Not "4×20", but "4 20", and in a single word that means "80" without thinking about 4 and 20. When you say eighteen, you think just "18" and not "8 teens". (Si

Not "4×20", but "4 20", and in a single word that means "80" without thinking about 4 and 20. When you say eighteen, you think just "18" and not "8 teens". (Similarly, when you say "backwards" you think of the direction, not of "back wards")