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2. Virtual manipulatives for mathematics - Wikipedia

   en.wikipedia.org/wiki/Virtual_manipulatives_for...

   Virtual manipulatives for mathematics are digital representations of mathematics manipulatives based on the physical manipulatives used in classrooms. [1] They are generally used to introduce mathematical concepts using visuals and are used for teaching students new topics that may be more difficult to explain in other ways.

3. Mathletics (educational software) - Wikipedia

   en.wikipedia.org/wiki/Mathletics_(educational...

   Mathletics is an online educational website which launched in 2005. [1] The website operates through a subscription model, offering access at an individual and school level. Online users, known as 'Mathletes', have access to math quizzes and challenges, and can participate in a real-time networked competition known as 'Live Mathletics'. [2]

4. Virtual currency - Wikipedia

   en.wikipedia.org/wiki/Virtual_currency

   A virtual currency that can be bought with and sold back is called a convertible currency. A virtual currency can be decentralized, for example bitcoin, a cryptocurrency. Transacting or even holding convertible virtual currency may be illegal in particular jurisdictions and to particular national citizens at particular times and the transactor ...

5. Digital currency - Wikipedia

   en.wikipedia.org/wiki/Digital_currency

   Digital currency can be denominated to a sovereign currency and issued by the issuer responsible to redeem digital money for cash. In that case, digital currency represents electronic money (e-money). Digital currency denominated in its own units of value or with decentralized or automatic issuance will be considered as a virtual currency.

6. Bitcoin - Wikipedia

   en.wikipedia.org/wiki/Bitcoin

   Bitcoin (abbreviation: BTC; sign: ₿) is the first decentralized cryptocurrency. Nodes in the peer-to-peer bitcoin network verify transactions through cryptography and record them in a public distributed ledger, called a blockchain, without central oversight.

7. Verbal arithmetic - Wikipedia

   en.wikipedia.org/wiki/Verbal_arithmetic

   Verbal arithmetic, also known as alphametics, cryptarithmetic, cryptarithm or word addition, is a type of mathematical game consisting of a mathematical equation among unknown numbers, whose digits are represented by letters of the alphabet.