DD3.5 declared she wants to go to high school. I jokingly told her she needs to learn to write and be ready for at least pre-algebra. She wanted to know what that was so I showed her a couple of very easy questions then...she solved them in her head.

The only exposure she had to equations is Dragonbox. She whipped through it including the bonus section, which is mostly numbers and letters and she was picking up concepts that went beyond what the app covers but I had no idea she retained them and could apply them a month later. I knew she liked math. I knew she was ready for 2nd grade math when she was 2 but still, I am surprised.

She has a lot of gaps. We have done no formal math lessons and she doesn't have her math facts down. I think her number placement beyond 1000s is a bit shaky. I don't know where to go from here but my guess is that we'll stick to no formal instructions until she is 6.