Did them in my head, but not quickly. The trick is to look for look for shortcuts given the choice of answers and good estimating.
My wife did them in her head and got one wrong. I gave her a pen and paper to write down the one she got wrong and she got it right when she worked it out.
Yes, and trust they got them right
Same. Slowed down on the last one and finally threw in the towel. Got all the others right via “mental math.” None particularly hard.
My daily dose of Alzheimer’s fighting.
Yep. I got them all this way. I think that's part of the test.
Yup. Figuring what the last digit would be first saved a lot of time.