We have wished them luck, but we also want to pay tribute to how far they have come. So we will show you the first problem each grade had to tackle in our Math Marathon and then the last one. Look at the difference in their complexity.
Third grade's first answered question back in October:

Their last question in May:

The fourth grade's first answered question in October:

Their last answered question in May:

The fifth grade's first answered question in October:

And their last question in May:

What a difference. That's a lot of learning!