# Using Unknown addend problems to help with Subtraction Part 2 - Lesson for Grade 1, Chapter - Thinking Deeper about Addition and Subtraction—The Unknown Number

In "Using Unknown Addend Problems to Help With Subtraction Part 2," Grade 1 students will delve deeper into the intriguing world of subtraction and addition through the lens of unknown addend problems. This lesson, nestled within the larger context of thinking critically about addition and subtraction and its applications in operations within 100, provides an engaging and foundational understanding that extends beyond mere arithmetic.

Students will engage in a variety of activities such as the "Missing Number: Monster Math Worksheet," which introduces them to the concept of finding missing numbers in a fun, interactive way. The "Solving Problems with Flags of the World Worksheet" broadens their horizon by connecting math to geography, enhancing their problem-solving skills in a global context. Through the "Turn It Down! Subtracting Sounds Worksheet," learners will explore subtraction in everyday situations, making the abstract concept more concrete and relatable. Lastly, "Using Unknown Addend Problems to Help With Subtraction" activities are designed to solidify their understanding by presenting subtraction problems in a format that encourages critical thinking and logical reasoning.

Understanding how to solve unknown addend problems is crucial, as it lays the groundwork for mastering subtraction and addition.

Estimated classroom time: 13 min
Unit: Applications in Operations Within 100
Click on any activity below to start learning.
1st
3:00 min
Missing Number: Monster Math Worksheet
worksheet
2nd
3:00 min
Solving Problems with Flags of the World Worksheet
worksheet
3rd
3:00 min
Turn It down! Subtracting Sounds Worksheet
worksheet
4th
4:00 min
Using Unknown Addend Problems to Help With Subtraction
Quiz
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• ### Activity 1 / Missing Number: Monster Math Worksheet

Monsters, maths and fun has a nice ring to it, don’t you think? The worksheet requires your child use their counting, addition and subtraction skills. There are equations on both sides of the page. The equation on the left is an addition problem, while the equation on the left mirrors the equation in the subtraction form. Help your child figure out which number out of the options provided makes both the equations true.

• ### Activity 2 / Solving Problems with Flags of the World Worksheet

In the world, there are many different countries. Some of these countries are very far away from each other, while some are very close to each other, and even share some areas of land. Ask your kids if they can name some of the countries they are familiar with. Now, introduce them to the flags of these countries using this simple worksheet. Help them find the missing number in each addition problem, and then check the correct answer.

• ### Activity 3 / Turn It down! Subtracting Sounds Worksheet

If your kids are struggling with mathematics in school, or you just feel like they could really use some extra help with their subtraction skills, then this worksheet is just what you need. The math problems your kids face in school will not be enough to help them fully understand mathematics. With some one-on-one time with you, they will enjoy the subject even more. In this worksheet, your kids will need to find the missing number in all the questions. Help them check the correct answer.

• ### Activity 4 / Using Unknown Addend Problems to Help With Subtraction - Quiz

In this assessment students will apply what they know about the part, part, whole structure of addition and subtraction number sentences to solve missing number problems.