Formative Instructional and Assessment Tasks

Adding Zeros
4.NBT.1 Task 2
Domain / Numbers and Operations in Base Ten
Cluster / Generalize place value understanding for multi-digit whole numbers.
Standard(s) / 4.NBT.1 Recognize that in a multi-digit whole number, a digit in one place represents ten times what it represents in the place to its right.
Materials / Paper and pencil
Task / Give students the following writing prompt:
Gina said, “Forty-six multiplied by 10 is 460 because when you multiply a number by ten, you add a zero on to the end of it.” Do you agree or disagree with Gina? Explain your reasoning. Give at least one example to support your reason.
Rubric
Level I / Level II / Level III
Limited Performance
·  Students think that multiplying by ten is like adding a zero on to a number. They do not understand the relationship between multiplying by ten and the place value shift that digits make. / Not Yet Proficient
·  The student may agree or disagree, but cannot clearly articulate that 46 x 10 = 460 because each digit is ten times as much and shifts place value one place to the left. The student cannot generate an example to support this idea. / Proficient in Performance
·  The student may agree or disagree, and can clearly articulate that 46 x 10 = 460 because each digit is ten times as much and shifts place value one place to the left. The student is able to generate an example to support this idea.
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.

Adding Zeroes

Gina said, “Forty-six multiplied by 10 is 460 because when you multiply a number by ten, you add a zero on to the end of it.”

Do you agree or disagree with Gina? Explain your reasoning. Give at least one example to support your reason.

NC DEPARTMENT OF PUBLIC INSTRUCTION FOURTH GRADE