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Unknown Addend

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Lesson Plans and Worksheets for Kindergarten
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Eureka Math/EngageNY Kindergarten, module 4, lesson 18 Common Core Worksheets

New York State Common Core Math Kindergarten, module 4, lesson 18
Worksheets for Kindergarten, module 4, lesson 18

Worksheets, solutions, and videos to help Kindergarten students learn how to solve both addends unknown word problems to 8 to find addition patterns in number pairs.

Topic C: Addition with Totals of 6, 7, and 8

Lesson 18 Concept Development and Problem Set

Sam brought 8 pieces of fruit at the farmer’s market. He loves apples and oranges, so he bought some of each. Draw a plate and show his fruit on the plate. Don’t lose any!
Show your work to your friend. Does her plate look the same? Can you make a number bond and number sentence about your picture?

Devin has 6 Spiderman pencils. He put some in his desk and the rest in his pencil box. Write a number sentence to show how many pencils Devin might have in his desk and pencil box.

Shania made 7 necklaces. She wore some of the necklaces and put the rest in her jewelry box. Use the linking cubes to help you think about how many necklaces Shania might have on and how many are in her jewelry box. Then, complete the number sentences.

Tommy planted 8 flowers. He planted some in his garden and some in flowerpots. Draw how Tommy may have planted the flowers. Fill in the number sentences to match your picture.

Create your own story and draw a picture. Fill in the number sentences. Tell your story to a friend.

1. Talk about the pencils on your paper. Did you and your neighbor put the same amount in the desk and the pencil box?
2. How did the cubes help you to think about Shania’s necklaces?
3. What was the difference between the two types of number sentences we made for each picture on the board?
4. When we were drawing our jellybean number sentences, did it matter which color we wrote about first?
5. Could different pictures about the 8 jelly beans still be true? Why?
6. Let’s put our muddy ball number sentences and pictures in order. I’ll put the first ones, 7 = 1 + 6. Next comes 7 = 2 + 5 (move the cards). Talk to your partner, which number sentence will come next in our pattern?
7. Talk to your partner. What patterns do you notice?
8. What was the same about all of our problems today? (There was more than one way to solve and write the problem.)

Lesson 18 Homework

Ted has 7 toy cars. Color some cars red and the rest blue. Write a number sentence that shows how many are red and how many are blue.

Chuck has 8 balls. Some are red and the rest are blue. Color to show Chuck’s balls. Fill in the number sentences.



Learning Goal

I can tell about unknown addends if I know the total amount.



Rotate to landscape screen format on a mobile phone or small tablet to use the Mathway widget, a free math problem solver that answers your questions with step-by-step explanations.


You can use the free Mathway calculator and problem solver below to practice Algebra or other math topics. Try the given examples, or type in your own problem and check your answer with the step-by-step explanations.


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