Curriculum / Math / 1st Grade / Unit 2: Adding and Subtracting With Story Problems / Lesson 21

Adding and Subtracting With Story Problems

Lesson 21

Math

Unit 2

1st Grade

Lesson 21 of 22

Objective

Determine the unknown number given an equation with and without pictorial representation.

Student-Facing

I can find the missing number in equations.

Lesson Map

Topic A: Add To/Take From with Change Unknown

Lesson

Solve add to story problems with change unknown using objects, pictures, and words.

Standards

1.OA.A.11.OA.B.4

Lesson

Solve add to story problems with change unknown using objects, pictures, and words and write a related equation.

Standards

1.OA.A.11.OA.D.8

Lesson

Solve add to story problems with change or result unknown using objects, pictures, and words and write a related equation.

Standards

1.OA.A.11.OA.D.8

Lesson

Solve take from story problems with change unknown using objects, pictures, and words.

Standards

1.OA.A.11.OA.B.4

Lesson

Solve take from story problems with change unknown using objects, pictures, and words and write a related equation.

Standards

1.OA.A.11.OA.D.8

Lesson

Solve take from story problems with change or result unknown using objects, pictures, and words and write a related equation.

Standards

1.OA.A.11.OA.B.4

Topic B: Put Together/Take Apart with Addend Unknown

Lesson

Use the commutative & associative properties of addition to solve put together/take apart story problems with three addends in more than one way.

Standards

1.OA.A.11.OA.A.21.OA.B.31.OA.C.6

Lesson

Solve put together/take apart story problems about In and Out (Hide and Count) with addend unknown using more than one equation.

Standards

1.OA.A.11.OA.B.41.OA.D.8

Lesson

Solve put together/take apart story problems with addend unknown using objects, pictures, and words and write a related equation.

Standards

1.OA.A.11.OA.B.4

Lesson

Solve put together/take apart story problems with addend, both addends, or total unknown using objects, pictures, and words and write a related equation.

Standards

1.OA.A.11.OA.A.21.OA.D.8

Lesson

Determine if equations are true or false. Match equations to a story problem to determine the unknown.

Standards

1.OA.D.71.OA.D.8

Topic C: Compare with Difference Unknown

Lesson

Compare the quantities in sets to find the difference between them using 1-to-1 correspondence.

Standards

1.OA.A.11.OA.B.4

Lesson

Solve compare story problems with difference unknown using objects, pictures, and words.

Standards

1.OA.A.11.OA.B.4

Lesson

Solve compare story problems and write equations with the Twin Trains game.

Standards

1.OA.A.11.OA.B.4

Lesson

Solve compare story problems with difference unknown using objects, pictures, and words and write a related equation.

Standards

1.OA.A.11.OA.D.8

Lesson

Solve compare story problems with difference unknown using a number path.

Standards

1.OA.A.11.OA.C.5

Lesson

Solve compare story problems with difference unknown using tape diagrams.

Standards

1.OA.A.11.OA.C.5

Topic D: Plenty of Problems (mixed problem types)

Lesson

Determine how different story problem types are alike and different. Match equations to story problems and solve to find the missing number.

Standards

1.OA.A.11.OA.C.61.OA.D.7

Lesson

Determine how different story problem types are alike and different. Match situation and solution equations to story problems and solve to find the missing number.

Standards

1.OA.A.11.OA.C.61.OA.D.7

Lesson

Determine how different story problem types are alike and different. Write two equations to match each story problem and solve for the unknown.

Standards

1.OA.A.11.OA.C.61.OA.D.7

Lesson

Determine the unknown number given an equation with and without pictorial representation.

Standards

1.OA.D.8

Lesson

Determine if equations are true or false. Determine the unknown in equations based on story problems.

Standards

1.OA.D.71.OA.D.8

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