Counting in Tens with Explain Everything

We've been learning to count in tens in class, and will often do it as a whole class warm up.  I've been concerned that some learners are possibly saying "teen" instead of "ty" when skip counting.

Today I asked learners that were not working with me to take a photo of our 100s board in Explain Everything and skip count in tens.  We uploaded their work to their Google Drive and tonight I was able to watch all the movies quickly from my laptop and hear immediately which learners needed assistance.

Once again I love the power of the voice, and hearing what the learners are doing.  I plan to use this activity again tomorrow and have learners count to 20, again recording their voice.  This will enable me to determine if there are any learners that are mixing the "teen" and "ty" as they count through their teen numbers.