Phase: | Before/Engage |
Activity: | Students will explore adding integers using two-color counter digital manipulatives. To begin the activity learners step forward one step (+1) and backward one step (-1). This helps kinesthetic learners connect integer values to spaces on a number line in relation to zero. Next, students connect positive and negative values to two-color counters. Red counters are used to represent negative values and yellow counters are used to represent positive values. Students use this information to develop a working definition of additive inverse and create and organize algorithms (a set of rules to follow) for given problems. Using the online tool, students model number sentences using two-color counters to find the solutions to 10 addition integer problems. Answers are recorded on the “Adding Integers Using Two-Colored Counters” activity page. Next students will develop addition integer rules for the following problem types, negative + negative, positive + negative, and negative + positive. At this point, the teacher should conduct a Think-Pair-Share with the class. Each student should have a partner. Ask the students to work with their partners and compare their addition integer rules. On their activity page, they are asked to explain how their rules are alike, how they are different, and to write a statement about what they feel is important to share with the class. Allow the students to share their statements with the class and address any misconceptions students may have. |
Assessment Strategies: | Assess student’s understanding by reviewing the student response page. The teacher will observe students using the digital tool Didix Two-Color Counters to assess organizing algorithms of adding integers. |
Advanced Preparation: | Visit the Didix two-color counter online resource to become familiar with how to use the tool. Students will need online access to the two-colored counters manipulatives. Copy the “Adding Integers Using Two-Colored Counters” student response page. |
Variation Tips (optional): | Students can write their own number sentences to use with the counter. These problems can be exchanged with classmates to solve. |
Notes or Recommendations (optional): | If the online resource is not available, red and yellow construction paper squares can easily be used. |
Keywords and Search Tags: | adding integers, addition, algorithm, Integer, integer operations, integers, models, number sentence, twocolored counters |