Estimate to the nearest choice

When the five choices are far apart, a rough calculation picks the right one. Round aggressively, get an approximate answer, and choose the nearest. This is a decision about the answer choices, not a shortcut in the arithmetic.

Your progress

Not started

2Not started
0Familiar
0Proficient
0Mastered

Saved in this browser only. No account, nothing sent anywhere.

Work through it

LearnWhat it is, how to spot it, a worked example, and where it goes wrong.
Practice — 3-point ladder1 problem. Three in a row finishes it.0/3 in a row · 0/1 solved
Practice — 4-point ladder1 problem. Three in a row finishes it.0/3 in a row · 0/1 solved
Practice — 5-point ladderNo problems written at this tier yet.Nothing written at this tier yet
Skill quizFinish every ladder that has problems first.Finish the ladders above first

Before and after

Needs first

CFT-05Eliminate impossible choices by bounding NUM-12Estimation and order of magnitude

Opens up

Nothing yet. No other skill in the Atlas lists this one as a prerequisite.

In official papers

No indexed official paper question has been tagged with CFT-06 yet. The index grows one paper at a time, and it records only question numbers, point values and our own skill tags — never the problems themselves.

See the papers indexed so far

Loading…