Integer cruncher: addition and subtraction

http://tlf.dlr.det.nsw.edu.au/learningobjects/Content/L585/object/index.html

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Publisher, Le@rning Federation

Use counters to model the addition and subtraction of integers. For example, (-2)+(+5)=(+3) or (-2)?(-5)=(+3). See the calculations represented in an alternate form on a number line. This learning object is one in a series of four objects.

6 November 2012 Edit: 18 June 2019

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