The Main Challenge
You are playing Roll3Dice and have just rolled 2, 5 and 6 with your three dice.
Using these three numbers once each, with + – × ÷ available, it is possible to make SEVEN target numbers in the range 1-10, as indicated below.
Can you place 2, 5 and 6 into the gaps on each line so that all seven calculations work out?
- ◯+◯–◯ = 1
- ◯–◯÷◯ = 2
- ◯+◯–◯ = 3
- ◯×◯–◯ = 4
- ◯×◯–◯ = 7
- ◯+◯÷◯ = 8
- ◯+◯–◯ = 9
For full details, visit Roll3Dice.com or the hashtag #Roll3Dice.
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 Bottom-Left to Top-Right diagonal contains the following seven numbers:
3 9 25 27 33 64 81
Another 2-part challenge for the final day of the year:
Part 1: How many of the listed numbers are neither square numbers nor cube numbers?
Part 2: Use these seven numbers exactly once each, with + – × ÷ available to use in your calculation, to arrive at our favourite target number of 7.
The Factors Challenge
Which THREE numbers below are factors of 366?
2 3 4 5 6 7 8 9
The Mathematically Possible Challenge
Using 4, 8 and 12 once each, with + – × ÷ available, which is the ONLY number it is possible to make from the list below?
90 91 92 93 94 95 96 97 98 99
#NumbersIn90s
The Target Challenge
Can you arrive at 366 by inserting 1, 3, 3, 6 and 6 into the gaps below?
- (◯²+(◯–◯)²)×(◯²–◯) = 366
Answers can be found here.
Click Paul Godding for details of online maths tuition.
