Brush up your maths. One real problem a day.

For adults who want their maths back — from mental arithmetic to a little algebra and geometry over six weeks, drawn from Kiselev, Rachinsky and the Russian classics. Every morning at 06:00 from Monday to Friday, plus a harder challenge on Saturday, with the worked explanation the moment you answer.

  1. 1. We send a problem. Plain prose, no notation your inbox can't show.
  2. 2. You solve it. Type your answer on one page. No account, no password, no grade levels.
  3. 3. You see the explanation. Right or wrong, you learn why.

Sample problem · Kiselev, Arithmetic

A merchant bought cloth at 3 roubles a yard and sold it at 4 roubles a yard, making 36 roubles. How many yards did he buy?

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