Place Value
Break Apart to Make A Ten
Homework Example 2 (including skip counting)
Number Line
Expanded Form
Homework Example (compare Addition strategies: Make a Ten and Expanded Form)
Homework Example 2 (compare Subtraction strategies: Add it Up and Expanded Form)
Part-Part-Whole
Practice Balancing Equations with this website - click on Number Balance KS2
video (start at 5 min mark)
video 2 (need Learnzillion account - it's free!)
video 3 (skip counting on the numberline)