Integer Cruncher

Students use counters to model the addition or subtraction of two integers. For example -2 + +5 = +3 or -5 - +1 = -6.

Teacher notes

• 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.

Learning objects

	Integer cruncher: addition Students add positive and negative integers.
	Integer cruncher: subtraction Students subtract positive and negative integers.
	Integer cruncher: addition and subtraction This is an aggregated learning object combining the two other learning objects.