Know how to add three whole numbers I can solve addition problems using the draw a To further students’ understanding of the concept of addition, students create word picture strategy. whose sum is less than or equal to 20. problems with three addends. They can also increase their estimation skills by creating I can add three addends. problems in which the sum is less than 5, 10 or 20. They use properties of operations and different strategies to find the sum of three whole numbers such as: Counting on and counting on again Reasoning Target (e.g., to add 3 + 2 + 4 a student writes Solve word problems that call for addition of 3 + 2 + 4 = ? and thinks, 4, 5, that’s “3, 2 more, 6, 7, 8, 9 that’s 4 more so 3 + three whole numbers whose sum is less 2 + 4 = 9.” than or equal to 20 Making tens (e.g., 4 + 8 + 6 = 4 + 6 + 8 = 10 + 8 = 18) Using 10, minus 1” to add 9 (e.g., “plus 3 + 9 + 6 A student thinks, is close “9 to 10 so I am going to add 10 plus 3 plus 6 which gives me 19. Since I Performance Target added 1 too many, I need to take 1 away so the answer is 18.) Decomposing numbers between 10 and 20 into 1 ten plus some ones to facilitate adding the ones Using doubles Using near doubles (e.g.,5 + 6 + 3 = 5 + 5 + 1 + 3 = 10 + 4 =14) Students may use document cameras to display combining strategies. This gives them the opportunity to communicate and justify their thinking.
Know how to add three whole numbers whose sum is less than or equal to 20. I can solve addition problems using the draw a picture strategy. I can add three addends. To further students’ understanding of the concept of addition, students create word problems with three addends. They can also increase their estimation skills by creating problems in which the sum is less than 5, 10 or 20. They use properties of operations and different strategies to find the sum of three whole numbers such as: Counting on and counting on again (e.g., to add 3 + 2 + 4 a student writes 3 + 2 + 4 = ? and thinks, “3, 4, 5, that’s 2 more, 6, 7, 8, 9 that’s 4 more so 3 + 2 + 4 = 9.” Making tens (e.g., 4 + 8 + 6 = 4 + 6 + 8 = 10 + 8 = 18) Using “plus 10, minus 1” to add 9 (e.g., 3 + 9 + 6 A student thinks, “9 is close to 10 so I am going to add 10 plus 3 plus 6 which gives me 19. Since I added 1 too many, I need to take 1 away so the answer is 18.) Decomposing numbers between 10 and 20 into 1 ten plus some ones to facilitate adding the ones Using doubles Using near doubles (e.g.,5 + 6 + 3 = 5 + 5 + 1 + 3 = 10 + 4 =14) Students may use document cameras to display combining strategies. This gives them the opportunity to communicate and justify their thinking. Reasoning Target Solve word problems that call for addition of three whole numbers whose sum is less than or equal to 20 Performance Target
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