Making a Scarf nf. 1 – Task 3 Domain



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Formative Instructional and Assessment Tasks




Making a Scarf

3.NF.1 – Task 3

Domain

Number and Operations - Fractions

Cluster

Develop understanding of fractions as numbers.

Standard(s)

3.NF.1 Understand a fraction 1/b as the quantity formed by 1 part when a whole is partitioned into b equal parts; understand a fraction a/b as the quantity formed by a parts of size 1/b.

Materials

paper, pencils, manipulatives, rulers (optional)

Task

Read: Martha is making a scarf for her sister. Each day she knits 1/6 of a scarf.

Ask:


  • What fraction of the scarf will be complete after three days?

  • What fraction of the scarf will be complete after six days?

  • How can you use a number line to prove that your answers are correct?




Rubric

Level I

  1. Level II

Level III

Limited Performance

  • Student uses inappropriate solution strategy and does not obtain the correct solution.




  1. Not Yet Proficient

Student does 1-2 of the following:

  • Student identifies that 3/6 (or 1/2) of the scarf will be complete after three days.

  • Student identifies that 6/6 of the scarf will be complete after six days.

  • Student uses a number line to justify solutions.

Proficient in Performance

  • Student identifies that 3/6 (or 1/2) of the scarf will be complete after three days.

  • Student identifies that 6/6 of the scarf will be complete after six days.

  • Student accurately uses a number line to justify solutions.



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.



Making a Scarf
Martha is making a scarf for her sister. Each day she knits 1/6 of a scarf.
What fraction of the scarf will be complete after three days?

What fraction of the scarf will be complete after six days?



How can you use a number line to prove that your answers are correct?



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