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Posts tagged with math errors

Common Maths Mistakes – Summary

November14

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 […]

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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10 x 9 x 8 + (7 + 6) x 5 x 4 x (3 + 2) x 1 = 2020

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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