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Unit 7 - Lesson 1 - Grade 2: Illustrative Mathematics

Last updated 9 months ago
27 questions
Note from the author:
Grade 2 Unit 7
Lesson 1: Compare, Count on, and Count Back
CC BY 2021 Illustrative Mathematics®
Grade 2 Unit 7
Lesson 1: Compare, Count on, and Count Back
CC BY 2021 Illustrative Mathematics®
Lesson: Compare, Count on, and Count Back

Number Talk: Count Back (Warm Up)

Find the value of each expression mentally.
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1

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1

Notice the Difference

Tyler and Elena were asked to find the value of 81 - 79. Their work is shown.

1

What do you notice?

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What do you wonder?

1

Locate and label 203 and 198 on the number line.

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Compare using >, <, or =.

203__________198
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Find the value of 203 - 198.
Show your thinking.

1

Locate and label 673 and 680 on the number line.

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Compare using >, <, or =.

673__________680
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Find the value of 680 - 673. Show your thinking.

1

Locate and label 501 and 499 on the number line.

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Find the value of 501 - 499.
Show your thinking.

1

Find the value of 400 - 396.
Show your thinking.

What’s the Big Difference?

1

Fill in the missing numbers.

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Does this number line show counting on by 10 or counting on by 100?

0

Fill in the missing numbers.

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Does this number line show counting on by 10 or counting on by 100?

1

Fill in the missing numbers.

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Does this number line show counting on by 10 or counting on by 100?

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Fill in the missing numbers to show counting on by 10.

739, 749, _______, 769, _______
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Explain how you can tell your numbers show counting on by 10 and not counting on by 100.

Cool Down: Subtract and Count
1

Locate and label 562 and 559 on the number line.

1

Find the value of 562 - 559.
Show your thinking.

1
Complete the list of numbers to show counting on by 100.

552, _______, _______, 852, 952
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Explain how you know your list shows counting on by 100 and not counting on by 10.