## IM Commentary

Note that in each of these problems we are given a set of a specified size and a specified number of subsets into which it is to be divided. The questions ask the student to find out the size of each of the subsets. Students are not expected to know e.g. that there are 5280 feet in a mile. If this is to be used as an assessment task, the conversion factors should be given to the students. However, in a teaching situation it is worth having them realize that they need that information rather than giving it to them upfront; having students identify what information they need to have to solve the problem and knowing where to go to find it allows them to engage in Standard for Mathematical Practice **5, Use appropriate tools strategically. **

## Comments

Log in to comment## Lori says:

over 1 yearHaving raised several puppies, I believe problem a. is realistic. Since puppies need to be let out throughout the night, someone should be assigned the night shift, in order to avoid arguments between the brothers.

## sbaldrid says:

almost 6 yearsProblem a. Since no one actually watches a puppy at 3:00a.m. (unless he or she cannot help it), the problem seems unrealistic. I'd turn the problem into one about 5 knights guarding a castle in a watch tower. While it is a problem based upon fantasy, it is at least realistic in regards to the fantasy.

## Amanda Zerr says:

about 6 yearsDoes anyone have ideas of a simple visual model that will help students understand these concepts?

## Sarah says:

about 5 yearsCuisenaire rods, bar models and number lines are tools we use when operating with fractions. Because they are linear contexts, all of those tools could be used for each context.

## strugs says:

over 6 yearsI like the examples and the explanations. We can change the scenarios and come up with several problems for classroom practice.

## Kristin says:

over 6 yearsGlad you like the task! We'd like to collect student work to go with some of the tasks. If you do use this task with your students and can get permission to save it, please send us copies and maybe we can include it on the website.

Also, if you find any ways the task can be improved as you use it, do let us know.