Vectors (and calculus) are introduced in Shormann Algebra 1 and built upon throughout Algebra 1, Precalculus and Calculus. For example, in Shormann Algebra 1, all we do with vectors is define them and have the students describe them graphically with arrows. It's actually something a pre-algebra student could do. However, having this basic understanding of vectors will make it much easier for students to grasp vectors when numbers and calculations are added in Shormann Algebra 2.