Unit 5, Lesson 12
Order Numbers
Grade 2
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. He used a number line to justify his answer.
Activity 2
Order Numbers
- Estimate the locations of 839, 765, 788, 815, and 719. Mark each number with a point. Label each point with the number it represents.
Order the numbers from least to greatest.
_______, _______, _______, _______, _______
- Estimate the locations of 199, 245, 173, 218, and 137. Mark each number with a point. Label each point with the number it represents.
Order the numbers from greatest to least.
_______, _______, _______, _______, _______
-
Order the numbers from least to greatest.
545, 454, 405, 504, and 445
_______, _______, _______, _______, _______
Show your thinking using the number line.
- Was it more helpful for you to put the numbers in order first or put them on the number line first?
Student Section Summary
We compared 3-digit numbers. We used number lines and base-ten diagrams. We used the value of the digits in base-ten numerals to compare numbers. We explained our thinking.
We learned that diagrams help when comparing numbers. We compared hundreds to hundreds, tens to tens, and ones to ones. We learned that diagrams help with digits too.
The number line shows the numbers in order. We can tell which number is greater using its location on the number line.
We wrote expressions using the
432 is greater than 423
423 is less than 432
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