The Main Challenge
Another mini-Mathelona challenge where you must place the eight digits 1, 1, 1, 2, 2, 3, 4 and 5 into the eight gaps so both lines work out arithmetically:
◯ + ◯ = 3 = ◯ – ◯
◯ + ◯ = 4 = ◯ × ◯
Click Mathelona for details of our popular pocket book of challenges.
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 1st & 4th rows of the playing board contain the following fourteen numbers:
2 3 9 10 14 15 22 32 35 40 44 54 60 72
Which five numbers listed can be made by adding two others from the list?
The Mathematically Possible Challenge
Based on our best-selling arithmetic board game.
Using the three digits 2, 6 and 9 once each, with + – × ÷ available, which are the only THREE numbers it’s possible to make from the list below?
7 14 21 28 35 42 49 56 63 70
#7TimesTable
The Target Challenge
Can you arrive at 144 by inserting 4, 6, 9 and 12 into the gaps on each line?
- ◯×◯×(◯–◯) = 144
- ◯×◯×double(◯–◯) = 144
- ◯×◯×(◯÷◯)² = 144
- ◯²×(◯+◯–◯) = 144 (2 different ways!)
- ◯×◯+treble(◯×√◯) = 144
Answers can be found here.
Click Paul Godding for details of online maths tuition.
