Lesson 12 Order Numbers

    • Let’s put numbers in order.

Warm-up Number Talk: Subtract Tens

Find the value of each expression mentally.

Activity 1 Who is Out of Order?

Kiran and Andre put a list of numbers in order from least to greatest.

Kiran

207, 217, 272, 269, 290

Andre

207, 217, 269, 272, 290

Andre disagreed with Kiran, so he used a number line to justify his answer.

Scale 200 to 300., by 10's. 21 evenly spaced tick marks. First tick mark, 200. Last tick mark, 300. Every other tick mark labeled. Points plotted and labeled at 207, 217, 269, 290.

Who do you agree with? Why?

Be prepared to explain your thinking. Use what you know about place value or the number line to justify your reasoning.

Activity 2 Order Numbers

Problem 1

  1. Estimate the location of 839, 765, 788, 815, and 719 on the number line. Mark each number with a point. Label the point with the number it represents.

     Number line. Scale 700 to 850 by tens. First tick mark, 700. Last tick mark, 850.
  2. Order the numbers from least to greatest.

    1. 839

    2. 765

    3. 788

    4. 815

    5. 719

Problem 2

  1. Estimate the location of 199, 245, 173, 218, and 137 on the number line.
    Mark each number with a point.
    Label the point with the number it represents.

     Number line. Scale 100 to 250 by tens. Evenly spaced tick marks. First tick mark, 100. Last tick mark, 250.
  2. Order the numbers from greatest to least.

    1. 99

    2. 245

    3. 173

    4. 218

    5. 137

Problem 3

  1. Order the numbers from least to greatest.

    1. 545

    2. 454

    3. 405

    4. 504

    5. 445

  2. Explain or show your thinking. Use the number line if it helps.

     Number line. Scale 400 to 550 by tens. First tick mark, 400. Last tick mark, 550.

Problem 4

Was it more helpful for you to put the numbers in order first or put them on the number line first? Explain.

Practice Problem

Problem 1

  1. Locate 441, 418, 481, 487, and 429 on a number line. Mark each number with a point. Label each point with the number it represents.

    Number line. Scale 410 to 490 by tens. First tick mark, 410. Last tick mark, 490.
  2. Order the numbers from greatest to least.