Rob Eastaway

speaker

207 appearances 8 recordings 1 series first heard Sep 2010 last heard 3 Jun

Rob Eastaway’s voice in public audio — every appearance, attributed to the second.

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More or Less · Back to school · 10 Sep 2010 podcast

We've got a couple. matched

The starting point for multiplication these days is actually to start with an array and just do dots in an array. matched

You could obviously count them, but very quickly you realise, well, actually there's my tables involved here, seven rows of eights, seven eights. matched

56 and that's how to start with a multiplication now let's do 7 times 14 we could actually do that as an array so you're going to end up with this array of 7 dots 7 rows and 14 dots now you could count those up but can you see that you can actually split this box of dots up so that matched

Instead of saying 7 times 14, you could divide it into 10 and 4. matched

So you could say, well, 7 times 10, everyone do that in their heads? matched

70. matched

And then what's left? matched

Let's take the sum I gave you at the beginning. matched

There was 322 divided by 14. matched

And let's suppose this time it's 322 sweets and we're putting 14 in every bag. matched

How many bags are we going to need? matched

So I'm going to take away a chunk of 10 because I know 10 lots of 14 is 140. matched

I've already taken 10 bags away. matched

How many does that leave me with? matched

So... matched

So I've taken 140, and I work out what I've got left, which is 182. matched

And I can take, as Claire so rightly says, I could take another 140 away from that. matched

So I've taken another bunch of 10. matched

So, so far, I've taken 20 bags away from this, and I'm left now with 42. matched

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