This short video and interactive assessment activity is designed to give fourth graders an overview of telling time to quarter and hour.

This series of word problems requires students to determine which problems can be solved by multiplying 1/8_2/5.

This task presents an incomplete problem and asks students to choose numbers to subtract (subtrahends) so that the resulting problem requires different types of regrouping. This way students have to recognize the pattern and not just follow a memorized algorithm--in other words, they have to think about what happens in the subtraction process when we regroup. This task is appropriate to use after students have learned the standard US algorithm.

This instructional task requires students to add four numbers to find the solution.

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

This short video and interactive assessment activity is designed to teach fourth graders about total length in compound units (english units).

This short video and interactive assessment activity is designed to teach third graders an overview: sum of the angles of a triangle.

This short video and interactive assessment activity is designed to give fourth graders an overview of the sum of the angles of a triangle.

This short video and interactive assessment activity is designed to teach fifth graders about turning numbers into words within word problems.

This short video and interactive assessment activity is designed to teach third graders about turning words into numbers using place value models.

Both of the questions in this task are solved by the division problem 12Ö3 but what happens to the ribbon is different in each case.

This short video and interactive assessment activity is designed to give fourth graders an overview of metric capacity operations.

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.

This short video and interactive assessment activity is designed to teach third graders about given the perimeter, find the side length and area - squares.

This short video and interactive assessment activity is designed to teach fourth graders how to, given the perimeter, find the side length and area - squares.

This short video and interactive assessment activity is designed to teach fifth graders about using the four operations with money - word problems.

This short video and interactive assessment activity is designed to teach fourth graders about using the four operations with money - word problems.

This short video and interactive assessment activity is designed to teach third graders about understanding division with remainders and illustrations.

This short video and interactive assessment activity is designed to teach fifth graders about multiplication and division with money.