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Speaker 1: Lewis?

Speaker 2: Yeah?

Speaker 1: We need to change this bolt, and make sure it's the correct one.

Speaker 2: OK.

Speaker 1: It might need measuring.

Speaker 2: OK, no problem. (TO AUDIENCE) So I've been asked to replace this bolt that's been worn down.

I'm not sure what size the bolt is, so I'll need to measure it.

I've got the vernier caliper as it allows me to take really accurate measurements.

I'll then need to get the new bolt and replace it.

I'll need the spanner for that.

But these spanners are in inches.

So once I've measured the diameter of the bolt head in millimetres, I'll then need to convert the diameter to inches.

I can use the vernier caliper for this again, as it has both metric and imperial measurements on it.

I need to measure the diameter here, the distance across the entire bolt head.

That's 13 millimetres. Now to find a replacement.

Speaker: Right, I've got the bolt, now to replace it.

I'll need the right size spanner.

These are measured in inches, but my bolt is in millimetres.

I'll use the vernier caliper to convert the millimetres to inches.

The bolt is 13 millimetres, that's equivalent to 1.3 centimetres.

If I trace up to the level where it shows inches, here it is, that's just over half an inch.

So I need a half-inch spanner.

Now we need to get this bolt off.

Well, that fits.

Speaker 1: How you doing, all done?

Speaker 2: Yeah, all done, I used a vernier caliper to convert millimetres to inches.

Speaker 1: You won't always have that tool to use.

You want me to show you how to convert centimetres to inches without using it?

Speaker 2: Yeah.

Speaker 1: First, we've gotta convert millimetres to centimetres.

To do that, you divide 13 by 10, which equals 1.3.

Now to convert the centimetres, we multiply by 0.39. One centimetre is 0.39 inches.

Speaker 2: So it's 1.3 times 0.39.

Speaker 1: Yes.

Speaker 2: 0.507 inches?

Speaker 1: Yeah, that's right, it's about half an inch.

Speaker 2: OK, thanks, Phil.

Speaker 1: No problem.