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Assessing Math Concepts • Book 9
Two-Digit Addition & Subtraction

by Kathy Richardson

Topic: Combining and Separating Tens and Ones

Goal: To determine if a child can add and subtract from two-digit numbers by mentally breaking numbers apart and reorganizing them into tens and leftovers, and to determine how the child solves problems presented symbolically.

Critical Learning Phases:

  • Tells how many needed to make the next 10
  • Combines numbers by reorganizing them into tens and leftovers when necessary
  • Breaks apart tens when necessary and reorganizes what is left into tens and leftovers