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Shake off those Naplan Blues!

May4

By now you may be getting somewhat stressed about the upcoming Naplan tests in Maths. No need to! By now you have completed several revision sheets and also checked out the online materials at this Naplan site? Great! The goal here is to be familiar with each of the “calculator” and “non calculator” Naplan Maths tests. Look at the key words in each question, such as “perimeter”, “mass”,  “ratios”, “patterns”, “area”, “percentage”. Do a quick search for these in your textbook and review the example questions. The non-calculator paper often uses estimates – e.g. “2.89 x 3.057” best equals? Round these numbers to “2.9 x 3” which equals 8.7 as an approximate answer (you are usually given four to choose from).

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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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