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2. Mathletics (educational software) - Wikipedia

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

   The option to participate in real-time, live networked mathematic competitions known as 'Live Mathletics' are offered to users on the Mathletics Website. The primary objective to win is for users to complete as many addition, subtraction and multiplication problems as possible before the one-minute timer ends. Users must select which difficulty ...

3. Elementary arithmetic - Wikipedia

   en.wikipedia.org/wiki/Elementary_arithmetic

   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 as the foundation of all mathematics, elementary arithmetic is generally the first branch of mathematics taught in schools.

4. Brain Age: Train Your Brain in Minutes a Day! - Wikipedia

   en.wikipedia.org/wiki/Brain_Age:_Train_Your_Brain...

   Calculations × 20 presents the player with 20 simple calculation equations that includes addition, subtraction, and multiplication. On the top screen are the problems which scroll up as answered whether right or wrong, while the touch screen is used to write out the answer. This test is also available in the training section.

5. Order of operations - Wikipedia

   en.wikipedia.org/wiki/Order_of_operations

   If each subtraction is replaced with addition of the opposite (additive inverse), then the associative and commutative laws of addition allow terms to be added in any order. The radical symbol ⁠ t {\displaystyle {\sqrt {\vphantom {t}}}} ⁠ is traditionally extended by a bar (called vinculum ) over the radicand (this avoids the need for ...

6. Addition - Wikipedia

   en.wikipedia.org/wiki/Addition

   Addition (usually signified by the plus symbol, +) is one of the four basic operations of arithmetic, the other three being subtraction, multiplication, and division. [2] The addition of two whole numbers results in the total amount or sum of those values combined. The example in the adjacent image shows two columns of three apples and two ...

7. Arithmetic - Wikipedia

   en.wikipedia.org/wiki/Arithmetic

   Counting is a type of repeated addition in which the number 1 is continuously added. [46] Subtraction is the inverse of addition. In it, one number, known as the subtrahend, is taken away from another, known as the minuend. The result of this operation is called the difference. The symbol of subtraction is . [47]