Work backwards to find a missing side
7 × 12 = 84 square units G4
How this one works
How
divide the area by the side you know to find the side you do not.
Best when
you are given the area instead of both sides.
seen one of these on a test? See it on a real question: TEKS 3.6C, area with unit squares, or TEKS 4.5D, perimeter and area of rectangles.
The same problem, other ways