Lindsay finds a pattern from multiplying 1-digit numbers by 10, 100, and 1000. Practice this yourself on Khan Academy right now: https://www.khanacademy.org/math/cc-fourth-grade-math/cc-4th-mult-div-topic/cc-4th-mult-10s-100s-1000s/e/multiply-1-digit-number-by-10--100-1000 Watch the next lesson: https://www.khanacademy.org/math/cc-fourth-grade-math/cc-4th-mult-div-topic/cc-4th-area-models/v/more-ways-to-think-about-multiplying Missed the previous lesson? https://www.khanacademy.org/math/cc-f