# Lesson: Input/Output Tables: Completing the Table

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### Lesson Objective

SWBAT use a rule to complete an input/output table.

### Lesson Plan

Materials Needed: white board, dry erase markers, DN worksheet, Example Problem, scrap paper, pencils, GP worksheet, IND practice worksheet
Vocabulary: input, output, numerical relationship, solve, equations

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Do Now (2 - 3 min): Teacher gives each student a copy of the DN worksheet. Students should complete the worksheet quickly and quietly.

Opening (2 -3 min): Teacher reviews the answers to the DN worksheet. Teacher says, “Yesterday, we learned how to find the rule when looking at an input/output table. Today, we are going to continue talking about input/output tables. By the end of the lesson, you will be able to use a rule to complete an input/output table on your own.”

Direct Instruction (10 - 12 min): Teacher posts the Example Problem on the board and says, “When we look at this problem, we should be reminded about what we learned yesterday when we were determining the rule. I want you all to quickly pull out a piece of scratch paper and see if you can figure out what the rule is with this number machine. Ok, does anyone have a rule? [Answers will vary, teacher is looking for multiply by 2, then add 4 to the answer] Very good, some of you figured out that we need to multiply by 2 and then add 4 to the answer. That is the rule for this input/output table. Now that we know the rule, we need to understand how to use the rule. We need to be able to complete the input/output table using the rule.”

Teacher points to the first row of the table and says, “If I put 8 into the number machine, I would multiply 8 by 2 to get 16 and then add 4 to get 20.” Teacher writes 8x2=16+4=20 on the board and says, “Really, you just have to follow the rule. If you use the rule, then you can solve the problem in order to get the output of any number. Lets practice with the next number in our example. I have the number 5, what is the first thing I will do to this 5 based on the rule? [Multiply it by 2] Right, and 5x2 is 10, and then what do I do? [Add 4] Right, and 10 + 4 is 14. So if I put 5 into the number machine and follow the rule, I will get an output of 14. Lets look at the last row in our example; can anyone use their scratch paper or their mental math skills and tell me what the output will be if the input is 12? [26] Awesome, the answer would be 26. You all are ready to practice following the rules and complete an input/output table in small groups!”

Guided Practice (10 -12 min): Teacher gives each math group a GP worksheet and circulates the room to answer any questions. When most students are finished, the teacher reviews the answers and clarifies any points of confusion.

Independent Practice (10 min): The teacher hands out the IND Practice worksheet. Students are asked to complete the worksheet independently and turn it in.

Closing (2-3 min): Teacher calls the attention of the students back toward the front of the class to quickly review the answers to the Independent Practice worksheet/ ask what we learned about.

### Lesson Resources

 IND lesson 13   Classwork GP lesson 13   Classwork 2 EX lesson 13   Exemplar DN lesson 13   Starter / Do Now