Upvote for the numberblocks. My non-English speaking son found it on youtube, and learned a lot more than expected. At 5, I had to explain square roots to him

Upvote for the numberblocks. My non-English speaking son found it on youtube, and learned a lot more than expected. At 5, I had to explain square roots to him, my wife joking he knew more mats than she did now. He ran around the house for weeks, screaming: The four fours! Oh yeah! So he presumably learnt some English along the way.