Integers

Mix.install([
  {:jason, "~> 1.4"},
  {:kino, "~> 0.9", override: true},
  {:youtube, github: "brooklinjazz/youtube"},
  {:hidden_cell, github: "brooklinjazz/hidden_cell"}
])

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Setup

Ensure you type the ea keyboard shortcut to evaluate all Elixir cells before starting. Alternatively you can evaluate the Elixir cells as you read.

Balance The Scale

Use integers to balance the scale.

For example, if 10 were on the left and 20 were on the right, you would add 10 to the left or add -10 to the right.

flowchart LR
Left --- Right
subgraph Right
100
end

subgraph Left
10
end

Kino.Input.number("add ___ to the left")

flowchart LR
Left --- Right

subgraph Left
17
end

subgraph Right
13
2
5
end

Kino.Input.number("add ___ to the left")

flowchart LR
Left --- Right

subgraph Left
20
end

subgraph Right
5
19
1
end

Kino.Input.number("add ___ from the right")

flowchart LR
Left --- Right

subgraph Left
-5
10
end

subgraph Right
1
2
end

Kino.Input.number("add ___ to the right")

flowchart LR
Left --- Right

subgraph Left
A[10 * 10]
20
end

subgraph Right
110
end

Kino.Input.number("add ___ to the right")

flowchart LR
Left --- Right

subgraph Left
A[20 - 5]
10
end

subgraph Right
  20
end

Kino.Input.number("add ___ to the right")

flowchart LR
Left --- Right

subgraph Left
25
end

subgraph Right
20
end

Kino.Input.number("add ___ to the left")

Solve For X

In the Elixir cells below, enter the result of the equation. You should use Arithmetic Operators rather than solving the equation.

Four plus 3 times 10.

Ten times ten times ten.

Ten to the power of two hundred and one.

Ten minus fourteen plus twelve.

The remainder of 10 / 3.

200 divided by 3.

Half of 214.

75% of 456.

Ten minus two times 5.

(Ten minus two) times 5.

Divide 10 by 3.

Use integer division to divide 10 by 3.

Ten minus two times 10 to the power of 2.

Negative ten plus four.

Five plus negative six minus negative two.

60 percent of 5 plus four.

Seventy divided by (ten plus two).

Mark As Completed

file_name = Path.basename(Regex.replace(~r/#.+/, __ENV__.file, ""), ".livemd")

progress_path = __DIR__ <> "/../progress.json"
existing_progress = File.read!(progress_path) |> Jason.decode!()

default = Map.get(existing_progress, file_name, false)

form =
  Kino.Control.form(
    [
      completed: input = Kino.Input.checkbox("Mark As Completed", default: default)
    ],
    report_changes: true
  )

Task.async(fn ->
  for %{data: %{completed: completed}} <- Kino.Control.stream(form) do
    File.write!(progress_path, Jason.encode!(Map.put(existing_progress, file_name, completed)))
  end
end)

form

Commit Your Progress

Run the following in your command line from the curriculum folder to track and save your progress in a Git commit. Ensure that you do not already have undesired or unrelated changes by running git status or by checking the source control tab in Visual Studio Code.

$ git checkout solutions
$ git checkout -b arithmetic-exercise
$ git add .
$ git commit -m "finish arithmetic exercise"
$ git push origin arithmetic-exercise

Create a pull request from your arithmetic-exercise branch to your solutions branch. Please do not create a pull request to the DockYard Academy repository as this will spam our PR tracker.

DockYard Academy Students Only:

Notify your instructor by including @BrooklinJazz in your PR description to get feedback. You (or your instructor) may merge your PR into your solutions branch after review.

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