Unit 3, Lesson 20
A Trip to the Zoo
Grade 1
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Number Talk
Learn how to use instructional routines to facilitate problem-based learning!
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The purpose of this Number Talk is to elicit strategies and understandings students have for adding within 20.
Students may have many ideas for adding these numbers. In the Synthesis, students discuss what they notice about the first two expressions. Students may notice that the expressions are equal and that one expression might help them with the other.
Find the value of each expression mentally.
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Learn how to use instructional routines to facilitate problem-based learning!
In this activity students solve three-addend story problems within 20. Students use methods and representations that make sense to them. When students connect the quantities in the story to an equation, they reason abstractly and quantitatively (MP2). They think strategically and may either choose to use a double 10-frame or decompose and compose the numbers in a way that helps them see the sum as 10 and some ones (MP1, MP5).
Show your thinking using drawings, numbers, or words.
Jada sees birds at the zoo.
She sees 3 herons, 6 hawks, and 7 hummingbirds.
How many birds does Jada see?
Jada goes to the petting zoo.
She pets 8 goats, 7 sheep, and 4 pigs.
How many animals does Jada pet?
We made a ten to add 3 numbers.
We made a ten to add 2 numbers.
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Jada went to the zoo with her family.
They saw reptiles.
They saw 8 snakes, 7 iguanas, and 5 turtles.
How many reptiles did Jada’s family see?
Show your thinking using drawings, numbers, or words.
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