The Main Challenge
. . . is from Volume 1 of our Mathelona pocket book. You have a limited amount of numbers to work with, so can you make all three lines work out arithmetically by filling the 12 gaps with these numbers?
1 2 2 2 3 4 4 4 8 8 8 8
◯ + ◯ = 5 = ◯ – ◯
◯ + ◯ = 16 = ◯ × ◯
◯ + ◯ = 4 = ◯ ÷ ◯
Full details of our popular number puzzle can be found by clicking Mathelona.
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 2nd & 3rd rows contain the following fourteen numbers:
8 13 17 25 28 36 42 45 48 55 63 64 66 80
There are two numbers on the list that are consecutive. What is their sum?
The Factors Challenge
Which of the following numbers are factors of 295?
3 5 7 9 11 13 15
The Mathematically Possible Challenge
Using 8, 10 and 12 once each, with + – × ÷ available, which is the ONLY number it is possible to make from the list below?
80 81 82 83 84 85 86 87 88 89
#NumbersIn80s
The Target Challenge
Can you arrive at 295 by inserting 3, 3, 4, 5 and 6 into the gaps below?
- (◯³÷◯–◯²+◯)×◯ = 295
Answers can be found here.
Click Paul Godding for details of online maths tuition.
