How can counting on help me add two-digit numbers?

NARRATOR: Hello Snoot. Hello Fin.

BOTH: (ALIEN LANGUAGE)

NARRATOR: I see you’re at House of Blobs.

What are you buying?

SNOOT: (ALIEN LANGUAGE)

NARRATOR: Blobs…

I probably could have guessed that.

What an interesting shop.

Have you brought some credits to spend?

Wow!

I see you’ve both been saving up.

How many credits do you have all together?

SNOOT: Er… Wi… Oo…

NARRATOR: Let’s see.

Snoot, you’ve got three stacks of 10 credits, which makes 10… 20… 30 credits.

And Fin, you’ve got…

Well, it’s a bit hard to tell.

FIN: (ALIEN LANGUAGE)

NARRATOR: That’s a good idea, Fin.

Arrange your credits into stacks of 10 to make them easier to count.

1 stack of 10… 2 stacks of 10.

That leaves 4 credits left over.

Two 10s add 4, equals 24.

To work out how many credits there are altogether, just add 24 to 30.

SNOOT: (ALIEN LANGUAGE)

NARRATOR: That’s the way, Snoot.

First, count up all the 10s, then count up the units.

1, 2, 3, 4, 5 10s make 50, and 1, 2, 3, 4 units make 4.

50 add 4 equals 54.

BOTH: Aha!

NARRATOR: I bet you can buy lots of blobs with those.

(BUBBLING)

NARRATOR: Or 1 mega blob…

How are you going to get it home?

(STRAINING)

NARRATOR: Oh dear.

(LAUGHING)