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Add To with Change Unknown Problems

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Lesson Plans and Worksheets for Grade 1
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Common Core For Grade 1

Eureka Math/EngageNY grade 1 module 2 lesson 23 Worksheets

New York State Common Core Math Grade 1 Module 2, Lesson 23
Eureka Math grade 1 module 2 lesson 23 Worksheets (pdf)

Worksheets, solutions, and videos to help Grade 1 students learn how to solve add to with change unknown problems, relating varied addition and subtraction strategies.

Common Core Standards: 1.OA.1, 1.OA.3, 1.OA.4, 1.OA.6, 1.OA.5, 1.OA.7. 1.OA.8

Lesson 23 Concept Development

Learning goal: I can solve for the unknown by using addition and subtraction strategies.
Lesson 23 Application Problem

In the morning, there were 8 leaves on the floor under the ficus tree. During the day, more leaves fell on the floor. Now there are 13 leaves on the floor. How many leaves fell during the day?

Lesson 23 Exit Ticket

Read the word problem.
Draw and label.
Write a number sentence and a statement that matches the story.

Shanika ate 7 mini-pretzels in the morning. She ate the rest of her mini-pretzels in
the afternoon. She ate 13 mini-pretzels altogether that day. How many mini-pretzels
did Shanika eat in the afternoon? Lesson 23 Homework

1. Micah collected 9 pinecones on Friday and some more on Saturday. Micah collected a total of 14 pinecones. How many pinecones did Micah collect on Saturday?
2. Giana bought 8 star stickers to add to her collection. Now she has 17 stickers in all. How many stickers did Giana have at first?
3. Samil counted 5 pigeons on the street. Some more pigeons came. There were 13 pigeons in all. How many pigeons came?
4. Claire had some eggs in the fridge. She bought a dozen more eggs. Now she has 18 eggs in all. How many eggs did Claire have in the fridge at first?

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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