Cross products
cross-products · skill · prompt: Find the cross products of {a}/{b} and {c}/{d}.
| Method | Idea | Best when | Calls |
|---|---|---|---|
Multiply the diagonals diagonals |
Multiply each numerator by the other fraction’s denominator. | — |
Each graph starts at the question and branches at × Which first step? into every first step a student might write. Methods that share a first step meet there and split at × Which next step?. Each route then follows its method to the answer. The legend at the bottom of each graph explains the shapes.
Find the cross products of 3/4 and 5/7.
Find the cross products of 6/8 and 72/96.
