https://www.khanacademy.org/kmap/numbers-operations-the-real-complex-number-systems-218-223lp/x051388881a1e2948:numbers-operations-the-real-complex-number-systems7 2026-06-26T15:40:50.739424638Z Numbers & Operations - The Real & Complex Number Systems 218-223 The most fundamental branch of math is arithmetic operations. It consists of adding, subtracting, multiplying, and dividing numbers. We're willing to bet that doing these operations on whole numbers is a piece of cake, but now we'll mix those numbers up with decimals and fractions. So sharpen that pencil and relax in your chair, we're going for a ride! unit