# What’s the Rule - Part 1 - Lesson for Grade 1, Chapter - Thinking Deeper about Addition and Subtraction—The Unknown Number

In "What's the Rule - Part 1," first-grade students will embark on an educational adventure to deepen their understanding of addition and subtraction through exploring the concept of the unknown number. This lesson is nestled within the unit on Applications in Operations Within 100, aiming to develop students' proficiency in mathematical operations and their practical applications.

Throughout the lesson, students will engage in a variety of activities designed to enhance their logical thinking and problem-solving skills. By working with the Addition Robot Sorter Worksheet and the Subtraction Robot Sorter Worksheet, students will learn how to categorize and solve addition and subtraction problems efficiently, recognizing patterns in numbers and operations.

The Function Machines: Find the Rule and Find the Rule Worksheet activities will introduce students to the foundational concept of functions in mathematics. They will discover how to identify the 'rule' that transforms an input number to an output number, thereby unraveling the mystery of the unknown number in an equation.

Understanding these concepts is crucial as it lays the groundwork for more advanced mathematical operations and problem-solving strategies.

Estimated classroom time: 13 min
Unit: Applications in Operations Within 100
Click on any activity below to start learning.
1st
3:00 min
worksheet
2nd
4:00 min
Function Machines: Find the Rule
video
3rd
3:00 min
Find the Rule Worksheet
worksheet
4th
3:00 min
Subtraction Robot Sorter Worksheet
worksheet
Share your lesson with students by clicking:
• ### Activity 1 / Addition Robot Sorter Worksheet

Using this tracing paper worksheet, your child will have a better understanding of the rules of addition. The robots on both sides of the table have the signs +8 and +5. You and your child must figure out which equation completes the data in the each table. Carefully trace on the dotted lines to the correct rule. Help your young ones have a better understanding of math and adding equations with this traceable worksheet.

• ### Activity 3 / Find the Rule Worksheet

In elementary math, a function machine is a diagram that contains an input that applies a math rule, like a set operation of addition or subtraction, to create an output, or the answer. This means that each graph contains various numbers for input and output, but they are tied together by a common rule. Essentially, children are examining the diagram for a common relationship between each input and output value. Use this vivid worksheet to help your child analyze the function machines to find the addition or subtraction rule that is being used for each!

• ### Activity 4 / Subtraction Robot Sorter Worksheet

Finding patterns and looking for relationships between numbers are essential skills for math mastery! Help your child get the practice he or she needs with the assistance of delightful robot friends! Look carefully at each function machine. Is the rule minus 3 or minus 6? For each diagram, see if the relationship between each number can be found using either rule. When the pattern is found, simply trace the dotted line to the side of the robot containing the correct rule!