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Functions as Inputs and Outputs

8.F.A.1
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Aligned To Common Core Standard:

Grade 8 Functions - 8.F.A.1

What are Inputs and Outputs of Functions? We all know that plants are the primary source of our oxygen. They take in carbon dioxide and give out oxygen. Just like that, in mathematics, the manufacturing plants are called "Functions." One thing goes in, and another one comes out. Functions exist everywhere and all around us. We eat food, and we get energy. We switch on the TV, and we can watch our favorite channel. We ask somebody a question, and we get an answer. An expression that produces exactly one answer for any given number that we provide the expression with, it is called a function. Input - When we input a number in an expression, it is called an input. Output - The answer we get after the calculations are finished, is called output.

Printable Worksheets And Lessons






Homework Sheets

This is a core skill that students need to master quickly for future material .

  • Homework 1 - Complete the table. f(x) = 3x
  • Homework 2 - The graph of the function is the straight line connecting the pairs.
  • Homework 3 - Choose points to complete the data table.



Practice Worksheets

If students had trouble understanding how to interpret graphs before, this will cure them.

  • Practice 1 - This graph shows how the number of cookies box depends on the number of days that Kenny baked. If Kenny bakes cookies 3 day, how many cookie boxes will be ready?
  • Practice 2 - This graph shows the charging level (%) of a battery decreasing over several hours. How much (%) battery life will remain after 12 hours?
  • Practice 3 - This graph shows the fuel level (%) in a fuel tank over time. What percent (%) of the fuel will remain after 8 hours?



Math Skill Quizzes

You will definitely need some graph paper for these.

  • Quiz 1 - Graph this function.
  • Quiz 2 - Interpret the graphs to answer the questions.
  • Quiz 3 - This graph shows numbers of workers that worked over a 7 day period. How many workers were working on the 3rd day?