My 11-year-old suddenly was having trouble with sums that he could do in his head at 6. He can still easily do the same sums in real life situations, ie. baking, doing his budget, math drills with a competitor, etc. I was at a loss. Until I followed the advice of another homeschool mom who said to try having him do his drills while bouncing on the trampoline. It works! I think his brain just sometimes turns off when his bottom is in a chair. 😂