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K-5 Grade 2 Unit 7 Lesson 1

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•K-5 Math 6-8 Math 9-12 Math

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Kindergarten Grade 1 •Grade 2 Grade 3 Grade 4 Grade 5

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Lesson 1

Warm-up Activity 1 Activity 2

Unit 7, Lesson 1

Compare, Count On, and Count Back

Grade 2

Warm-up

Find the value of each expression mentally.

Activity 1

Tyler and Elena find the value of .

Tyler

Base ten diagram. 7 tens, crossed out. 11 ones, 9 crossed out.

Elena

Number line. Scale 75 to 85. 11 evenly spaced tick marks. First tick mark, 75. Sixth tick mark, 80. Eleventh tick mark, 85. Arrow from a point at the fifth tick mark to 80, and arrow from 80 to a point at the seventh tick mark.

What do you notice? What do you wonder?

Students playing card game.

Locate and label 203 and 198.

Compare, using , , or .

Find the value of . Show your thinking, using drawings, numbers, or words.
Locate and label 673 and 680.

Compare, using , , or .

Find the value of . Show your thinking, using drawings, numbers, or words.
Locate and label 501 and 499.

Find the value of . Show your thinking, using drawings, numbers, or words.
Find the value of . Show your thinking, using drawings, numbers, or words.

Activity 2

Number line. Five tick marks. Arrows from 234 to 334, from 334 to 434, from 434 to question mark, from question mark to question mark.

Fill in the missing numbers.

Number line. 5 evenly spaced tick marks. First tick mark, 502. Second tick mark, labeled blank. Third tick mark, 702. Fourth tick mark, labeled blank. Last tick mark, 902.

Does this number line show counting on by tens or counting on by hundreds?
Fill in the missing numbers.

Does this number line show counting on by tens or counting on by hundreds?
Fill in the missing numbers.

Number line. 5 evenly spaced tick marks. First tick mark, labeled 278. Second tick mark, labeled blank. Third tick mark, labeled 478. Fourth tick mark, labeled 578. Last tick mark, labeled blank.

Does this number line show counting on by tens or counting on by hundreds?
Fill in the missing numbers, counting on by tens.

739, 749, __________, 769, __________
Explain how you know your numbers show counting on by tens and not counting on by hundreds.