This educational video introduces students to the concept of adding single-digit numbers to two-digit numbers within the range of 50. Using a clear, step-by-step approach, the video demonstrates the "counting on" strategy, which is a fundamental mental math skill for early learners. The visual presentation moves from concrete representations using base-ten blocks (cubes) to more abstract representations using number lines and numerical equations. The key themes explored include place value, addition strategies, and the connection between visual quantities and written numerals. The video specifically focuses on the "counting on" method, where learners start with the larger number and advance forward by the value of the smaller number. It covers three distinct examples: a standard addition problem without regrouping (34 + 4), a problem bridging a decade (39 + 3), and a problem completing a decade (44 + 6). For classroom application, this video serves as an excellent instructional tool for 1st and 2nd-grade math lessons. It is particularly useful for visual learners who benefit from seeing physical quantities (cubes) alongside the abstract number line movement. Teachers can use this video to introduce the counting-on method, reinforce number sense, or support struggling students during small group interventions. The clear audio and pacing allow for pauses where students can predict answers before they are revealed.