Download 2OA1-Mrs.-Smiths-Class-Problem-2

CCSS Mathematics Assessment Task
Mrs. Smith’s Class #2
Grade Level: 2
Mathematics Domain and Cluster:
Domain: Operations and Algebraic Thinking
Cluster: Represent and solve problems involving addition and subtraction.
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.OA.1: Use addition and subtraction within 100 to solve one- and two-step word problems involving situations
of adding to, taking from, putting together, taking apart, and comparing, with unknowns in all positions, e.g., by
using drawings and equations with a symbol for the unknown number to represent the problem.
Student Materials:



Mrs. Smith’s Class Assessment (Problem #2)
Pencil
Hundreds Chart, Number Line, Interlocking Cubes (as needed)
Teacher Materials:

none
Directions (for teacher to administer assessment task):




Hand out the assessment (one per student)
Tell students, “If you need to use a hundred chart or interlocking cubes, feel free to use them as
needed.”
For those students that need the problem read aloud you might want to pull them into a small group.
Have students work independently on task.
Prompt:
See attachment.
Correct or Model Answer:
☐ + ☐ = 16
16 = 1 sharpened + 15 unsharpened
16 = 2 sharpened + 14 unsharpened
16 = 3 sharpened + 13 unsharpened
16 = 4 sharpened + 12 unsharpened
16 = 5 sharpened + 11 unsharpened
16 = 6 sharpened + 10 unsharpened
16 = 7 sharpened + 9 unsharpened
16 = 8 sharpened + 8 unsharpened
16 = 9 sharpened + 7 unsharpened
16 = 10 sharpened + 6 unsharpened
16 = 11 sharpened + 5 unsharpened
16 = 12 sharpened + 4 unsharpened
16 = 13 sharpened + 3 unsharpened
CCSS Mathematics Assessment Task
16 = 14 sharpened + 2 unsharpened
16 = 15 sharpened + 1 unsharpened
Teacher Notes:

Students can also use number strings or drawings to solve. Drawings as a strategy would not be
appropriate to use at the end of the year as it is not efficient or an accurate strategy when the numbers
get bigger.
Scoring Guide/Rubric (a score should be awarded for each criterion below)
Criteria (CCSS code)
0 points
1 Point
2.OA.1: Use addition and
subtraction within 100 to
solve one- and two-step
word problems involving
situations of adding to,
taking from, putting
together, taking apart,
and comparing, with
unknowns in all positions,
e.g., by using drawings
and equations with a
symbol for the unknown
number to represent the
problem.
Student is not able to
write an equation, or
draw a picture or model,
and solves with significant
errors.
Student is able to write an
equation and draw a picture
or model, but solves with
minor inaccuracies OR
student is able to write an
equation or draw a model.
2 Point
Student is able to write an
equation AND draw a
picture or a model, then
solves accurately.
CCSS Mathematics Assessment Task
Mrs. Smith’s Class Problem #2
Second Grade Mathematics Assessment
Problem:
Solve the following problems by drawing and using equations.
Mrs. Smith has 16 pencils. Some of them are sharpened and some of them are not. How
many are sharpened and how many are not sharpened?
Draw a picture that matches the number story.
Write the equation: