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Unit 1 - Lesson 14 - Grade 3: Illustrative Mathematics

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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®
Lesson: Write and Solve Equations with Unknowns

Number Talk: Fives (Warm Up)

Find the value of each expression mentally.
1.

1 x 5

2.

2 x 5

3.

3 x 5

4.

4 x 5

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.
5.

Find the number that makes each equation true.

Rewrite the equation with the solution.

Cool Down: Unknown and a Number
6.

Write an equation to match the diagram. Use a symbol for the unknown.

7.

Find the number that makes the equation true. Rewrite the equation with that number. Explain your reasoning.