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Unit 1 - Lesson 14 - Grade 3: Illustrative Mathematics
By Formative Library
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Instructions
Lesson: Write and Solve Equations with Unknowns
Cool Down: Unknown and a Number
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Grade 3 Unit 1
Lesson 14: Write and Solve Equations with Unknowns
CC BY 2021 Illustrative Mathematics®
Grade 3 Unit 1
Lesson 14: Write and Solve Equations with Unknowns
CC BY 2021 Illustrative Mathematics®
Number Talk: Fives (Warm Up)
Find the value of each expression mentally.
1
Question 1
1.
1 x 5
1
Question 2
2.
2 x 5
1
Question 3
3.
3 x 5
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Card Sort: Unknown Numbers
Your teacher will give you a set of cards. Match each equation with a situation or diagram.
Write Equations with an Unknown Number
Directions:
Write an equation to represent each diagram or situation. Use a symbol for the unknown. Be prepared to share your reasoning.
Find the number that makes each equation true. Rewrite the equation with the solution.
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Question 5
5.
Find the number that makes each equation true.
Rewrite the equation with the solution.
visibility
View drawing
Question 6
6.
Write an equation to match the diagram. Use a symbol for the unknown.
Question 7
7.
Find the number that makes the equation true. Rewrite the equation with that number. Explain your reasoning.
Question 4
4.
4 x 5