Friday 8 April 2011

Getting started...

There are 10 teachers at a BLIP meeting.
Being a friendly bunch, they all decide to shake hands.

If they are to only shake hands with each person once, how many handshakes need to take place?
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14 comments:

  1. Dan8 April 2011 at 10:26

    I have no idea!

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  2. Andrea8 April 2011 at 10:26

    Thanks for this!

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  3. Kate and Jane8 April 2011 at 10:26

    90
    10 people in the group would shake hands with the other 9 memebers of the meeting. THey would not shake hands with themselves.
    10x9 = 90

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  4. Fliss8 April 2011 at 10:27

    I'm not sure all teachers would shake hands - what if there are two teachers from the same school?

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  5. Launton8 April 2011 at 10:27

    Hello!

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  6. margaret8 April 2011 at 10:27

    I'm not sure how to work this out - could be good fun to act it out with children and then work out the system. 'See the maths'. The answer might be a long time coming!

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  7. Andrea8 April 2011 at 10:27

    Is i 90? (10 x 9?)

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  8. Anonymous8 April 2011 at 10:27

    Sally thinks its 10 factorial but its a long time since her degree

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  9. mrsg8 April 2011 at 10:27

    I think that Kate and Jane are correct. I defer to their superior knowledge.
    Sandy

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  10. Ben8 April 2011 at 10:28

    9+8+7+6+5+4+3+2+1

    44?

    Not sure...

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  11. Anonymous8 April 2011 at 10:28

    I would do 10+9+8+7 etc.

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  12. Kate and Jane8 April 2011 at 10:30

    Well done Ben!!!!!!!!

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  13. Mr D. Kirby8 April 2011 at 13:33

    Well done to all of you having a go! The answer is 45.

    Ben had the correct method - well done.

    You might want to think about how you could make the addition a bit easier...

    HINT: Think about pairs of numbers...

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  14. Mr D. Kirby8 April 2011 at 14:27

    Perhaps one of you could try and explain why Ben is right...?

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