Working out 10% of an amount
Watch the video to see some examples of how you can open a conversation and ask your colleagues for suggestions and ideas.
Speaker: I'm just getting ready to go out for dinner with a few friends from work.
I work at a clothes shop in town, which is great, because I get my staff discount.
Maths was never my favourite subject and until last year I used to avoid it, which was making things difficult at work and home.
But I did start this new course in town and then it's given me a much better understanding of how to go about solving a maths problem.
Like tonight, for example, I know that we'll probably have to work out splitting the bill and tips.
Say we decide to leave a tip of 10%.
How do I go about calculating 10% of the total bill?
Usually I would just leave it for someone else to sort out, but actually I know that to find 10% of any amount you just divide by 10.
And we've just been learning new ways of working that out at college.
Tonight I might actually have a go myself at working it out!
How do you find 10%?
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Finding 10% of the bill
Watch the video to see some examples of how you can open a conversation and ask your colleagues for suggestions and ideas.
Speaker 1: Right, guys, so how do you want to go about sorting this?
Speaker 2: Should we just split it, and add 10% for a tip?
Speaker 1: (TO AUDIENCE) Cool, so now I can use what I learned in college to figure out the percentage.
First I need to figure out what 10% is so I can add it on before we split it.
Well, I know that any percentage can be written as a fraction of 100.
So 100% is the same as 100/100 and 10% is 10/100.
If I divide the top and bottom by 10 I get 1/10, so 10% equals one tenth.
And because it's a tenth, I know I should divide by 10.
(TO OTHER PEOPLE) If you could just bear with me, I just want to try this new trick that I learned at college.
(TO AUDIENCE) If I write this out like this it makes it dead easy for me.
And to divide by 10, I just need to move everything over one column to the right.
(TO OTHER PEOPLE) OK, so the tip is £11.18.
(TO AUDIENCE) Now add that to £111.80 to get the overall total.
Add a 10% tip to a bill amount
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Working out the cost per person
Watch the video to see some examples of how you can open a conversation and ask your colleagues for suggestions and ideas.
Speaker: (TO OTHER PEOPLE) So if we add the £11.18 then that comes to £122.98 - is everyone happy with that?
So £122.98 divided by seven is £17.57, so I suppose it would be easier if we all just rounded it up to £18 each then?
(TO AUDIENCE) I'll just double check that's right. 18 × 7 is £126.
Add a tip and split the bill
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