Intro to Programming with Karel
offline
Introduction to Programming with Karel
This offline lesson plan introduces students to the fundamentals of computer science
and programming. The lesson plan consists of five parts, each covering a specific
topic. The entire five-part Introduction to Programming with Karel is designed to run
approximately one hour.
Parts 1 and 2 present a broad overview of computing and programming. These lessons
include discussion material, vocabulary, and questions. After completing these
sections, students will be prepared to write their own programs. Part 3 details two
coding activities for the class to complete together, while Part 4 gives students the
chance to write their own programs and try them out with other students. Part 5 wraps
up the lesson with a brief review.
What Youll Need
Photocopies of the Karel world template sheets for students to use.
(Optional) If youd like to have a life-sized version of Karels world:
a stuffed animal or other toy for Karel
a stack of blank paper to use as spots in Karels grid world
some tennis balls or other objects for Karel to pick up and put down
10 min
PART 1: What is Programming?
TOPIC
VOCABULARY
Computers are all around us. Theyre in our
phones, cars, microwaves everywhere! But
- Code: Code is the name for the
instructions you write to a computer in a
computers by themselves are not very useful.
program.
Computers need to be told exactly what tasks to
calculations, stores data, and executes
perform. These instructions are called programs.
Programs are like lists of instructions that we give
to a computer. The better we are at making these
instructions, the better the programs we can make!
- Computer: A person or device that makes
instructions according to a program.
- Computer program: A list of code
instructions a computer follows in order to
perform a task.
- Computing: Executing instructions,
calculating, or using a computer.
Instead of writing out computer instructions in a
language like English or Spanish, we write
programs in code.
DISCUSSION
We use lists of instructions all the time! Ask the
students when they might have used or followed
a list of instructions.
Some examples are:
-Driving directions, color by number activities,
doing laundry, building a toy model or Lego set,
following a recipe, learning a new dance
You can think of these instructions as programs
that we follow.
QUESTIONS
- What is programming?
- What is a computer? What are they used
for? How are humans like a computer?
- How are instructions used to execute
simple tasks?
10 min
PART 2: Programming with Karel the Dog
TOPIC
VOCABULARY
Giving commands to a dog is similar to giving
commands to a computer. Well practice with Karel
the Dog! We can write out lists of instructions, or
programs, for Karel to follow.
Karel only knows a few basic commands:
-move: move forward one spot
-Command: A command is an instruction
you can give to Karel.
- Grid world: A "world" or "Karel World" is a
grid that Karel lives in. It is made up of
streets and avenues (rows and columns).
- Karel: Karel is a dog who listens to your
commands.
-turn left: turns Karel 90 degrees counter clockwise
-put ball: put down a tennis ball
-take ball: pick up a tennis ball
QUESTIONS
DISCUSSION
- What are Karels four basic commands?
- In what kind of world does Karel the
dog live?
Introduce students to Karels grid world.
- What is a computer program? How is
writing computer programs like giving
Karel the dog lives in a small grid world. The
commands to Karel the dog?
world has streets (or, rows) and avenues (or,
columns). Karel can move around this world and
put down tennis balls. But watch out -- Karel
doesnt want to crash into the wall!
Go over Karels basic commands with the
students. It could be helpful to write these commands where the students can see them. Once
students are comfortable with Karels world and
commands, move onto the next lesson.
Page 2
Karel in the grid world
Tennis Ball
Walls
3rd street
2nd avenue
3
2
1
1
Page 3
PART 3: Class Activity: Coding with Karel Commands
20 min
TOPIC
Now that students have learned the basics, its time
to put them into practice! This classroom activity
will give the class a chance to solve some puzzles
with Karel.
The rst puzzle has Karel move to a tennis ball and
pick it up. The second is slightly more challenging
-- Karel will put down tennis balls in two different
corners, then nish by moving to a third corner.
SETUP
Photocopy and cut out the included grid world,
Karel, and tennis ball templates. Use these to set
up your paper grid world to look like the world in
the Before picture. The goal is to write a set of
commands to get Karel to achieve the result
world.
If you have a large table or space on the oor, you
can make a life-size grid world using blank
sheets of paper for each grid world spot, a stuffed
animal or other prop for Karel, and tennis balls or
similar objects for Karel to pick up and put down.
Page 4
1. Your First Karel Program
DISCUSSION
SOLUTION
Review Karels basic commands with the students.
Even though these commands are quite simple,
Karel can use them to solve some pretty tricky
puzzles!
move
move
move
take ball
EXERCISE
Set up your grid world (using either paper on the
oor or table, or with one of the provided grid
world) to match the Before world:
- place the Karel toy in the bottom left corner
- place the tennis ball in the bottom right corner
- using only Karels basic commands, get Karel to
QUESTIONS
- What are Karels four basic commands?
- What happens if you go through the
move over the ball and take it
program backwards, from the bottom of
Have students call out the necessary Karel com-
line to line?
the list up? Or if you jump randomly from
mands. Write these commands out on the board
or one of the provided code editor sheets so
that it is a list of commands. Each Karel command
should go on its own line, like items in a list. Karel
will read these commands from top to bottom.
Once you have a completed program, walk Karel
through the list of commands step by step to
ensure that Karel achieves the correct result
world.
Page 5
BEFORE
AFTER
BEFORE
AFTER
Page 6
2. Moving and Turning
DISCUSSION
SOLUTION
Now try a more difcult program. In this one, Karel needs
to put down a ball in the bottom left corner, then move
up to the top left and put down another ball, then move
to the top right. This means Karel will need to make a
right turn. But wait, turn right is not one of Karels
commands! How can we get Karel to turn right? Ask
students to think about how Karel can turn right using
only the same four basic commands.
Turning right is the same as turning left three times:
1. turn left
2. turn left
3. turn left
put ball
turn left
move
move
move
put ball
turn left
turn left
turn left * note: Remember,
Karel doesnt know a turn
right command!*
move
move
move
EXERCISE
Set up your grid world to match the Before world.
QUESTIONS
- What are Karels four basic
Have students call out the necessary Karel commands.
commands?
Write these commands out on the board or one of the
- What happens if you go through
provided code editor sheets so that it is a list of
the program backwards, from the
commands. Karel will read these commands from top to
bottom of the list up? Or if you
bottom.
jump randomly from line to line?
Once you have a completed program, walk Karel
through the list of commands step by step to ensure
that Karel achieves the correct result world.
Page 7
BEFORE
AFTER
BEFORE
AFTER
Page 8
PART 4: Group activity: Create Your Own!
20 min
TOPIC
Now that students have had some practice with
Karels grid world and basic commands, its time
for them to make their own programs!
SETUP
Divide students into small groups of two or three and
give each group its own copy of the Karel grid world,
Karel the dog, and a some tennis balls. Or, if you have
enough props, students can make big grid worlds on
the oor. Also give each group their own code editor
where they can write their code commands.
Have the students set up their own starting and result
worlds. Once theyve created their before and after
worlds, they can write the code needed to have Karel
make the result world.
Once each group has written a program, have the
groups pair up with another group. Group A will set up
the starting position for Karel in their program and then
give Group B their text editor with the code
instructions to follow. The students in Group B follows
those instructions and should get to the result world
that Group A intended.
Switch and have Group A run through Group Bs
program.
Page 9
PART 5: Conclusion
20 min
TOPIC
Computers are a key part of our modern world. Computers, like Karel the dog, follow basic lists of
instructions called programs. A program can have a computer complete a task as simple as having Karel
pick up a tennis ball, or as complicated as landing a robot on Mars. Learning how to write programs for
computers means that you will be able to inuence the world around you.
Programming with Karel the dog is a good way to practice writing code to accomplish tasks. Despite
living in a grid world and only knowing four commands, Karel can solve some interesting puzzles.
To continue learning with Karel the dog, visit www.CodeHS.com
DISCUSSION QUESTIONS
VOCABULARY
Part 1
- What is programming?
- What is a computer? What are they
used for? How are humans like a
computer?
- How are instructions used to execute
simple tasks?
Part 1
- Code: Code is the name for the instructions you write
to a computer in a program.
- Computer: A person or device that makes
calculations, stores data, and executes instructions
according to a program.
- Computer program: a list of code instructions a
computer follows in order to perform a task.
- Computing: Executing instructions, calculating, or
using a computer.
Part 2
- What are Karels four basic commands?
- In what kind of world does Karel the
dog live?
- What is a computer program? How is
writing computer programs like giving
commands to Karel the dog?
Part 3
- What are Karels four basic commands?
- What happens if you go through the
program backwards, from the bottom of
the list up? Or if you jump randomly from
line to line?
Part 2
- Move: move forward one spot
- Turn left: turns Karel 90 degrees counter clockwise
- Put ball: put down a tennis ball
- take ball: pick up a tennis ball
- Command: A command is an instruction you can give
to Karel.
- Grid world: A "world" or "Karel World" is a grid that
Karel lives in. It is made up of streets and avenues (rows
and columns).
- Karel: Karel is a dog who listens to your commands.
Page 10
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