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  2. Math Blaster for 1st Grade - Wikipedia

    en.wikipedia.org/wiki/Math_Blaster_for_1st_Grade

    Math Blaster for 1st Grade is a 1999 educational video game in a line of educational products originally created by Davidson & Associates and continued by Knowledge Adventure. The game was re-released in 2000 as Math Blaster Mission 2 .

  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. [1] [2]

  4. JumpStart 1st Grade - Wikipedia

    en.wikipedia.org/wiki/JumpStart_1st_Grade

    JumpStart 1st Grade (known as Jump Ahead Year 1 in the United Kingdom) is a personal computer game created by Knowledge Adventure in 1995 intended to teach a first grade curriculum. It was reissued in 1999 with new box art, was updated significantly in 2000, and was replaced with JumpStart Advanced 1st Grade in 2002, which was later replaced ...

  5. Addition - Wikipedia

    en.wikipedia.org/wiki/Addition

    Subtraction is itself a sort of inverse to addition, in that adding x and subtracting x are inverse functions. Given a set with an addition operation, one cannot always define a corresponding subtraction operation on that set; the set of natural numbers is a simple example.

  6. Subtraction - Wikipedia

    en.wikipedia.org/wiki/Subtraction

    In a sense, subtraction is the inverse of addition. That is, c = a − b if and only if c + b = a. In words: the difference of two numbers is the number that gives the first one when added to the second one. Subtraction follows several important patterns. It is anticommutative, meaning that changing the order changes the sign of the answer.

  7. Foreground detection - Wikipedia

    en.wikipedia.org/wiki/Foreground_detection

    N would depend on the video speed (number of images per second in the video) and the amount of movement in the video. [4] After calculating the background B(x,y,t) we can then subtract it from the image V(x,y,t) at time t = t and threshold it. Thus the foreground is:

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