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Posts tagged with common mistakes

Common Maths Mistakes – Summary


It would be to simplistic to have a few summary mistakes that are commonly made by Math students, but I will try! 1. Don’t know my times tables (or have them handy). Yes, I know that I have calculators on my devices, but my brain is a quicker one and I need to use it […]

A common mistake in Algebra


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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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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