CAHSEE Math 1.2 Mathematical Reasoning

CAHSEE Math Mathematical Reasoning: Drill Set 1, Problem 2. Which of the following should be the most appropriate first step in solving the equation?

AlgebraWord Problems
CAHSEE MathMathematical Reasoning
LanguageEnglish Language
Mathematical ReasoningAnalyzing problems
Mathematics and Statistics AssessmentWord Problems and Applications

Transcript

00:24

There are lots of ways to approach it,

00:25

so it’s tough to have a hard-wired MOST appropriate way to tackle.

00:29

However, in this case, the BEST answer is probably getting rid of the fraction…

00:33

…because they are just a pain to deal with, especially if we don’t have a laptop at our disposal.

00:39

So intuitively multiplying both sides by 9

00:42

would make sense as a first step and it’d simplify the world a whole lot.

00:46

But let’s check out the other potential answers here.

00:49

A – divide both sides by 2 – eih – that doesn’t really help us all that much.

00:54

B – adding 17 to both sides really just confuses the issue – we can’t just add

00:59

17 to the left side and make the negative 17 go away.

01:02

That was kind of a curveball trick question. Thank you very much, test makers.

01:06

And C – DIVIDING by 9 doesn’t help us at all – we’re then stuck with denominators

01:11

of 81 on the left and a seven-ninths on the right. Blech. Ugly.

01:16

So… ok, D it is.

01:17

As in… “Denominators are pains in the butt.”