I am completely in LOVE with Deanna Jump and DeeDee Wills Guiding Firsties Math Workshop activities.  My school uses the Math Expressions curriculum and I have been able to integrate this workshop model into my math block.  We used this activity for partner work as we were learning the break aparts for 10.  I used some Halloween erasers from the Target Dollar Spot (Holla!) My littles loved this and had so much fun.  I am hoping I am able to integrate their other units as the year goes on, fingers crossed.