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My students in 4th Grade absolutely loved working on this problem! We did this in class yesterday (in small groups) and each group presented their solution (and explained how they arrived at their solution) using Educreations on their iPad. Here are the links to their videos:

Philip, Eric & Seungji's video: https://www.educreations.com/lesson/view/math-card-challenge/24792192/?…

Konu, Anjani & Alice's video: https://www.educreations.com/lesson/view/fifteen-cards/24792351/?s=doRq…

Yoonseo, Christie & Brandon's video: https://www.educreations.com/lesson/view/math/24792201/?s=x2hcfn&ref=ap…

If you would like a written explanation instead, the kids would be more than happy to write up their mathematical thinking for you.