Users create one or two addition and/or subtraction expressions using blocks (single and a column of ten). Users can see the expressions evaluated and a representation of each expression on a number line. The use of negative numbers and blocks can be turned on or off. NOTE: image errors in the "Total" boxes in this tool were occurring due to a known bug with GeoGebra; tool total images are shut off in this version. An updated version with total images will be posted at the same URL when it is ready.

Download this tool. <Open this tool with increased GeoGebra functionality.>