A matrix is a table without the labels
Choose any number in the table. See where it sits in the matrix and what it means. Rows run across and columns run down. The order is rows × columns.
Try this: find the row totals and column totals. What does each total count?
Add or subtract matching positions
Choose a cell in the answer. It uses only the numbers in the same position in A and B. Matrices must have the same order before you add or subtract them.
Can these be added?
A scalar stretches every element
Drag k. Look at every element of kA. Does the scalar change only one element or all of them?
Row × column, then add
Choose a cell of AB. The matching row of A and column of B light up. Then the working appears step by step.
Dimension checker: when does a product exist?
From pies sold to money taken
Change the prices. Money taken = pies sold × price for each type, added together. This is exactly one row of a matrix product.
Finish and review
Pressing Submit my work checks any answers you have not checked yet. It records your result and shows your review. You can still go back and fix answers, then submit again.