This activity uses number discs to model numbers in arithmetic operations of addition and subtraction.
Students are expected to the discs to represent given expressions in the drop down list displayed.
Read about how zero pairs are used in negative number artihmetic in this article at
https://www.researchgate.net/publication/333816409_Addition_and_subtraction_of_negative_numbers
(Version 1, 30 Jan 2022, adapted from Algebra and Number Discs manipulation at
https://www.geogebra.org/m/psxnuhbt
This tool will continue to be developed, and users are welcome to feedback to author for improving the design or to additional features and use cases.
