The @import rule allows you to include external style sheets in your document. It is a way of creating a style sheet within your document, and then importing additional rules into the document. To use the @import rule, type: @import url(import1.css);
Math: 1st Grade. 1st graders continue to develop their addition and subtraction skills, gaining a deeper understanding of the concepts as they practice and gain mastery of these skills. In many classes, math tools and manipulatives, such as blocks, tiles, and different shapes are used to help students practice math using concrete, visible objects.
Take AP math classes. Because math is the language of astrophysics, you will need to start honing your math skills in high school. Take advanced classes like calculus AB and BC, computer science A and principles, and statistics classes. To qualify for AP classes in high school, take pre-algebra classes in middle school.