2.OA.1/ OPERATIONS AND ALGEBRAIC THINKING
MATH DOMAIN
2.OA.1/ OPERATIONS AND ALGEBRAIC THINKING
Grade 2
Math Cluster
Represent
and solve
problems
involving
addition and
subtraction.
Math Standard
August 2013
Mathematic Practices
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.
1. Make sense of problems and
persevere in solving them.
2. Reason abstractly and quantitatively.
3. Construct viable arguments and
critique the reasoning of others.
4. Model with mathematics.
5. Use appropriate tools strategically.
6. Attend to precision.
7. Look for and make use of structure.
8. Look for and express regularity in
repeated reasoning.
Reporting Standard
Trimester 1
Trimester 2
Trimester 3
Operations: Solve word problems using
drawing and equations.
Unknown is
the sum or
difference
(tested)
To 50 with
the unknown
in any
position
(tested)
To 100 with
the unknown
in any
position
(tested)
Clarify Standard
 A symbol should be used for the unknown.
 If a box is used for the unknown, the answer is not inserted into the box.
 The unknown is not a “blank” for the answer.
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2.OA.1/ OPERATIONS AND ALGEBRAIC THINKING
Task Analysis
1.OA.2 Solve word problems that call for addition of three whole numbers whose
sum is less than or equal to 20. Use equations with a symbol for the unknown number
to represent the problem.
Learning Tasks:
 Write equations with the unknown in any position.
 Effectively use drawings to reflect mathematical thinking.
 Choose appropriate operation.
 Solve one-step word problems.
 Solve two-step word problems.
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.
Vocabulary
Prior





Equation
Unknown
Equal to
Sum
Difference
Explicit









Add to
Take apart
Put together
Compare
Unknown
Equation
Equal to
Sum
Difference
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2.OA.1/ OPERATIONS AND ALGEBRAIC THINKING
2.OA.1 Sample Assessment Items earning a “3” in reporting system
 A Beluga whale is a toothed whale that grows to be about 15 feet long. They
are known as “sea canaries” because of their songs. Orca whales are also
toothed whales and they grow to be about 27 feet long. Orcas eat fish, squid,
and marine mammals. The pilot whale also eats squid and It is about 20 feet
long. A bottle nose dolphin is 11 feet long and is part of the whale family.

What two types of whales when measured in a line nose to tail with no
gaps are 26 feet long?

Which three types of whales when their lengths are added together
equal 46 feet long?
Assessment Rubric
1
No evidence of a strategy.
2
Evidence that the student used a correct strategy but answered incorrectly.
OR The student answered correctly with no evidence of strategy.
3
Evidence that the student used a correct strategy, and correct equation, and
answered correctly.
4
On a level 4 question: Evidence that the student used a correct strategy, and
correct equation, and answered correctly.
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2.OA.1/ OPERATIONS AND ALGEBRAIC THINKING
2.OA.1 Sample Assessment Items earning a “4” in reporting system
 Blue whales prefer to live in deep waters of the ocean and can stay underwater
for about 20 minutes. A blue whale died and washed ashore onto a beach a
few years ago.

If the Blue whale that died was the combined length of 4 Orcas plus the
difference between the length of a Beluga whale and a bottlenose
dolphin, how long was the Blue whale?
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