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Videos, worksheets, solutions, and activities to help Algebra students learn about matrix addition, subtraction and scalar multiplication.

A matrix is a rectangular arrangement or array of numbers called elements.

The dimension m × n of a matrix identifies how many rows and columns a specific matrix has. The number of rows is m and the number of columns is n.

A number or element in a matrix is denoted a

The sum of two matrices can only be found if both matrices have the same dimension. We add matrices by adding corresponding elements.

The difference of two matrices can only be found if both matrices have the same dimension. We subtract matrices by subtracting corresponding elements.

The product of a scalar and a matrix is equal to the scalar times each element in the matrix.

Matrix Addition, Subtraction, and Scalar Multiplication

This video shows how to add, subtract and perform scalar multiplication with matrices.

How to add and subtract them.

If they both have the same dimensions (same number of rows and columns) then you just add up the numbers that are in the same spot.

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