A small lesson.
A useful new skill.
A few minutes, a worked example, and a question to try. No sign-up. No download. Start wherever you're curious.
Mental math · 2 minutes
02Multiply by 11 in your head
See the shortcut—and what changes when you need to carry.
ISEE math · 3 minutes
03Compare quantities without guessing
Use two allowed values to check whether the answer stays the same.
GMAT practice · 3 minutes
04Do you have enough information?
Learn why Data Sufficiency is about certainty, not doing every calculation.
Beginner French · 2 minutes
Say “not” with ne … pas
Wrap two small words around a verb to make a negative sentence.
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