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This problem offers an opportunity for students to consider common factors while gaining fluency in multiplication facts. The interactivity engages students' curiosity and perseverance by challenging them to complete the grid using a minimum number of 'reveals'.
Multiplication tables are often presented with row and column headings filled in, with students challenged to fill in the products. This task inverts that concept, as students can reveal chosen products and work out possibilities for the headings.
If computers or tablets are available, students could work in pairs using the interactivity. Students could try a few examples to get the idea, and then work on the challenge of trying to find the grid headings by revealing as few cells as possible. Once they have developed some strategies, they could try the larger grids that include bigger numbers.
Can you find a way to work out the row and column headers using only 6 reveals?
Mystery Matrix works in the same way, but some helpful cells have already been revealed.