A question was asked about holding your child’s attention during lessons.
I have found that he is most attentive in the morning. As the day goes on, he becomes less interested. I have a room setup just for learning. This is separate from all of his toys.  When he comes in that room, I know he wants to do something with me. But I also ask him throughout the day if he wants to learn or “play with daddy”. He associates learning with playing with me. I also do not give ultimatums or impose negative sanctions if he does not want to finish his lessons. For instance, if he wants to go to the park, I will never say, “finish this lesson then we will go to the park”. I do not want to associate learning with me as a chore but rather something fun. Your child is constantly changing. As he gets older, he may become more attentive or less attentive. Some days it is very hard to keep his attention. When he goes through these stages, it is best to do something completely new or change the way you are trying to teach him something. There are many ways to teach multiplication. You can line up objects, use flash cards, play songs or write it on the sidewalk with chalk. A lot of people associate learning with their experience with the school system. Your 3 year old is not going to sit in a chair and listen to you lecture for an hour. Just make it fun and keep it interesting. Keep it chaotic. In general, you only have short windows of time where he will be 100% focused on you.