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Content Area: Math
Index: 4.1B Grade 2 CPI 4
Standard: 4.1 - Number and Numerical Operations
Strand: B - Numerical Operations
Cumulative Progress Indicator: 4 - The student will construct, use, and explain procedures for performing addition and subtraction calculations with: · Pencil-and-paper · Mental math
Grade: 2
Sample Activities:
· Second graders use popsicle sticks bundled as tens and ones to try to find a solution to the first two-digit addition problem they have formally seen: Our class has 27 children and Mrs. Johnson's class has 26. How many cupcakes will we need for our joint party? Solution strategies are shared and discussed with diversity and originality praised. Other problems, some requiring regrouping and others not, are similarly solved using the student-developed strategies.
· Students use calculators to help with the computation involved in a first-grade class project: to see how many books are read by the students in the class in one month. Every Monday morning, student reports contribute to a weekly total which is then added to the monthly total.
· Students look forward to the hundredth day of school, on which there will be a big celebration. On each day preceding it, the students use a variety of procedures to determine how many days are left before day 100.
· As part of their assessment, students explain how to find the answer to an addition or subtraction problem (such as 18 + 17) using pictures and words.
· Students find the answer to an addition or subtraction problem in as many different ways as they can. For example, they might solve 28 + 35 in the following ways: 8 + 5 = 13 and 20 + 30 = 50, so 13 + 50 = 63, 28 + 30 = 58. Two more is 60, and 3 more is 63, 25 + 35 = 60 and 3 more is 63.
· Students use estimation to find out whether a package of 40 balloons is enough for everyone in the class of 26 to have two balloons. They discuss the strategies they use to solve this problem and decide if they should buy more packages.
Kidspiration Activities:
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