CAHSEE Math Mathematical Reasoning: Drill Set 1, Problem 2. Which of the following should be the most appropriate first step in solving the equation?
|CAHSEE Math||Mathematical Reasoning|
|Mathematical Reasoning||Analyzing problems|
|Mathematics and Statistics Assessment||Word Problems and Applications|
There are lots of ways to approach it,
so it’s tough to have a hard-wired MOST appropriate way to tackle.
However, in this case, the BEST answer is probably getting rid of the fraction…
…because they are just a pain to deal with, especially if we don’t have a laptop at our disposal.
So intuitively multiplying both sides by 9
would make sense as a first step and it’d simplify the world a whole lot.
But let’s check out the other potential answers here.
A – divide both sides by 2 – eih – that doesn’t really help us all that much.
B – adding 17 to both sides really just confuses the issue – we can’t just add
17 to the left side and make the negative 17 go away.
That was kind of a curveball trick question. Thank you very much, test makers.
And C – DIVIDING by 9 doesn’t help us at all – we’re then stuck with denominators
of 81 on the left and a seven-ninths on the right. Blech. Ugly.
So… ok, D it is.
As in… “Denominators are pains in the butt.”