My teacher had me use scratch marks which she called sticks. I had to write short lines on the paper when counting and then I learned to count on my fingers. Then I also had to memorize the times tables. I never got to memorize addition or subtraction because I was in a self contained classroom so it was always counting on my fingers. I did use tiles to do double digit maths when I was eight until I learned I can go back to one on my fingers after I run out. But I would count so fast I always got the answers wrong. I was also visual.
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Son: Diagnosed w/anxiety and ADHD. Also academic delayed and ASD lv 1.
Daughter: NT, no diagnoses. Possibly OCD. Is very private about herself.