Maths and 10 year olds

As someone who can barely remember what I had for lunch each day for the last week I am struggling to check my daughter's maths homework, despite being an accountant for more years than I care to recall. We have recently been looking at the differences between area and volume today. I became more than a little agitated -at one point I looked skywards and must have transmitted my dismay to my daughter. Looking on the bright side of things she patently has no problem with English because her reply was "I'm not stupid dad, just partially confused"