Mathematical Reasoning Drill 3 Problem 3. When adding these fractions without finding the lowest common denominator, which of the following is the best estimate of the exact sum?
|CAHSEE Math||Mathematical Reasoning|
|Mathematical Reasoning||Estimating unknown quantities|
Basically, we just have to look at each of
the fractions and come up with a rough estimate for how close they are to 1/9, 1/3, ½ or 2/3.
3.5 sevenths would be a half, so 3 sevenths is slightly under.
4.5 ninths would be a half, so 5 ninths is slightly over.
Anyway. You get the idea.
The answer is a bunch of halves… or C.