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# UP:MA19.A2.4

### Vocabulary

• Appropriate dimensions

### Knowledge

Students know:

• The aspects of a matrix with regard to entries, rows, columns, dimensions, elements, and subscript notations.

### Skills

Students are able to:

• Strategically choose and apply appropriate representations of matrices on which arithmetic operations can be performed.

### Understanding

Students understand that:

• Matrix addition and subtraction may be performed only if the matrices have the same dimensions.
• Matrix multiplication can be performed only when the number of columns in the first matrix equal the number of rows in the second matrix.
• There are many contextual situations where arithmetic operations on matrices allow us to solve problems.

### Body

1. Add, subtract, and multiply matrices of appropriate dimensions.