My plan worked! He was totally into the puzzles and noticed they were numbers without me pointing it out. He loved counting the dinosaurs and when I asked him to put them in order he was more than willing. We practiced counting and then looked for the numbers.
I only had him do 0-3 but he wanted to do more so we went through all the digits. He really enjoyed this and didn't even complain! Hopefully this will be an activity that we can do over and over.