![I'm Eight](/sites/default/files/styles/medium/public/thumbnails/content-98-11-bbprob2-icon.png?itok=y1X7RsxW)
Mental calculations
![I'm Eight](/sites/default/files/styles/medium/public/thumbnails/content-98-11-bbprob2-icon.png?itok=y1X7RsxW)
![Roll these Dice](/sites/default/files/styles/medium/public/thumbnails/content-98-10-bbprob2-icon.png?itok=cj85bw5d)
problem
Roll these Dice
Roll two red dice and a green dice. Add the two numbers on the red dice and take away the number on the green. What are all the different possible answers?
![Integrated sums sudoku](/sites/default/files/styles/medium/public/thumbnails/integrated-sums-sudoku.png?itok=unV-tRm5)
page
Integrated sums sudoku
The puzzle can be solved with the help of small clue-numbers which
are either placed on the border lines between selected pairs of
neighbouring squares of the grid or placed after slash marks on the
intersections between two diagonally adjacent squares.
![Clever Carl](/sites/default/files/styles/medium/public/thumbnails/content-id-2478-icon.png?itok=QAFM91Xe)
article
Clever Carl
What would you do if your teacher asked you add all the numbers from 1 to 100? Find out how Carl Gauss responded when he was asked to do just that.
![Build it up](/sites/default/files/styles/medium/public/thumbnails/content-id-10592-icon.png?itok=QjqjP4l_)
problem
Build it up
Can you find all the ways to get 15 at the top of this triangle of numbers? Many opportunities to work in different ways.