Combining Lengths
Start by simply putting rods together to measure different lengths. As you explore, you may make some discoveries that will lead you into the world of number theory.
Measuring with Rods
How many different lengths is it possible to measure with a set of three rods? Explore this problem, and make some discoveries about number bases.
Longer and Longer
Watch our videos to see how we measured different lengths with sets of rods. Then explore which sets of rods are best for measuring longer and longer lengths...
A World Without Ones
If we only had 3p and 7p coins, there'd be some values that we couldn't make. I wonder which ones? Explore this question and find out all about the Frobenius coin problem.
Frobenius Numbers
In this problem, explore the values you can make with different coins, learn about Frobenius Numbers, and discover a way to work them out.