The Main Challenge
Here’s another Mathelona challenge based on my popular number puzzles.
Can you make all four lines work out arithmetically by filling the 16 gaps with digits from 0 to 9? Remember, each digit can only be inserted a maximum of TWICE:
◯ + ◯ = 7 = ◯ + ◯
◯ + ◯ = 4 = ◯ – ◯
◯ + ◯ = 6 = ◯ × ◯
◯ + ◯ = 3 = ◯ ÷ ◯
Full details of our pocket book of challenges 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 1st & 6th rows contain the following fourteen numbers:
2 5 9 12 14 15 18 20 22 33 40 49 56 72
What is the sum of the multiples of 11?
The Factors Challenge
Which is the ONLY one of the following numbers that is a factor of 282?
4 6 8 10 12 14 16 18
The Mathematically Possible Challenge
Using 2, 7 and 10 once each, with + – × ÷ available, which are the only TWO numbers it is possible to make from the list below?
10 20 30 40 50 60 70 80 90 100
#10TimesTable
The Target Challenge
Can you arrive at 282 by inserting 1, 2, 3, 4 and 5 into the gaps below?
- (◯²×(◯+◯)–◯)×◯ = 282
Answers can be found here.
Click Paul Godding for details of online maths tuition.
