CCSS Mathematics Assessment Task

Grade Level: 2
Mathematics Domain and Cluster:
Domain: Number and Operations in Base Ten
Cluster: Use place value understanding and properties of operations to add and subtract.
Common Core standard(s) being assessed (if the task is intended to assess only one part of the standard, underline that part of the standard):
2.NBT.7 Add and subtract within 1000, using concrete models or drawings and strategies based on place value, properties of operations, and/or the relationship between addition and subtraction; relate the strategy to a written method. Understand that in adding or subtracting three-digit numbers, one adds or subtracts hundreds and hundreds, tens and tens, ones and ones; and sometimes it is necessary to compose or decompose tens or hundreds.
2.NBT.9 Explain why addition and subtraction strategies work, using place value and the properties of operations. (Explanations may be supported by drawings or objects.)
Student Materials:
·  Toothpicks Assessment Sheet
·  Pencil
Differentiation Option:
·  Base Ten manipulatives
Teacher Materials:
·  Base Ten manipulatives (Optional)
Directions (for teacher to administer assessment task):
·  Pass out Toothpicks assessment sheet (1 per student)
·  Tell students, “You will read the problem that Mr. Tam gave his students. Then, solve the problem using Sarah’s strategy. Finally, explain in words if it is possible to use Sarah’s strategy to solve the problem.”
·  Read prompt aloud to students.
·  Remind students, “ Do not forget to solve the problem using Sarah’s strategy and explain if it is possible to use Sarah’s strategy to solve the problem.”
·  Have students work independently on the task.
Differentiation Options:
·  Allow students to use Base Ten manipulatives if needed
Prompt:
See attachment
Correct or Model Answer:
57 + 36 = ______
50 + 30 = 80
7 + 6 = 13
80 + 13 = 93 toothpicks OR 80 + 10 + 3 = 93 toothpicks
It is possible to use Sarah’s strategy to solve the problem because Sarah is adding the all the numbers together to get her answer. She added all the tens and ones together to get how many toothpicks Chris had in the box.
Scoring Guide/Rubric (a score should be awarded for each criterion below)
Criteria (CCSS code) / 0 points / 1 Point / 2 Point
Fluently add and subtract within 100 using strategies based on place value and properties of operations. (2.NBT.5) / Attempts to solve the problem and there are major misconceptions OR is unable to solve the problem. / Solves the problem and/or has some minor misconceptions. / Solves both problems accurately using:
-Place value
-Properties of operations
Explain why addition and subtraction strategies work, using place value and the properties of operations. Explanations may be supported by drawings or objects.
(2.NBT.9) / Attempts to explain the place value strategy but has major misconceptions OR is unable to explain the strategy. / Explains the place value strategy with minor misconceptions. / Clearly explains the place value strategy.

Toothpicks

Second Grade Mathematics Assessment

Problem:
Mr. Tam read the following problem to his students.
Chris had 57 toothpicks in a box. Ann gave him 36 more toothpicks. How many toothpicks did Chris have now?
Sarah said that you could solve the problem by adding the hundreds, tens, and ones from each number together then adding those sums together. Is Sarah correct? Explain why or why not.
Solve the problem using Sarah’s strategy.
Is it possible to use Sarah’s strategy to solve the problem? Explain why.
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