Function Machines and Rules

This video tutorial introduces first graders to the concept of a function machine in math. It explains how numbers are input into the machine, transformed by a rule, and then output as different numbers. The tutorial covers both addition and subtraction rules, demonstrating how to determine the rule by observing the input and output numbers. It also introduces a reverse process where students must deduce the input number given the output and the rule. The video uses songs and interactive examples to engage students and reinforce learning.

What is the main purpose of a function machine in math?

• To subtract numbers

• To multiply numbers

• To transform inputs into outputs based on a rule

• To add numbers

In the first example, what is the rule that transforms the input 1 to the output 3?

• Add 1

• Multiply by 3

• Add 2

• Subtract 1

What happens to the number when it goes through the function machine in the second example?

• It gets smaller

• It stays the same

• It gets bigger

• It disappears

If the rule is to add 2, what will be the output if the input is 2?

• 5

• 4

• 3

• 2

In the minus rule example, what is the rule that transforms the input 2 to the output 1?

• Subtract 1

• Add 1

• Multiply by 2

• Divide by 2

What is the rule for the function machine when the input is 4 and the output is 3?

• Add 1

• Subtract 1

• Multiply by 3

• Divide by 3

How do you determine the input if the output is given and the rule is to subtract 1?

• Add 1 to the output

• Divide the output by 2

• Multiply the output by 2

• Subtract 1 from the output