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An artificially produced word problem is a genre of exercise intended to keep mathematics relevant. Stephen Leacock described this type: [1] The student of arithmetic who has mastered the first four rules of his art and successfully striven with sums and fractions finds himself confronted by an unbroken expanse of questions known as problems ...
Free-of-charge version available Spaced repetition Number of sides Supports Unicode Supports image Supports audio Other formats Printable Import-export Supports sync Plugin support Working offline Anki: AGPLv3 (personal computer, Android), proprietary Yes (except iOS) Yes Multiple Yes Yes Yes Video, LaTeX, HTML: Plugin [1] Yes Yes Yes Yes
Subtraction of natural numbers is not closed: the difference is not a natural number unless the minuend is greater than or equal to the subtrahend. For example, 26 cannot be subtracted from 11 to give a natural number. Such a case uses one of two approaches: Conclude that 26 cannot be subtracted from 11; subtraction becomes a partial function.
Interactive subtraction game: Players take turns removing 1, 2 or 3 objects from an initial pool of 21 objects. The player taking the last object wins. In another game which is commonly known as nim (but is better called the subtraction game ), an upper bound is imposed on the number of objects that can be removed in a turn.
The subtraction operator: a binary operator to indicate the operation of subtraction, as in 5 − 3 = 2. Subtraction is the inverse of addition. [1] The function whose value for any real or complex argument is the additive inverse of that argument. For example, if x = 3, then −x = −3, but if x = −3, then −x = +3. Similarly, −(−x) = x.
One of these words mentioned will appear on screen, in a random color which may not match the color denoted by the word. The player is instructed to say the color of the word, rather than the word itself (e.g., if the word Yellow appears in blue letters, the correct answer is "blue" according to the Stroop effect for details).