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MP AMC Book 1

Assessing Math Concepts • Book 8
Grouping Tens

by Kathy Richardson

Topic: Numbers as Tens and Ones

Goal: To determine if the child can tell "how many" in a quantity if the number of tens and ones is known, and to determine if the child can add ten and take away ten without counting. To also determine if the child knows that the total number does not change when counted in a different way, what it means to count by 2's or 5's, and how well the child can do this.

Critical Learning Phases:

  • Organizes quantities into tens and ones
  • Instantly knows total quantity when the number of tens and ones is known
  • Knows 10 more for any two-digit number
  • Knows 10 less for any two-digit number