# Math Operators

Use mathematical symbols to calculate results.

Grades 8+

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for Middle School Curriculum

**Lesson Plan**

**Lesson: Math Operators**

**Time: 40+ mins**

**Introduction**

In this lesson, students will learn to use Python math operators such as addition, subtraction, and division. Additionally, students will practice writing mathematical expressions throughout the modules.**Vocabulary**

**Operator:**A symbol that modifies or combines values. For example,**+**and**-**are operators that add or subtract values.**Expression:**A sequence of values or variables connected by operators. For example, the expression**b - a + 1**subtracts two variables and then adds the value 1.**Binary Operator:**An operator that only combines two values. Most of the operators that are commonly used in mathematical expressions like / and * are binary operators as the operation only involves the number before and after the operator.**Modulus:**The modulus operator is a binary operator that divides the first number by the second number and returns the remainder from that division operation. If the second number is a factor of the first number, the modulus operator will return 0.**Incrementing:**In programming, incrementing is the process of replacing a variable with the result of an operation and itself that increases the value stored in the variable. For example,**x = x + 1**increments the value stored in x by 1.**Decrementing:**In programming, decrementing is the process of replacing a variable with the result of an operation and itself that decreases the value stored in the variable. For example,**x = x/2**decrements the value stored in x by half of itself.

**Objectives**

Students will...- Write and apply mathematical expressions
- Apply coding concepts to convert integers to floats
- Use the exponent and modulus operators
- Increment and decrement values stored in variables
- Simulate real world mathematical equations with Python

**Materials**

- Computers (1 per student) with student account access to Tynker.com

**Warm-Up** (*5 minutes*)

Ask students to solve the following:**1.**10 + 15 - 1 = ?

**2.**4 / 2 = ?

**3.**5 * 10 / 2 = ?

**4.**(2 + 2) * 10 / 5 = ?

Answers:

**1.**24

**2.**2

**3.**25

**4.**8

**Activities** (*35 minutes*)

Facilitate as students complete the Math Operators modules on their own:**1. Addition and Subtraction (Tutorial)**

- Students will read a short document that explains the addition and subtraction operator in Python.
- Optional: Before students select the “play” button, ask them to write down what they think the code will output.
- Do students need help with the “100th Birthday” puzzle? Give a hint: Tell them use the code listed above as a reference.

**2. Multiplication and Division (Tutorial)**

- Students will read a short document that explains the multiplication and division operator in Python.
- Optional: Ask students, “What is a binary operator?” (An operator that combines two values)
- Optional: Before students select the “play” button, ask them to write down what they think the code will output.
- Do students need help with the “Distance, rate, and time” puzzle? Give a hint: Tell students that they will need to divide by 60.
- Do students need help with the “Troll call” puzzle? Give a hint: Tell students that a troll’s name is “tr” concatenated with “ol” repeated “age” times.

**3. Floats (Tutorial)**

- In this module, students will expand on what they learned in the previous lesson about floats.
- Check that students are using floats in their puzzle solution.

**4. Float Function (Tutorial)**

- Students will read a short document that explains the float function, which returns its argument as a floating point number.
- Are students struggling with the puzzle? Tell students that they will need to convert values between decimal and integer representations. Optional: Tell students to include this in their code: str(int(applicants * percentage / 100.0))

**5. Exponents (Tutorial)**

- In this module, students will learn about exponents and the exponent operator (**).
- Students who are not strong at math are likely to struggle with the “Volume versus surface area” puzzle, so encourage students to brainstorm possible solutions with a partner.

**6. Modulus (Tutorial)**

- In this module, students are introduced to the modulus operator (%), which returns the remainder after dividing the number on the left by the number on the right.
- Optional: Before students select the “play” button, ask them to write down what they think the code will output.
- Are students struggling with the “Variable precision” puzzle? Tell them to use the code in the examples above as a reference.

**7. Order of Operations (Tutorial)**

- In this module, students will read a short document that reviews the order of operations.

**8. Increment and Decrement (Tutorial)**

- Students are introduced to incrementing and decrementing.
- Optional: Before students select the “play” button for the incrementing and decrementing examples, ask them to write down what they think the code will output.
- Say, “When a variable is replaced by a smaller value, the process is called ‘decrementing.’” Emphasize that its previous value is decreasing.
- This module does not contain puzzles.

**9. More on Increment and Decrement (Tutorial)**

- In this module, students will learn how to use incrementing and decrementing with other operators.
- The puzzle solutions in this module requires students to write multiple lines of code, so encourage them to work together as they solve the puzzles.

**10. Fibonacci Sequence (Tutorial)**

- This module introduces students to Fibonacci numbers and the golden ratio.
- Optional: Do a quick Google Images search of “golden ratio in nature” and show your students how mathematically beautiful nature can be!
- Are students are struggling with the puzzle? Give a hint: Tell them to include 7 additional variables to solve the puzzle.

**11. Quiz**

- In this quiz, students will solve 3 different math operators puzzles.
- In each problem, students will need to correctly apply math operators to produce the expected result.

**Discussion Questions/Follow-Up Activities** (*20 minutes*)

- Ask students what they learned about using math operators in Python.
- Who can give an example of a math operator and explain how they applied it in today’s lesson?
- Have students create their own math operator problems and test it out using Python.

**US Standards**

**CCSS-ELA:**SL.8.1, RI.9-10.3, RI.9-10.6, RI.11-12.3, RI.11-12.6, L.9-10.3, L.9-10.6, L.11-12.3, L.11-12.6**CCSS-Math:**HSN.Q.A.1, HSN.Q.A.2, HSN.Q.A.3, MP.1, MP.2, MP.4**CSTA:**2-AP-11, 2-AP-13, 2-AP-17, 3A-AP-17, 3B-AP-11**CS CA:**6-8.AP.11, 6-8.AP.13, 6-8.AP.17, 9-12.AP.12, 9-12.AP.16**ISTE:**1.c, 1.d, 4.d, 5.c, 5.d

###### Math Operators

Python 201###### Lesson Includes

- 11 Activities
- 1 Completion Badge

###### Languages

Python

###### Experience

Advanced