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I love how this websites explains matrix multiplication with the stacking method. The visuals are very effective.

We finally began 2-digit by 2-digit multiplication this week! The kids are absolutely loving the matrix box we use to introduce 2x2 multiplication!! They love it because it's super easy. I love it because it shows them the place value involved in 2x2 multiplication. They can actually see the process of multiplying the ones and tens of one number by the ones and tens of the second number.

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Curve Fitting & Matrix Lite Android App - playslack.com , No internet connection and nor uncomfortable ads, Curve Fitting & Matrix Lite is FREE!The recent version contains many features and with user interface improved. This Mathematical program contains the following powerful tools:- Robust Non Linear Fitting (Regression) Tool - Interpolation Calculator- Matrix Calculator- Periodic TableCurve fitting tool performs statistical regression analysis to estimate the values of parameters…

They can actually see the process of multiplying the ones and tens of one number by the ones and tens of the second number. When they finally move to vertical multiplication, they'll actually understand why they put zeros here.

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