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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")
The first mention of the number line used for operation purposes is found in John Wallis's Treatise of Algebra (1685). [2] [page needed] In his treatise, Wallis describes addition and subtraction on a number line in terms of moving forward and backward, under the metaphor of a person walking.
A similar procedure is used for subtraction. If the two numbers do not have the same denominator then they must be transformed to find a common denominator. This can be achieved by scaling the first number with the denominator of the second number while scaling the second number with the denominator of the first number.
A geometric discussion of addition and subtraction of real numbers using the number line, ideally including pictures; A basic discussion of how left and right correspond to less than and greater than, as well as how distance corresponds to the absolute value of the difference; A short discussion of how the rational numbers fit onto the number ...
Subtraction; Multiplication; Division; Number patterns - instead of featuring traditional equations, "number patterns" provides the user with a series of numbers with one of the numbers missing. The user must identify the pattern to find the missing number (for example, if the problem presented is "5, 10, 15, _, 25", then the missing number is 20).
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