Mastering Long Division with Double-Digit Divisors

Math with Mr. J

This instructional math video guides students through the process of long division using double-digit divisors. The instructor, Mr. J, demonstrates the standard algorithm step-by-step using four distinct examples that increase in difficulty. He begins with "friendly" divisors like 10 and 25 that allow for mental math, before moving to more challenging divisors like 42 and 56 that require estimation and side-work calculations. The video focuses on two main themes: the procedural steps of long division (Divide, Multiply, Subtract, Bring Down, Repeat) and strategies for determining multiples of difficult divisors. A significant portion of the video models the trial-and-error process needed when students don't know multiplication facts for large numbers, showing them how to estimate, check, and adjust their thinking. For the classroom, this video serves as an excellent model for explicit instruction on multi-digit division. It normalizes the need for "scratch work" or side calculations, which is often a point of frustration for students. Teachers can use the later examples to teach estimation strategies and perseverance in problem-solving, while the earlier examples reinforce the basic algorithm structure.