Formative Instructional and Assessment Tasks

Clothing Prices
4.OA.2- Task 2
Domain / Operations and Algebraic Thinking
Cluster /

Use the four operations with whole numbers to solve problems.

Standard(s) / 4.OA.2 Multiply or divide to solve word problems involving multiplicative comparison, e.g., by using drawings and equations with a symbol for the unknown number to represent the problem, distinguishing multiplicative comparison from additive comparison.
Materials / Paper and pencil
Task / Part 1:
Two stores in Greensboro sell shirts and pants together in matching outfits. In Store A, pants are half the cost of shirts. In Store B, pants are $4 less than the cost of shirts. For each Store complete the table below.
Part 2:
If a shirt costs $30 how much will the matching pants cost in each store? For each store, write an equation to show your work. Write a sentence explaining your strategy for finding the cost of the pants.
Store A / Store B
Shirts / Pants / Shirts / Pants
10 / 10
6 / 8
14 / 14
16 / 16
9 / 18
20 / 20
Rubric
Level I / Level II / Level III
Limited Performance
·  The student has not shown a clear understanding about how to find equivalent fractions. / Not Yet Proficient
·  Answer is correct, but the explanation is unclear OR work is logically shown but the student has made a calculation error. / Proficient in Performance
·  Solutions: Store A: 5, 12, 7, 8, 18, 10. Store B: 6, 12, 10, 12, 14, 16.
AND
·  If shirts cost $30, pants would cost $15 in Store A and $26 in Store B.
AND
·  The equation is correct and the sentence includes that Store A can be found by dividing and Store B can be found by subtracting.
Standards for Mathematical Practice
1. Makes sense and perseveres in solving problems.
2. Reasons abstractly and quantitatively.
3. Constructs viable arguments and critiques the reasoning of others.
4. Models with mathematics.
5. Uses appropriate tools strategically.
6. Attends to precision.
7. Looks for and makes use of structure.
8. Looks for and expresses regularity in repeated reasoning.


Clothing Prices

Part 1:

Two stores in Greensboro sell shirts and pants together in matching outfits. In Store A, pants are half the cost of shirts. In Store B, pants are $4 less than the cost of shirts. For each Store complete the table below.

Store A / Store B
Shirts / Pants / Shirts / Pants
10 / 10
6 / 8
14 / 14
16 / 16
9 / 18
20 / 20

Part 2:

If a shirt costs $30 how much will the matching pants cost in each store? For each store, write an equation to show your work. Write a sentence explaining your strategy for finding the cost of the pants.

NC DEPARTMENT OF PUBLIC INSTRUCTION FOURTH GRADE