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subtraction |
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subtraction, fundamental operation of arithmetic; the inverse of addition. If a and b are real numbers (see number number, entity describing the magnitude or position of a mathematical object or extensions of these concepts.
The Natural NumbersCardinal numbers describe the size of a collection of objects; two such collections have the same (cardinal) number of ..... Click the link for more information. ), then the number a−b is that number (called the difference) which when added to b (the subtractor) equals a (the subtrahend). In terms of addition the symbol −b is called the additive inverse of b with the property that the sum of a number and its inverse equals 0, or b+(−b)=0. It follows that −(−b)=b. The subtraction of b from a is the same as the addition of a and the inverse of b, or a−b=a+(−b); e.g., when a=10 and b=5, then 10−5=10+(−5). How to thank TFD for its existence? Tell a friend about us, add a link to this page, add the site to iGoogle, or visit webmaster's page for free fun content. |
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Effect of operation on Not consistent--some understanding for number addition and subtraction (where minuend changes). Four types of math facts were assessed: addition problems with sums less than 10, addition problems with sums between 10 and 18, subtraction problems with minuends less than 10, and subtraction problems with minuends between 10 and 18. |
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