NARRATOR: Hello Snoot, hello Fin.
What a great sand castle!
SNOOT: (ALIEN LANGUAGE)
NARRATOR: You’re going to decorate it as well. What with?
SNOOT: (ALIEN LANGUAGE)
NARRATOR: Lesser spotted splarkle shells.
Very decorative.
How many shells do you have?
You’ve got 5 splarkle shells Snoot, and Fin, you’ve got 7.
How many shells is that altogether?
SNOOT: Er… Oh…
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 10 and what do you get?
12 shells all together.
FIN: (ALIEN LANGUAGE)
NARRATOR: Oh right, Fin.
You only need 6 shells to decorate your sand castle.
That means you can take away 6 from 12 and just leave the rest.
How many does that leave?
FIN: (ALIEN LANGUAGE)
NARRATOR: OK Fin, you want to take away 6 from 12 by counting back through 10 as well.
12 minus 2 equals 10, so to get 10, just take 2 of the 6 shells away.
That leaves you with 4 shells to take away.
And what’s 10 take away 4?
That’s right, 6!
BOTH: Aha!
NARRATOR: But how do you know which shells to use and which to leave?
(POP)
NARRATOR: Ah… Maybe you should just leave them all?
Description
Adding by making 10 is also called bridging through 10. Snoot and Fin use bridging through 10 to add and subtract shells at the beach.
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