NARRATOR: Yes, that is quite a hard sum. It might be easier if we separate the 17 into a 10 and a 7, and the 14 into a 10 and a 4. That gives us a 10, a 10, a 7 and a 4. Let's start by adding the ...

NARRATOR: Don't worry Snoot. A handy way of working out 5 add 7 is to make 10 first. Take your 5 shells Snoot, and add 5 from Fin's 7, which equals 10. That leaves 2 shells left over. So just add 2 to ...