All the Years since First Grade
No, you would not include Preschool
Technically, for this question, you would put the number of years since you began learning basic math. For the vast majority of children, they begin learning Basic Math such as adding and subtracting whole numbers in First Grade. Therefore, you would include all of the years since First Grade. Preschool usually teaches children about numbers and how to count, as well as develop their social skills. Preschool does not teach basic math because the children are just learning about numbers.