How Can This Question Appear in Primary School Mathematics?

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How Can This Question Appear in Primary School Mathematics?

Postby senseimichael » Mon Jun 17, 2013 4:13 pm

https://fbcdn-sphotos-b-a.akamaihd.net/hphotos-ak-prn2/983972_10151447636046516_1084462540_n.jpg

This comes from Nanyang Primary School. I do not believe that children have been taught interior angles of polygons (and this is not even a convex polygon) in primary school.

Can someone enlighten me how a primary school kid is expected to solve this using the tools at their disposal?
Last edited by senseimichael on Mon Jun 17, 2013 9:11 pm, edited 1 time in total.

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Re: How Can This Question Appear in Primary School Mathemati

Postby senseimichael » Mon Jun 17, 2013 4:21 pm

I posted too fast. I see it now, how the three angles tessellate to form a 180 degrees line when placed together. Amazing the kind of questions that educators can come up with.

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Re: How Can This Question Appear in Primary School Mathemati

Postby SAHM_TAN » Mon Jun 17, 2013 4:33 pm

How to find angle a? Thanks.

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Re: How Can This Question Appear in Primary School Mathemati

Postby senseimichael » Mon Jun 17, 2013 4:37 pm

You will notice that all the three angles are present in a straight line.

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Re: How Can This Question Appear in Primary School Mathemati

Postby iFirefly » Mon Jun 17, 2013 4:39 pm

Did you mean Nanyang Primary Sch? Nanyang Girls' Sch is a Sec Sch..
What level is this question taken from?
My DS2 can solve this problem.. He is currently in P5..

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Re: How Can This Question Appear in Primary School Mathemati

Postby SAHM_TAN » Mon Jun 17, 2013 4:50 pm

Is it 100 degrees?

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Re: How Can This Question Appear in Primary School Mathemati

Postby iFirefly » Mon Jun 17, 2013 5:43 pm

SAHM_TAN wrote:Is it 100 degrees?


DS2 says 80 degrees..

@ Sensei-Michael, what is your answer?

I am not at all surprised to see such questions in Primary School Mathematics.. Are you?

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Re: How Can This Question Appear in Primary School Mathemati

Postby icy_mama » Mon Jun 17, 2013 6:23 pm

dd says it's 80 too. she's p6.

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Re: How Can This Question Appear in Primary School Mathemati

Postby senseimichael » Mon Jun 17, 2013 9:14 pm

I have edited the original post, firefly, thanks for pointing it out.

I am not sure exactly which level, but this is an example of how we adults tend to think from our POV, when younger children would simply solve it according to their thinking. Amazing.

Yes, the answer is 80 degrees.

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Re: How Can This Question Appear in Primary School Mathemati

Postby SAHM_TAN » Mon Jun 17, 2013 9:18 pm

How to get 80 degrees? Thanks.

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