This is a set of 24 task cards that each present a rate and give students a question to solve based on that rate. Each answer gives either a whole number answer or a mixed number (with the fraction 1/2). There are 12 different rates presented (each one appears twice in the deck) and two different questions asked. In one case, students have to find the time needed for a given task, in the other the number of times the task could be completed in a given amount of time.
Each situation could be solved without a formal proportion using reasoning, however I made these specifically to give my students more situations in which a proportion could be used. The answer sheet gives half of the proportion (the rate) and the students have to complete it and solve for the missing number. These match Common Core 6.RP.3b.
I teach above level fifth graders and have been creating things for the kids to apply proportional thinking. I kept the numbers fairly compatible so that the majority of the focus would be on figuring out which part of the situation was proportional. I made these as beginner level task cards for kids who have experience with proportional reasoning, but not with rate problems. They were able to solve the problems without using a formal "cross-multiplying" procedure, but by using reasoning. The kids really enjoyed these and found some of them quite challenging.
This is an 8-page PDF file that includes 24 task cards (4 per page for 6 pages), a 1-page recording sheet with partial proportions, and a 1-page answer key.