Primary Resources
Grid Multiplication
Ever have a completely confused fourth grader ask about multiplying a 3-digit by a 2-digit number? This slide show could really help clear things up. The grid or box method is fully demonstrated and explained in this straight...
Curated OER
Multiplication Grids Starter
How does grid or box multiplication work? Kids create a grid on their white boards then copy down the example problem in order to learn a new way to solve triple-digit multiplication. There are 5 practice problems with answers included.
NumberNut
Number Nut: Multiplication: Triple Digit Multiplication
Explains how to multiply two three-digit numbers. Includes related activities.