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  2. Casting out nines - Wikipedia

    en.wikipedia.org/wiki/Casting_out_nines

    Since we are adding 1 to the tens digit and subtracting one from the units digit, the sum of the digits should remain the same. For example, 9 + 2 = 11 with 1 + 1 = 2. When adding 9 to itself, we would thus expect the sum of the digits to be 9 as follows: 9 + 9 = 18, (1 + 8 = 9) and 9 + 9 + 9 = 27, (2 + 7 = 9).

  3. Nine dots puzzle - Wikipedia

    en.wikipedia.org/wiki/Nine_dots_puzzle

    The "nine dots" puzzle. The puzzle asks to link all nine dots using four straight lines or fewer, without lifting the pen. The nine dots puzzle is a mathematical puzzle whose task is to connect nine squarely arranged points with a pen by four (or fewer) straight lines without lifting the pen or retracing any lines.

  4. Number Sense (UIL) - Wikipedia

    en.wikipedia.org/wiki/Number_Sense_(UIL)

    Students in Grade 4 through Grade 12 are eligible to enter this event. For competition purposes, separate divisions are held for Grades 4-6, Grades 7-8, and Grades 9-12, with separate subjects covered on each test as follows: The test for Grades 4-6 covers basic arithmetic and mathematical functions.

  5. Mathematical Kangaroo - Wikipedia

    en.wikipedia.org/wiki/Mathematical_Kangaroo

    All of them were impressed by the increasing number of participants in the Kangaroo challenge in France: 120 000 in 1991, 300 000 in 1992, half a million in 1993. In seven countries – Belarus, Hungary, The Netherlands, Poland, Romania, Russia, and Spain – teams of teachers decided to also organize the contest in 1994.

  6. Exercise (mathematics) - Wikipedia

    en.wikipedia.org/wiki/Exercise_(mathematics)

    At the Russian School of Mathematics, students begin multi-step problems as early as the first grade, learning to build on previous results to progress towards the solution. In the 1960s, collections of mathematical exercises were translated from Russian and published by W. H. Freeman and Company : The USSR Olympiad Problem Book (1962), [ 8 ...

  7. List of mathematics competitions - Wikipedia

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

    Math League (grades 4–12) Math-O-Vision (grades 912) Math Prize for Girls; MathWorks Math Modeling Challenge; Mu Alpha Theta; Pi Math Contest (for elementary, middle and high school students) United States of America Mathematical Olympiad (USAMO) United States of America Mathematical Talent Search (USAMTS) Rocket City Math League (pre ...

  8. American Mathematics Competitions - Wikipedia

    en.wikipedia.org/wiki/American_Mathematics...

    The 2007 competitions were the first with only 1.5 points awarded for a blank, to discourage students from leaving a large number of questions blank in order to assure qualification for the AIME. For example, prior to this change, on the AMC 12, a student could advance with only 11 correct answers, presuming the remaining questions were left blank.

  9. Investigations in Numbers, Data, and Space - Wikipedia

    en.wikipedia.org/wiki/Investigations_in_Numbers...

    The total package for Grade 5 is listed at $1,388.42, and within that total the cost of the just mentioned student materials, for a class of 32, is $817.00 [11] Many mathematics classrooms where active learning occurs already own many of these materials, so it is not necessary to purchase all of these items from the publisher.

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