G4M1: Place Value, Rounding, and Algorithms for Addition and Subtraction. Contains 19 Lessons.

This lesson details how to facilitate a number talk. The target is 3rd grade students with addition, but this could also be used in 4th grade or at the end of 2nd grade. This task is remixable to provide more supports for various learners.

This lesson provides opportunities for students to examine what it means to subtract. Students solve tasks and write arguments and mathematical claims about how subtraction works.

Grade 1 Module 2: Introduction to Place Value Through Addition and Subtraction Within 20. Contains 29 Lessons.

Grade 1 Module 6: Place Value, Comparison, Addition and Subtraction to 100. Contains 41 Lessons.

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

In this assessment students will solve problems with pennies. There are five pennies in all. Some are hidden and some are not. Students will need to determine the number of pennies are under or outside the cup. Students should show 3 solutions. Teachers will need pennies or counters and cups. A rubric and assessment task sheet are provided.

Students decompose numbers less than or equal to 10 into pairs in more than one way by using objects or drawings, and they will record each decomposition by a drawing or equation (e.g. 5= 2 + 3 and 5 = 4+1).

This short video and interactive assessment activity is designed to teach second graders about selecting the correct addition sentence (sums to 100).

This site features a video overview of Addition (Sums to Twenty) for 1st Graders.

This short video and interactive assessment activity is designed to teach second graders about subtraction: selecting the correct sentence.

This short video and interactive assessment activity is designed to teach second graders about fluency in subtraction (numbers up to 20).

This short video and interactive assessment activity is designed to teach second graders about selecting the correct subtraction sentence.

This short video and interactive assessment activity is designed to teach second graders about addition: selecting the correct sentence.

This short video and interactive assessment activity is designed to teach second graders about selecting the incorrect subtraction sentence (numbers up to 20).

This course features a video review and an interactive assessment activity for selecting the correct addition sequence. It is aimed at first graders.

This short video and interactive assessment activity is designed to teach second graders about selecting the correct addition sentence.