This is a task from the Illustrative Mathematics website that is one part of a complete illustration of the standard to which it is aligned. Each task has at least one solution and some commentary that addresses important aspects of the task and its potential use.

This short video and interactive assessment activity is designed to teach second graders about identifying parallel and perpendicular lines.

This short video and interactive assessment activity is designed to teach fourth graders about calculating quotients (numbers up to 100,000).

This short video and interactive assessment activity is designed to teach fourth graders about identifyinging prime or composite numbers.

This short video and interactive assessment activity is designed to teach third graders an overview of quarter-circles and semi-circles.

This short video and interactive assessment activity is designed to teach second graders an overview of quarter-circles and semi-circles.

This short video and interactive assessment activity is designed to give fourth graders an overview of quarter-circles and semi-circles.

This short video and interactive assessment activity is designed to teach third graders an overview of reflective symmetry.

This short video and interactive assessment activity is designed to teach first graders an overview of quarter-circles and semi-circles.

This short video and interactive assessment activity is designed to teach third graders about identifying the multiples of a given number.

This short video and interactive assessment activity is designed to teach third graders about identifying the properties of squares.

This short video and interactive assessment activity is designed to teach third graders about inequalities.

This short video and interactive assessment activity is designed to teach fifth graders about inequalities with addition and subtraction of fractions.

This is a task from the Illustrative Mathematics website that is one part of a complete illustration of the standard to which it is aligned. Each task has at least one solution and some commentary that addresses important aspects of the task and its potential use.

This is a task from the Illustrative Mathematics website that is one part of a complete illustration of the standard to which it is aligned. Each task has at least one solution and some commentary that addresses important aspects of the task and its potential use.

The purpose of this task is to help students articulate their addition strategies and would be most appropriately used once students have a solid understanding of coin values.

The purpose of this task is to present students with a situation where it is natural to add fraction with unlike denominators; it can be used for either assessment or instructional purposes.

The purpose of this task is to present students with a context where they need to explain why two simple fractions are equivalent.

This is a task from the Illustrative Mathematics website that is one part of a complete illustration of the standard to which it is aligned. Each task has at least one solution and some commentary that addresses important asects of the task and its potential use. Here are the first few lines of the commentary for this task: #### Materials * 10-15 quart plastic bags of various counters (different numbers of counters in each bag) * A recording sheet for the activity with pic...

This is a task from the Illustrative Mathematics website that is one part of a complete illustration of the standard to which it is aligned. Each task has at least one solution and some commentary that addresses important asects of the task and its potential use. Here are the first few lines of the commentary for this task: Material * Assorted objects to create the groups * Clear ziplock bags or small cups * Index cards and stickers * An egg timer or a kitchen timer Action...