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2. Multiplication and repeated addition - Wikipedia

   en.wikipedia.org/wiki/Multiplication_and...

   From the mathematical point of view, multiplication as repeated addition can be extended into fractions. For example, literally calls for “one and three-fourths of the five-sixths.”. This is later significant because students are taught that, in word problems, the word “of” usually indicates a multiplication.

3. Elementary arithmetic - Wikipedia

   en.wikipedia.org/wiki/Elementary_arithmetic

   Elementary arithmetic. The symbols for elementary-level math operations. From top-left going clockwise: addition, division, multiplication, and subtraction. Elementary arithmetic is a branch of mathematics involving addition, subtraction, multiplication, and division. Due to its low level of abstraction, broad range of application, and position ...

4. List of Cyberchase episodes - Wikipedia

   en.wikipedia.org/wiki/List_of_Cyberchase_episodes

   episodes. Cyberchase is an animated mathematics series that currently airs on PBS Kids. The show revolves around three Earth children (Jackie, Matt, and Inez) who use mathematics and problem-solving skills to save Cyberspace from a villain known as The Hacker. The three are transported into Cyberspace by Motherboard, the ruler of this virtual ...

5. Wide Open School organizes free educational resources to help ...

   techcrunch.com/2020/03/31/wide-open-school...

   In addition, Wide Open School offers a guide to getting started with learning at home, a collection of virtual field trips, a collection with resources for art and music and one with resources for ...

6. National Geographic launches a homeschool hub for parents and ...

   techcrunch.com/2020/04/06/natio

   The content on the site, aimed at K-12 students, is organized by grade and tagged as either “read,” “watch” or “play,” depending on whether it’s an article, video or activity.

7. List of prime numbers - Wikipedia

   en.wikipedia.org/wiki/List_of_prime_numbers

   Weakly prime numbers. Primes that having any one of their (base 10) digits changed to any other value will always result in a composite number. 294001, 505447, 584141, 604171, 971767, 1062599, 1282529, 1524181, 2017963, 2474431, 2690201, 3085553, 3326489, 4393139 ( OEIS : A050249 )