Love this. I push my kids like this. My son if I pushed him enough could learn to solve this and he is 4 but it would take me a couple months to get him there. He can add and do some multiplication and subtraction but we haven't done division.
I wish every parent realized how much potential young kids have before kindergarten. So underrated. Most kids can learn to read before 3 if you give them the right tools. Most can multiply before 5. But we wait too long to teach our kids and by the time kindergarten starts the average low income child is two years behind the average rich child. It's bullshyt.