Math Lesson - Enrichment, Thinking Deeper about Addition and Subtraction—The Unknown Number, Grade 1

In this Enrichment lesson tailored for Grade 1 students, learners will delve into the fascinating world of addition and subtraction, focusing on the concept of "The Unknown Number. " This chapter is part of the unit on Applications in Operations Within 100, providing students with the essential skills to solve mathematical problems within this numerical range. Through engaging activities such as the "Missing 12 Worksheet" and the "Missing Number Word Problems Worksheet," students will be encouraged to think deeper and apply their understanding of addition and subtraction in more complex scenarios.

By participating in these activities, students will learn to identify and solve for unknown numbers in addition and subtraction equations, a fundamental skill in arithmetic that forms the basis for more advanced mathematical concepts. Understanding how to work with unknowns will not only enhance their problem-solving skills but also build a strong foundation for algebraic thinking in later grades. Moreover, this lesson will help students develop critical thinking and reasoning abilities as they explore different strategies to uncover these hidden numbers.

Estimated classroom time: 6 min
Chapter: Thinking Deeper about Addition and Subtraction—The Unknown Number
Unit: Applications in Operations Within 100
Click on any activity below to start learning.
1st
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3:00 min
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Missing 12 Worksheet
Missing 12 Worksheet
worksheet
2nd
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3:00 min
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Missing Number Word Problems Worksheet
Missing Number Word Problems Worksheet
worksheet
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  • Activity 1 / Missing 12 Worksheet

    Help your kids figure out the missing number in this colorful nature worksheet. By engaging your kids in simple and educational exercises such as this one, you combine teaching them with some fun. Help your kids practice their addition and subtraction skills with the simple exercise. Look at the picture with your kids. Which of the equations have 12 as the missing number? Help your kids trace on the dotted lines for the correct answers.

  • Activity 2 / Missing Number Word Problems Worksheet

    Word problems are mathematical problems that come in the form of texts. When your child sees a word problem, they might be confused at first. The key to solving word problems is first reading and understanding them, and then translating the text into an equation. Read the word problems in this worksheet to your students. Help them translate the sentences into a mathematical equation, and then check the equations that match the word problems. Then, circle the correct solutions.