Students use counters to model the addition or subtraction of two integers. For example -2 + +5 = +3 or -5 - +1 = -6.
- Introduces the general concepts of integer calculations.
- Students place positive and negative counters in a workspace to match pairs of integers and work out solutions. An introduction explaining the use of the workspace is provided.
- Represents the calculation on a number line once the answer has been given.
- Once six equations have been correctly solved, an on screen summary of the solved equations is presented.
Integer cruncher: addition
Integer cruncher: subtraction
Integer cruncher: addition and subtraction