Using The Bar Model For "More Than" Comparison Problems

Hi, I'm Zoe and in this video.

Today we're going to look at how.

We can use the bar model for solving comparison problems.

This is a problem where we've generally got two things we know the relationship.

Between and a total altogether. Children often struggle with these to know.

Where to start, which operation to use. It's really useful to use the bar model so they can see it clearly.

Here's our problem.

Kieran has five more shells in his.

Collection than his sister Hope.

Altogether, they have 23 shells.

How many do they each have? Okay, so we're going to start with Hope.

Hope has some shells, so we're going to label this bar with a question.

Mark for the unknown some shells.

Kieran has five more. Now we know Kieran must then start.

With the same amount as as Hope.

But he has five more.

So we can add on to this.

Bar and we can label this with five shells.

Altogether, they have 23 shells, so we.

Know that those must add up to 23 shells.

Now the bar makes it really clear.

These are the same.

We have these five extra.

We can now remove the five from.

The 23 to find out what's left.

So 23 take away five equals 18.

So we know these two bars here.

Must make 18 shells.

Hopefully pupils then realise that we can.

Half it because these bars are the same.

18 divided by 2 equals 9.

We now know each of these bars is 9 shells. Going back to our model, we can replace our unknown or question mark with nine. We now know Hope has nine shells.

We can read that off straight away.

Kieran, we have to do a little bit of work. Kieran has nine plus five shells.

So altogether Kieran has 14 shells and.

That'S how we use our bar model.

To solve comparison problems.