Introduction to Subtraction by Taking Away

Khan Academy

This video introduces the fundamental concept of subtraction through a clear, visual "taking away" method. Using a digital whiteboard, the narrator demonstrates two specific problems: 4 minus 3 and 5 minus 2. For each problem, the process involves drawing a set of objects representing the starting number, physically crossing out the number of objects being subtracted, and counting the remaining objects to find the answer. The content focuses on building conceptual understanding rather than rote memorization. By linking the abstract numerical equation to concrete visual representations (purple circles), the video helps young learners visualize what the minus sign actually operations. It also subtly introduces algebraic thinking in the second example by presenting the equation with the unknown on the left side (3 = 5 - 2). Ideally suited for early elementary classrooms, this video serves as an excellent hook for introduction to subtraction lessons or as a remediation tool for students struggling with the concept. Teachers can use it to bridge the gap between manipulative-based math and writing equations. It models a specific strategy—drawing pictures to solve problems—that students can immediately adopt in their own independent work.