I use this activity every year for my students. When I teach the dreaded word problems unit involving slope and y-intercept, I introduce the y=mx+b setup, where students must practice identifying the rate/slope, the initial amount (we don't call it y-intercept until the next unit), and identifying what the x and y values represent.Simply cut out the larger words in this activity, and put them in envelopes 1-12 (I call these "puzzles" for my kids). In this activity, the students work with partners to arrange the "puzzles" into the correct spaces on their answer sheet. I make my students check their arrangements with me before copying their answers into the spaces. When they have the correct arrangement, I simply stamp their space, and tell them to copy then get another envelope with a different problem. My students communicate with each other by mentioning rate/changing/slope (so many vocab words get utilized), take turns reading the problem aloud, and answer questions that I pose throughout the activity. I will ask students "how do you know this is the rate?", "why is this slope negative?", etc. just to get them thinking a bit more. My students really get into this and are determined to collect 12 stamps.