Integers Part 2
Summary
Materials
Instructional Activities and Classroom Assessments
- Integers Review (5 minutes)
- Modify Temperature Converter (5 minutes)
- Create a 20% Tip App (15 minutes)
- Introduction to Expressions (5 minutes)
- Modulus Operator (5 minutes)
- Military Time Converter (15 minutes)
- Reflection/Homework
Learning Objectives
- CRD-2.B Explain how a program or code segment functions. 4.A
- CRD-2.G Describe the purpose of a code segment or program by writing documentation. 4.A
- AAP-1.A Represent a value with a variable. 3.A
- AAP-2.C Evaluate expressions that use arithmetic operators. 4.B
- AAP-2.A Express an algorithm that uses sequencing without using a programming language. 2.A AAP-1.B Determine the value of a variable as a result of an assignment. 4.B
Essential Knowledge
- CRD-2.A.1 The purpose of computing innovations is to solve problems or to pursue interests through creative expression.
- CRD-2.B.2 A code segment is a collection of program statements that is part of a program.
- CRD-2.G.3 Programmers should document a program throughout its development.
- AAP-1.A.1 A variable is an abstraction inside a program that can hold a value. Each variable has associated data storage that represents one value at a time, but that value can be a list or other collection that in turn contains multiple values.
- AAP-1.A.2 Using meaningful variable names helps with the readability of program code and understanding of what values are represented by the variables.
- AAP-1.B.1 The assignment operator allows a program to change the value represented by a variable.
- AAP-1.B.2 The exam reference sheet provides the ” ” operator to use for assignment. For example, Text: a expression Block: a expression evaluates expression and then assigns a copy of the result to the variable a.
- AAP-1.B.3 The value stored in a variable will be the most recent value assigned. For example: ab a1 a2 display(b) still displays 1.
- AAP-2.C.1 Arithmetic operators are part of most programming languages and include addition, subtraction, multiplication, division, and modulus operators.
- AAP-2.C.2 The exam reference sheet provides a MOD b, which evaluates to the remainder when a is divided by b. Assume that a is an integer greater than or equal to 0 and b is an integer greater than 0. For example, 17 MOD 5 evaluates to 2.
- AAP-2.C.3 The exam reference sheet provides the arithmetic operators + - / , , , , and MOD. Text and Block: § a + b § a – b § a b § a / b § a MOD b These are used to perform arithmetic on a and b. For example, 17 / 5 evaluates to 3.4.
- AAP-2.C.4 The order of operations used in mathematics applies when evaluating expressions. The MOD operator has the same precedence as the * and / operators.
- AAP-2.A.2 Beyond visual and textual programming languages, algorithms can be expressed in a variety of ways, such as natural language, diagrams, and pseudocode.
Details
1. Integers review (5 minutes)
- Discuss yesterday's reflection/homework questions with students.
- In JavaScript, what is the resulting value of answer = 5+3*2? Explain why the answer is not 30:
- 11, order of operations
- How is putting operators and numbers into a calculator different than writing code?
- What Math Operators did you research?
- What did you learn about variables, data types, strings, and join?
2. Modify temperature converter (5 minutes)
- Task students to improve their temperature converter to seek user input.
- Show them where to find the ask for number block.
- Let them explore how to integrate it into their program to seek user input.
3. Create a 20% Tip App (15 minutes)
- Task students with creating an app that calculates a 20% tip when they go to a restaurant:
- Include user input
- Include calculation
- Include output
- Encourage them to write pseudocode first.
- When they are finished, students must complete the tasks on the My 20% Tip App page.
4. Introduction to expressions (5 minutes)
- Task students with trading the code of a program to determine what it will do.
- Explain what expressions are and how they relate to integer variables.
- Explain that expressions that are longer than two items will follow the order of operations used in mathematics.
- Remind students of the order of operations in mathematics:
- PEMDAS
5. Modulus operator (5 minutes)
- Explain what the modulus operator is.
- Guide students through the process of using JavaScript (or Python) in MakeCode Arcade to see how Modulus works with numbers.
- Once students create their program, encourage them to enter different numbers to see the results.
5. Military Time Converter (15 minutes)
- Explain that programs that convert military time to standard time use modulus.
- Explain how military time works.
- Task students to work in pairs to create a program that converts military time to standard time:
- Include user input
- Conversion for military time to standard time, including a.m. and p.m.
- Include output
- Encourage them to write pseudocode first.
- When they are finished, students must complete the tasks on the Military Time Converter page.
6. Reflection/Homework
(If you run out of time, you may also assign this as individual homework.) Students should complete their reflection in their OneNote.
- How is working with integers different that working with sprites?
- Did you use any of the Math blocks you researched?
- Note: You could also create an assignment through AP Classroom or Delta Math to practice concepts related to MOD.