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Posts tagged with mistakes

A common mistake in Algebra

August23

The following graphic from Wikihow shows a common mistake made by Jnr Math students: For more steps on understanding basic Algebra, click here.

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Learn Math by making mistakes!

April6

It has been a long couple of weeks setting exams, working out solutions and then marking. Of course, given the pressure that we are often under, mistakes do happen – both in the papers and solutions, and in the students’ answers. However, you do need to realise that making these mistakes is a real positive, […]

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10 Biggest Math Mistakes in History

December22

Check out these 10 big math errors from the pages of history. Many are so simple that students are trained to avoid them in class!  

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NCEA Level 2 Algebra Problem. Using the information given, the shaded area = 9, that is:
y(y-8) = 9 –> y.y – 8y – 9 =0
–> (y-9)(y+1) = 0, therefore y = 9 (can’t have a distance of – 1 for the other solution for y)
Using the top and bottom of the rectangle,
x = (y-8)(y+2) = (9-8)(9+2) = 11
but, the left side = (x-4) = 11-4 = 7, but rhs = y+? = 9+?, which is greater than the value of the opp. side??
[I think that the left had side was a mistake and should have read (x+4)?]

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