Input and Output Tables – Find the Rule | Math for 1st Grade

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In today’s lesson, Teacher Michael introduced students to the concept of input and output using robots that follow specific mathematical rules. The “plus two” robot demonstrated how adding two to a number produces an output, while the “subtract four” robot showed how subtracting four can yield different results depending on the input. Students learned the importance of testing multiple inputs to ensure the rules work consistently.
  1. What do we call the number we put into the robot?
  2. Can you think of a number that the “plus two” robot would change? What would it become?
  3. Why is it important to test the rules with different numbers?

Welcome to the Robot Rule Adventure!

Hello, everyone! I’m Teacher Michael, and today we’re going to have some fun with robots in our technology lab. These robots have special rules that help us solve number problems. Are you ready to learn and play with me?

Understanding Input and Output

Imagine a machine where you put something in, and something else comes out. The thing you put in is called the input, and what comes out is the output. Our robots use rules to change the input into the output. Let’s see how this works!

Meet the Plus Two Robot

Our first robot has a rule called “plus two.” This means it adds two to any number you give it. Let’s try it out!

If we put in the number five, what do you think will come out? Let’s see… It’s seven! That’s because five plus two equals seven. Let’s try another number. If we put in three, the output is five. Three plus two is five, so the rule works!

Checking Another Table

Let’s see if the “plus two” rule works for another table. If we put in four, the output should be six, but it’s one. Oops! The rule doesn’t work here because four plus two is six, not one.

Meet the Subtract Four Robot

Now, let’s meet our second robot. Its rule is “subtract four.” Let’s find out which table this rule works for.

First, we try the number six. The output is three, but six minus four is two, so this rule doesn’t work here.

Finding the Right Table

Let’s try another table. If we put in five, the output is one. Five minus four is one, so the rule works! Let’s check one more. If we put in four, the output is zero. Four minus four is zero, so the rule “subtract four” works perfectly with this table!

Conclusion

Thanks for helping me find the rules! Remember, the input is what you start with, and the rule is like a magic trick that changes it into the output. Always test more than one input to make sure the rule works every time. See you next time for more fun learning!

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  • What do you think would happen if we had a robot with a “plus five” rule? Can you think of some numbers to try and what their outputs would be?
  • Have you ever used a machine or toy that changes something, like a robot or a vending machine? What did it do, and how did it work?
  • Can you come up with your own rule for a robot? What would your robot do, and what would be an example of an input and output?
  1. Create Your Own Robot Rule: Imagine you have your own robot with a special rule. What would it be? Maybe it adds three, subtracts one, or even doubles the number! Draw a picture of your robot and write down its rule. Then, pick three numbers to test your rule. What are the outputs? Share your robot and its rule with a friend or family member and see if they can guess the rule based on your examples!

  2. Robot Rule Hunt: Go on a hunt around your home or classroom to find things that follow a rule. For example, if you have a clock, the rule might be “add one” to go from one hour to the next. Can you find other examples where something changes in a predictable way? Draw or write about what you find and explain the rule you discovered.

  3. Input and Output Game: Play a game with a partner where one person thinks of a number and applies a secret rule (like “plus two” or “subtract four”) to it. The other person has to guess the rule by asking for different inputs and seeing the outputs. How many tries does it take to guess the rule? Switch roles and try again!

Sure! Here’s a sanitized version of the YouTube transcript:

[Music][Applause]

Hello, boys and girls! It’s me, Teacher Michael, and I’m here in the technology lab getting some robots ready for an important task. Today, we will work together to complete the “What’s the Rule?” problems.

Okay, the robots are ready! Each of these robots has a rule that works with a set of numbers. This robot has the rule “plus two.”

Look at these charts. The rule works for one of them, but which one? Well, first we have to study the tables. Do you know what input and output mean? Think of it like a machine: if we put something in, that’s the input; output is what comes out of it. We can study the inputs and outputs to try to figure out the rule.

Let’s use the robot to help! Five goes in as the input. Let’s see what the output will be. It’s seven! We already know the rule of this robot is plus two. If five goes in and we add two, does seven come out? Yes! It means that the robot’s rule works here.

Let’s check one more input. Look, input three, and the output is five. Three plus two is also five. This is it! We found the rule. The robot’s rule works for this table.

Will the plus two rule work for the other table? Let’s see. Four goes in, and one should come out. If four goes in and the robot adds two, then six should be the output, not one. So, the plus two rule can’t unlock the equation in this table.

The second robot has a rule: subtract four. Let’s find out which table this rule will work for. The first input is six, and the output is three. Is six minus four equal to three? No, it means that the robot’s rule doesn’t work here.

We have one more table to check. The first input here is five, and the output is one. If five goes in and we take away four, like the rule says, do we get one? Yes, we do! What about the next row? The input is four, and the output is zero. Four take away four is zero, just like the output. Great! The rule “subtract four” works with this table.

Thanks for helping me find the rule! Remember, the input is what goes into the rule, and the rule is the code or operation that helps determine the output. Be sure to test more than one input to make sure the rule still works. See you next time!

[Music]

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This version removes any informal language and maintains a clear and educational tone.

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