Here's a nice post on using place value cards to help students understand decomposing numbers and expanded form. Includes a link to a set of place value cards. Could change colors to go with Math-U-See.
Introducing Number Bonds with Hands-On Experiences
A great way to link Numbers and Math on Valentines Day! This set contains 7 Worksheets - Listed below Fill in the gaps counting to 100 Fill in the gaps counting back from 100 Hearts - Write the number between Cut and Paste Hearts - Write the number