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You're running 30km? That's very impressive!

Not as easy as you thought, huh?

Don't worry, there's a water station after 3km.

That's three 30ths of the way there

We can simplify that because both three and 30 are divisible by 3.

If we divide both the numerator and the denominator by 3, we can see that you'll be one tenth of the way through the race.

Hey, that's cheating!

There's another water station at 10km.

Both 10 and 30 are have a common factor of 10, so if we divide both by ten, you're one third of the way

This is definitely cheating…

But the next water station is at 18km.

18 and 30 both have a common factor of 6, so if we divide both numbers by 6…you're already 3 fifths of the way.

By the way, I didn't know you could fly a helicopter!