Curriculum Resources

Take learning to the next level and transform the way you teach with a vast library of ready-to-use, standards-aligned, adaptable curriculum resources.
The resources listed below are either available with an Online Learning Subscription which allows you to instruct, assess and track student performance or as individual hands-on classroom resources which can be purchased. Choose from Multimedia Lessons, Curriculum Mastery Games, Flip Charts, Visual Learning Guides, Flash Cards, Vocabulary Cards,
and Curriculum Modules available on our online store. PREMIUM ONLINE LEARNING SUBSCRIPTION OPTIONS

- Select By Standard
- CURRICULUM RESOURCES
- General Science
- Life Science / Biology
- Human Body
- Earth Science
- Physical Science
- Chemistry
- Math
- Language Arts
- Social Studies

- Home
- >Curriculum Resources
- >Third Grade Mathematics resources
- >
# Open Number Sentences Topic

Back

Practice and review the topic selected with illustrated flash cards!

Assess students’ understanding of the topic selected!

Print illustrated worksheets!

Engage students with interactive games.

❮

1

/

2

❯

OPEN NUMBER SENTENCES What Are Open Number Sentences? • Open number sentences are equations that give one part of the equation along with the answer. • In order to solve an open number sentence, the inverse operation is used. How to solve open number sentences: • When solving an open number sentence, first look at the operation that is being used in the number sentence. The inverse operation will need to be used. • If it is an addition problem, you will need to use subtraction. For example: Solve 5 + ___ = 7. To find the missing part of the equation, you will need to subtract 5 from both sides. 5 + ___ = 7 -5 -5 By subtracting 5 from both sides, we find that the answer is 2! 5 + 2 = 7 • If it is a subtraction problem, you will need to use addition. For example: Solve ___ – 8 = 4 To find the missing part of the equation, you will need to add 8 to both sides. – 8 = 4 +8 +8 By adding 8 to both sides, you see the answer is 12! 12 – 8 = 4 © Copyright NewPath Learning. All Rights Reserved. Permission is granted for the purchaser to print copies for non-commercial educational purposes only. Visit us at www.NewPathLearning.com.

Try This! Fill in the correct answer for each open number sentence. 8 + ___ = 13 ___ - 3 = 11 3 + ___ = 15 ___ - 5 = 15 ___ + 17 = 22 ___ - 4 = 18 © Copyright NewPath Learning. All Rights Reserved. Permission is granted for the purchaser to print copies for non-commercial educational purposes only. Visit us at www.NewPathLearning.com.