## 1.OA.A.2

## Solve word problems that call for addition of three whole numbers whose sum is less than or equal to 20, e.g., by using objects, drawings, and equations with a symbol for the unknown number to represent the problem.

14 Lesson(s)

#### Using the theme of a very YUMMY Thanksgiving meal, students will plan their own meal and figure out the cost of it.

#### Incorporate both 1.OA.1's Make 10 strategy focus AND 1.OA.A.2's focus on adding 3 addends as students work to solve word problems.

#### Students work to solve multiple 3 part number sentences and determine if they are equal or not! Students practice using less than, equal to and greater than language!

#### Following multi-step directions is a difficult task for first graders. This lesson will allow additional practice to solve word problems. I want them to pick the strategy that works best for them to join three numbers.

#### Old McDonald had a farm and all of his animals came out to play. How many animals are there in all? Today the students will find out!

#### Following multi-step directions is a difficult task for first graders. This introductory lesson will teach them how to bring a word problem to life and help them visualize what needs to be done to solve by joining three numbers.

#### Let’s put it all together! In this lesson students will use addition strategies to solve word problems.

#### Students apply known facts to help them add 3 numbers together in this game oriented lesson!

#### My students have worked on joining 3 addends using drawings, objects, and equations. This lesson will supply concentrated practice on solving 3 addend equations with sums less than or equal to 20.

#### Introduce students to the concept of "simplifying" as they find the friendly number sentences that help them solve 3 addend number sentences!

#### Connect to a classic children's story and extend student thinking! Students apply their understanding of 3 addend equations to solve for the missing part of a story problem.

Big Idea: