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subtraction

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Subtraction practice
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sub⋅trac⋅tion

  [suhb-trak-shuhn]
Use subtraction in a Sentence
–noun
1. an act or instance of subtracting.
2. Mathematics. the operation or process of finding the difference between two numbers or quantities, denoted by a minus sign (−).
Origin:
1350–1400; ME < LL subtractiōn- (s. of subtractiō) a withdrawing, equiv. to subtract(us) (see subtract ) + -iōn- -ion
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2009.
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Subtraction practice
Subtract whole numbers, fractions, decimals, mixed numbers, MUCH more!
www.ixl.com/math
sub·trac·tion   (səb-trāk'shən)   
n.  

  1. The act or process of subtracting; deduction.

  2. Mathematics The arithmetic operation of finding the difference between two quantities or numbers.

The American Heritage® Dictionary of the English Language, Fourth Edition
Copyright © 2009 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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Word Origin & History

subtraction 
c.1400, "withdrawal, removal," from L.L. subtractionem (nom. subtractio) "a drawing back, taking away," from L. subtractus, pp. of subtrahere "take away, draw off," from sub "from under" + trahere "to pull, draw" (see tract (1)). The mathematical sense is attested from c.1425. The verb subtract is first recorded c.1540.
"Þou most know þat subtraccion is drawynge of one nowmber oute of anoþer nomber." ["The Crafte of Nombrynge," c.1425]
Online Etymology Dictionary, © 2001 Douglas Harper
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