Adding Tens to Two-Digit Numbers

MatholiaChannel

This instructional video provides a clear, step-by-step guide on how to add multiples of ten to two-digit numbers using place value strategies. It progresses from a concrete visual model using linking cubes to abstract numerical methods. The video demonstrates the concept of 'adding like units'—specifically adding tens to tens—while keeping the ones digit constant or handling it separately. The content explores key mathematical themes including place value, decomposing (splitting) numbers, and mental math strategies for addition. It specifically introduces the strategy of separating a two-digit number into tens and ones to simplify the addition process. This supports the development of number sense and helps students move away from counting on by ones to more efficient calculation methods. For educators, this video serves as an excellent modeling tool for introducing or reinforcing two-digit addition. It bridges the gap between manipulatives and abstract equations, making it highly useful for visual learners. The clear breakdown of steps—separating tens and ones, adding the tens, and then recombining—provides a consistent algorithm that students can practice to build fluency in mental arithmetic.