Pre-algebra If you've mastered the basics of arithmetic and are ready to learn more about numbers and operations, you're in the right place! Community Questions Get a personal path through Pre-algebra Negative numbers and absolute value Factors and multiples Understanding and finding factors and multiples. After these videos, you'll be ready for fractions. Decimals Fractions Ratios, proportions, units, and rates Applying mathematical reasoning You already have many tools in your mathematical toolkit. In this topic, you'll use these in settings that you're likely to encounter in the real world! Exponents, radicals, and scientific notation Understanding and solving exponents without algebra. Arithmetic properties This tutorial will help us make sure we can go deep on arithmetic. We'll explore various ways to represent whole numbers, place value, order of operations, rounding and various other properties of arithmetic. Measurement From length to area to volume to time, thinking about how we measure things.