2 ? ×2 = 18
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 4th & 6th rows contain the following fourteen numbers:
3 5 10 12 18 20 32 33 35 44 49 54 56 60
What is the difference between the lowest and highest multiples of 4?
Make 59 Challenge
Can you arrive at 59 by inserting 4, 5, 6 and 10 into the gaps on each line?
- ◯×◯+◯–◯ = 59
- ◯²+◯×◯+◯ = 59
- (◯+◯)×◯–◯ = 59
Answers can be found here.
Click Paul Godding for details of online maths tuition. Wherever you are in the world, please get in touch.
