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- 1.OA.D.7Understand the meaning of the equal sign, and determine if equations involving addition and subtraction are true or false. For example, which of the following equations are true and which are false? 6 = 6, 7 = 8 - 1, 5 + 2 = 2 + 5, 4 + 1 = 5 + 2.
- 1.OA.D.8Determine the unknown whole number in an addition or subtraction equation relating three whole numbers. For example, determine the unknown number that makes the equation true in each of the equations 8 + ? = 11, 5 = _ - 3, 6 + 6 = _.

Finding the Hidden Addend

1st Grade Math

Â» Unit:

Working with Numbers, Operations, and Story Problems

Big Idea:CSI First Grade! Today your young investigators will try to find the missing addend while playing two different missing addend games.

Missing Numbers

1st Grade Math

Â» Unit:

Single Digit Addition and Subtraction

Big Idea:What's missing? In this lesson students will learn to find the missing number in a given math sentence.

Seven Apples and Bananas

1st Grade Math

Â» Unit:

Building Numbers

Big Idea:Possibilities are abound as students try to determine one of the possible solutions to a story problem. Although they won't be eating Apples and Bananas, Raffi would still be proud.

If you give a mouse a cookie...

1st Grade Math

Â» Unit:

Missing Parts: Unknowns in All Positions

Big Idea:Who doesn't love Laura Numeroff''s If You Give a Mouse a Cookie?! Connect to that well loved story and play a cookie themed game to practice start unknown subtraction problems.

Using 3 or More Addends to Make a Meal

1st Grade Math

Â» Unit:

Problem Solving Addition

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

Cookie Mysteries

1st Grade Math

Â» Unit:

Missing Parts: Unknowns in All Positions

Big Idea:I use the element of mystery to get kids excited to figure out how many cookies I have to start with!

Identify Related Facts - Day 2 of 2

1st Grade Math

Â» Unit:

Single Digit Addition and Subtraction

Big Idea:It's all in the family! In this lesson, students will build fact family "houses" by using 3 numbers and writing the related addition and subtraction sentences.

Balancing Act

1st Grade Math

Â» Unit:

Missing Parts: Unknowns in All Positions

Big Idea:Incorporate technology in this lesson! Students practice balancing equations and apply their understanding of missing parts.

Counting On

1st Grade Math

Â» Unit:

Problem Solving Addition

Big Idea:Students understand counting on, but when we record our thinking do we have to record all. Of course not! This lesson is designed to get students to count on not all.

Combinations, Day 1

1st Grade Math

Â» Unit:

Working with Numbers, Operations, and Story Problems

Big Idea:Explorations of combinations! Two missing addend games and a story problem, focusing on finding combinations of 9, what else could a 1st grade teacher want.

The Circus Problem

1st Grade Math

Â» Unit:

Missing Parts: Unknowns in All Positions

Big Idea:Students connect to stories! In this lesson students work to solve a sad clown's problem by solving a start unknown story problem!

Unknown Addends

1st Grade Math

Â» Unit:

Addition Strategies

Big Idea:My First Graders have been studying many addition strategies. Now I want them to use these strategies to determine an unknown number in an addition equation.

Bicycle Shop Orders

1st Grade Math

Â» Unit:

Missing Parts: Unknowns in All Positions

Big Idea:Incorporate dramatic play into your math block with this imaginative lesson! Students pretend they are taking orders in a bike shop-with each problem they have another missing part to find!

Pick a Card, Any Card!

1st Grade Math

Â» Unit:

Missing Parts: Unknowns in All Positions

Big Idea:It may not be Vegas, but this game will have kids thinking! Students use their understanding of missing parts to figure out if a number would fit any of their equations.

Is It True or Is It False?

1st Grade Math

Â» Unit:

The Number 10 and the Addition and Subtraction Concept

Big Idea:Understanding the meaning of the equal sign and finding missing addends to make equations true are the big ideas today. Students engage in conversation and activities to discuss their understanding and thinking.

1.OA.D.7

Understand the meaning of the equal sign, and determine if equations involving addition and subtraction are true or false. For example, which of the following equations are true and which are false? 6 = 6, 7 = 8 - 1, 5 + 2 = 2 + 5, 4 + 1 = 5 + 2.

1.OA.D.8

Determine the unknown whole number in an addition or subtraction equation relating three whole numbers. For example, determine the unknown number that makes the equation true in each of the equations 8 + ? = 11, 5 = _ - 3, 6 + 6 = _.