This short video and interactive assessment activity is designed to teach second graders about mixed operations: addition and subtraction i - word problems.

This Nim-like interactive Flash game provides an opportunity to practice basic addition and subtraction while developing strategic thinking through generalization and by applying knowledge of factors and multiples. It can be played against the computer or a friend. Players take turns adding a whole number from 1 to 4 to a running total. The player who hits the target of 23 wins. Computer settings allow changing the target number, the range of numbers to add, who goes first, and whether the player reading the target wins or loses. The Teachers' Notes page offers suggestions for implementation, discussion questions, ideas for support, and links to related games.

This lesson uses iMovie and Pages to solidify student understanding of math problem-solving. It is tied to problem solve at a 2nd-grade level or higher for kids with learning deficits, specifically designed to help students who have IEP goals related to math word problems and solving math problems related to the four basic arithmetic operation.

Open Middle tasks provide opportunities for student to approach a mathematical task using different strategies and representations. They can be used as a warm-up/closing activity, as a formative assessment, or to facilitate discourse and discussion and get insite into student thinking and problem solving. These tasks provide a great opportunity for student to engage with the Standards for Mathematical Practice.

This web page provides instructions for a game that develops number sense, basic addition and subtraction skills, and strategic thinking. Beginning with 10 Cuisenaire rods, one of each length from 1 (white) and 10 (orange), two players take turns adding one rod at a time to a train until it reaches a previously agreed-on length between 11 and 55. The player who puts down the last rod to complete the goal length is the winner. The game can be played with real rods, with the Flash applet provided, or with numbers on paper.

This is a quick game that can be played to practice addition. It provides fun by tempting a player with making that next roll to get a higher score. Soft dice or an app to simulate a dice roll can make this a quiet activity for fun and practice.