Idéllo Elo’s Missions - Go to homepage.

Oops! You must be signed in with your IDÉLLO account to access the Mission.

Sign in

Adding and Subtracting up to 100,000

  • Grade 5
  • Mathematics
  • Numbers


In this mission, students expand their knowledge of addition and subtraction operations. Students choose an algorithm or strategy to solve problems.

Learning goals

  • I solve addition and subtraction problems up to 100,000 using an effective strategy.
  • I demonstrate my reasoning and my method.


  • addition
  • substraction
  • problem-solving
  • numbers
  • common algorithm
  • position values
  • decomposition
  • sum
  • differences
  • Franco-Ontarian festival