This is a bundle of 40 task cards (2 sets of 20 cards each) that I created to use with my students as they learn ratio and proportion in the context of scale drawings.
Twelve of the cards in each set have a shape and students are given the scale. They must measure the shape with a ruler (cm or inch) and then calculate the actual size. The final eight cards give the shape and tell the students the actual size of the object. They must work backwards to find the scale (1 cm = n). The measurements fall either on the whole inch/cm or the half inch/cm, and the cards range in difficulty level from basic to challenging.
The second set was created to help kids handle either actual measurements or scales that were not whole numbers (halves). The drawings used on the two sets are the same, but the scales have been modified to make set two more difficult.
I typically have the kids work in pairs to solve these problems, but they could be used for a math center if students had experience with scaling. (I also print the cards directly to a printer because I have issues with the copier at my school slightly shrinking images and it throws off the measurements.)
I used these to help students with proportional thinking (Common CORE 6.RP.3), but they also address 7.G.1 (Scale Drawing).
This is a 14-page PDF file that included 10 pages of task cards (4 per page), two 1-page recording sheets, and two 1-page answer keys. Each set is available separately under different listings.