My ds9 did this at 5.5 yrs old and again at 6.5 yrs old. The last time, he was using his fingers to subtract, according to the report. Same child who has a portfolio package for DYS, but lacks the test scores since he keeps blowing off the tests. Sigh.

I've been holding off re-testing him until he's ready or I have more confidence that he isn't going to blow off the test.