Lesson 1 What is One Thousandth?

    • Let’s make sense of thousandths.

Warm-up Estimation Exploration: One Tiny Piece

What fraction of the whole picture is a single square tile?

a tiled floor designed with many small square tiles

Record an estimate that is:

too low

about right

too high

Activity 1 What Do You Know About Thousandths?

  1. What do you know about 1 tenth?

  2. What do you know about 1 hundredth?

  3. What do you know about 1 thousandth?

Activity 2 Represent Numbers on a Hundredths Grid

  1. The grid represents 1. What does the shaded region represent?

    Be prepared to explain your reasoning.

    Diagram, square. Length and width, 1. Partitioned into 10 of the same size rectangles. 1 rectangle shaded. 

  2. The grid represents 1. What does the shaded region represent?

    Be prepared to explain your reasoning.

    Diagram, square. Length and width, 1. Partitioned into 10 rows of 10 of the same size rectangles. 1 shaded. 

  3. How many of the small rectangular pieces (one of them is shaded) are there in the unit square?

    Explain or show your thinking.

    Diagram, square. Length and width, 1. Partitioned into 10 rows of 10 of the same size squares. Top left square partitioned into 10 rows. 1 row shaded.

  4. How do you think we write the number one thousandth as a decimal? Explain your reasoning.

    Fraction

    Decimal

    ?

Practice Problem

Problem 1

  1. What fraction of the whole square is shaded? Explain or show your reasoning.

    Diagram, square. Length and width, 1. Partitioned into 10 rows of 10 of the same size squares. 1 square shaded.

  2. What fraction of the whole square is shaded? Explain or show your reasoning.

    Diagram, square. Length and width, 1. Partitioned into 10 rows of 10 of the same size squares. Top left square partitioned into 10 rows. 1 row shaded.