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2. Mental abacus - Wikipedia

   en.wikipedia.org/wiki/Mental_abacus

   The abacus can be used routinely to perform addition, subtraction, multiplication, and division; it can also be used to extract square and cube [4] roots.

3. Mental calculation - Wikipedia

   en.wikipedia.org/wiki/Mental_calculation

   Since 9 = 10 − 1, to multiply a number by nine, multiply it by 10 and then subtract the original number from the result. For example, 9 × 27 = 270 − 27 = 243. This method can be adjusted to multiply by eight instead of nine, by doubling the number being subtracted; 8 × 27 = 270 − (2×27) = 270 − 54 = 216.

4. List of educational video games - Wikipedia

   en.wikipedia.org/.../List_of_educational_video_games

   This is a list of notable educational video games. There is some overlap between educational games and interactive CD-ROMs and other programs (based on player agency), and between educational games and related genres like simulations and interactive storybooks (based on how much gameplay is devoted to education). This list aims to list games ...

5. Cool Math Games - Wikipedia

   en.wikipedia.org/wiki/Cool_Math_Games

   Cool Math Games (branded as Coolmath Games) [a] is an online web portal that hosts HTML and Flash web browser games targeted at children and young adults. Cool Math Games is operated by Coolmath LLC and first went online in 1997 with the slogan: "Where logic & thinking meets fun & games.".

6. Are You Smarter than a 5th Grader? (American game show)

   en.wikipedia.org/wiki/Are_You_Smarter_than_a_5th...

   Once the first part of the game is completed, the contestant faces the fifth grade. Five subjects are shown to the contestant, each with one fifth grade-level question. The contestant is given 60 seconds to answer all five questions. As in the first part of the game, the contestant must press the button on his or her desk to lock in an answer.

7. List of mathematics competitions - Wikipedia

   en.wikipedia.org/wiki/List_of_mathematics...

   Rocket City Math League (RCML) — Competition run by students at Virgil I. Grissom High School with levels ranging from Explorer (Pre-Algebra) to Discovery (Comprehensive) Romanian Master of Mathematics and Sciences — Olympiad for the selection of the top 20 countries in the last IMO. Tournament of the Towns — worldwide competition.