This About the Cluster is from the authors of the NC2ML Instructional Frameworks. It provides background information about the mathematics content and pedagogy. This is not remixable since it has been created by the authors of the NC2ML Instructional Frameworks.

This is an interactive game for students to use independently to practice addition, subtraction, multiplicaton, division, and two step equations.

In this assessment task students will read and answer the riddle, then they will use place value, addition and subtraction to determine the answer to the riddle. An assessment task sheet and rubric are provided.

In this engaging interactive, students must click on the frogs so they will jump in the water before they cross the finish line. Students will use subtraction to determine how many frogs jumped in the water.

This task acts as a bridge between understanding place value and using strategies based on place value for addition and subtraction.

This short video and interactive assessment activity is designed to teach first graders an overview of subtraction (numbers to 100).

This video lecture serves as a review of subtraction up to the number twenty for first graders.

The purpose of this task is for students to select 2 numbers from a set of 3 that sum to 9. The task can be completed for sums equaling any number. Teachers may choose to ask students to write the simple equations they select.

This Thinglink provides a series of brief videos addressing a) common areas of difficulty related to problem solving and b) an overview of additional and subtraction problem types.

Students will learn to round two and three digit number to the nearest ten and understand the value and place value of a number. Students will then work in pairs and play a game to help them understand the concept of rounding.

In this challenging instructional task students relate addition and subtraction problems to money and to situations and goals related to saving money.

This word problem may be used for instructional or assessment purposes, depending on where students are in their understanding of addition and how the teacher supports them.

Students will show strategies to find the missing addend in a number sentence.

The purpose of this task is for students to select 2 numbers from a set that sum to 5 (or any other number).

Students gain experience and practice with three types of word problems using the "Take From" context: result unknown, change unknown, and start unknown.

Students relate counting to subtraction. Students roll a die and make a set of counters that is one less than the number rolled. They use pictures, numbers, or words to show their work, make sets, and record their work.

Students represent a given number with Base Ten blocks, take away 10 and record the new number. Students continue doing this until they reach the number 12. Then students choose another 2-digit number between 75 and 89 repeating their initial steps in efforts to get a number as close to zero as possible.

This short video and interactive assessment activity is designed to teach second graders about subtracting 3 numbers - word problems.

This short video and interactive assessment activity is designed to teach second graders about subtracting one-digit numbers - word problems.