Khan Academy
Khan Academy: 2 Digit Place Value Challenge
Practice breaking numbers apart into tens and ones.
K-5 Math Teaching Resources
K 5 Math Teaching Resources: Division Strategy: Partition the Dividend [Pdf]
Break numbers apart as a strategy to divide.
University of Colorado
University of Colorado: Ph Et Interactive Simulations: Make a Ten
An interactive simulation that teaches about place value, addition, and subtraction by adding, breaking apart, and combining numbers by making tens and focusing on place value. This simulation can either be downloaded or played online...
Khan Academy
Khan Academy: Adding 53+17 by Making a Group of 10
Sal adds 53+17 by breaking apart the numbers and making a group of 10. [3:35]