Understanding Subtraction of Integers and Other Rational Numbers

Subtraction is all about opposites and the fifth lesson in a series of 25 introduces the concept of subtracting integers. Pupils connect subtracting with discarding a card in the integer game. They develop the rule for subtracting positive and negative integers and transfer the concepts to all rational numbers.

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CCSS: Designed
Additional Tags
Instructional Ideas
  • Play the integer game with the rule of subtracting the numbers instead of adding them
  • Use two-sided counters to demonstrate adding the opposite
Classroom Considerations
  • It is helpful if pupils are fluent with adding integers
Pros
  • Ties subtraction to an integer game that is familiar to the class
  • Includes suggested learning strategies to incorporate in the lesson
Cons
  • None
Common Core