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2. Ninety-nine (addition card game) - Wikipedia

   en.wikipedia.org/wiki/Ninety-nine_(addition_card...

   Most underrated: Jack and Queen. If someone plays a 10 (minus 10) against a 99, these will push it right back to 99; Overrated: King only buys you one extra turn, hardly better than a 9 at end-of-game play. If you are forced to play a high-value card, prefer to throw out a King in favor of keeping a 4 or 10 in reserve. Most valuable: 4.

3. Plus and minus signs - Wikipedia

   en.wikipedia.org/wiki/Plus_and_minus_signs

   The plus sign (+) and the minus sign (−) are mathematical symbols used to denote positive and negative functions, respectively. In addition, the symbol + represents the operation of addition , which results in a sum , while the symbol − represents subtraction , resulting in a difference . [ 1 ]

4. File:Operators (plus minus times divide).svg - Wikipedia

   en.wikipedia.org/wiki/File:Operators_(plus_minus...

   You are free: to share – to copy, distribute and transmit the work; to remix – to adapt the work; Under the following conditions: attribution – You must give appropriate credit, provide a link to the license, and indicate if changes were made.

5. Power of 10 - Wikipedia

   en.wikipedia.org/wiki/Power_of_10

   Visualisation of powers of 10 from one to 1 trillion. In mathematics, a power of 10 is any of the integer powers of the number ten; in other words, ten multiplied by itself a certain number of times (when the power is a positive integer). By definition, the number one is a power (the zeroth power) of ten. The first few non-negative powers of ...

6. Subtraction - Wikipedia

   en.wikipedia.org/wiki/Subtraction

   Subtraction of numbers 0–10. Line labels = minuend. X axis = subtrahend. Y axis = difference. Subtraction is usually written using the minus sign "−" between the terms; that is, in infix notation. The result is expressed with an equals sign. For example, = (pronounced as "two minus one equals one")

7. Order of operations - Wikipedia

   en.wikipedia.org/wiki/Order_of_operations

   The order of operations, that is, the order in which the operations in an expression are usually performed, results from a convention adopted throughout mathematics, science, technology and many computer programming languages.