# The light has come on!

Discussion in 'Personal' started by Goldopals, Mar 14, 2012.

1. ### GoldopalsNew commenter

Something happened in Maths today that was very special (at least to me). One of my year 10s has been struggling with multiplying surds and I was helping her friend with a question. All of a sudden, this girl tilted her head to the side and had a funny expression on her face. You could see in her mannerisms that something had 'clicked'!
I thought it was amazing that I got to see the moment when a struggling student just 'got it' and got excited about it!

2. ### GoldopalsNew commenter

Something happened in Maths today that was very special (at least to me). One of my year 10s has been struggling with multiplying surds and I was helping her friend with a question. All of a sudden, this girl tilted her head to the side and had a funny expression on her face. You could see in her mannerisms that something had 'clicked'!
I thought it was amazing that I got to see the moment when a struggling student just 'got it' and got excited about it!

3. ### anon4561

Well done! I remember a similar moment in Music, when I was doing intervals. It was a hot day, and the kids wanted to sit outside in the shade, so I took my accordion, and gave them a physical demonstration.... One kid gave me a similar look, and proclaimed loudly "Ah! NOW i get it!" ... his marks went on to improve amazingly after that, as he believed he just couldn't understand, and it built his self-confidence enough to try and accept other new concepts. Congratulations!

4. ### giraffeNew commenter

I love it when that happens. Well done!

5. ### GoldopalsNew commenter

Thanks It is the first time that that has happened so it was rather exciting!

It is indeed a magical moment. Their entire face and posture changes as the penny drops

7. ### angiebabeOccasional commenter

I'm sorry but I don't understand 'multiplying surds'?

8. ### chocolateworshipperOccasional commenter

Surds are numbers left in 'square root form' (or 'cube root form' etc). They are therefore irrational numbers. The reason we leave them as surds is because in decimal form they would go on forever and so this is a very clumsy way of writing them.

9. ### midgey

Good heavens! have these surds been around for long?

10. ### AnonymousNew commenter

A surd is a square root of a number that is not an integer e.g. sqr root 3.
A square root of a number times by itself must be that number. That's the definition of a square root
Oh no, we have to do sqr root 3 x sqr rt 3 = sqr rt 9 = 3 (they need that extra step)
And then they get it! Sometimes
I'm still waiting for some of mine to get histograms!!

11. ### Kinsa

My light has just gone out...

12. ### anon2980

Mine too.
Maths never was my strong point.

13. ### angiebabeOccasional commenter

My light has faded into oblivion tooooooooooooo!!!!!!!!!!!!!!!!!!!!!

14. ### CestrianNew commenter

I <u>really</u> don't remember them from O level Maths - were they called something different?

15. ### Ruthie66New commenter

they weren't in O Level - we did some index rules but surds weren't in it - I'm trying to get my head round them but I always have to check in the book when I have to support a student with it.

16. ### angiebabeOccasional commenter

Poor students is all I can say.

17. ### anon2980

Before today, I thought that surds were what a Geordie got when adding water to Fairy Liquid...
[disclaimer - other detergents also available].

18. ### AnonymousNew commenter

I blame the teachers.
OK - L.O. To understand what a surd is.
What is the square root of 4?
2
What is the square root of 5?
ummm. Gets out calculator.
2.122323445 (I haven't checked so don't tell me)
Well, that's a bit long to write down so we call it sqrt root 5 (that's the square root symbol btw)
Now - let's go for a harder one.
sqrt root of 20 is the same as the sqrt root (4 x 5)
Which is the same as sqrt root 4 x sqr root 5
We know sqrt 4
Miss, miss - is it 2?
Yes, well done, Have a reward note home. So the sqr root 4 x sqr root 5 is the same as 2 x sqrt root 5
We leave the sqr root 5 in surd form (that means we don't work it out) so the answer to the sqr root of 20 = 2sqrt5
What use will this be when I leave school?
It will help you get a GCSE. Now turn to p100 and do the exercise. Meanwhile I will interrupt your work in 5 minutes because I have to return to the LO and I will do a mini plenary in 10 minutes. Followed by a peer assessment (your friend will mark it).
Outstanding or what - have we all made exceptional progress?

20. ### modelmakerOccasional commenter

Tick. 10/10 and a gold star. See me after the bell goes for a snog and a share of the apple you gave me.