teacherwith2kids
'If you know that 2+2 = 4, what else do you know?'
[4-2=2, but also 20x20 = 400; 0.2 x 0.2 = 0.04 etc - again I do this kind of stuff very regularly]
Its great that you do this (I really mean that) but you must have noticed that many of your colleagues don't?
So, Ds1 have proved that he could do the 2+2 but in year 1, and the 4-2 as well. However, in Y2, the teacher returned to that. he went off and memorised the times tables by himself using a wall chart he found behind the sofa at home. However the year 3 teacher still insisted that he prove it, and then keep proving it. By now, he'd realised without support at school that 2020 = 210210 = 221010 = 4100. However, that didn't stop him doing it endlessly for years to come. Gods know, if they still think that he could do with a little more practise.