diff --git a/.github/workflows/actions/rust-toolchain/action.yml b/.github/workflows/actions/rust-toolchain/action.yml
new file mode 100644
index 0000000..4547904
--- /dev/null
+++ b/.github/workflows/actions/rust-toolchain/action.yml
@@ -0,0 +1,25 @@
+name: rust-toolchain
+inputs:
+  toolchain:
+    description: "Which rust toolchain to use"
+    required: false
+
+runs:
+  using: "composite"
+  steps:
+    - id: get-toolchain
+      shell: bash
+      run: |
+        USER_OVERRIDE=${{ inputs.toolchain }}
+        DEFAULT_TOOLCHAIN=$(grep channel rust-toolchain.toml | awk '{print $3}' | sed 's/"//g')
+        TOOLCHAIN=${USER_OVERRIDE:-$DEFAULT_TOOLCHAIN}
+        echo "toolchain=$TOOLCHAIN" >> $GITHUB_OUTPUT
+
+    - uses: actions-rs/toolchain@v1
+      with:
+        profile: minimal
+        toolchain: ${{ steps.get-toolchain.outputs.toolchain }}
+        override: true
+    - uses: Swatinem/rust-cache@v2.0.0
+      with:
+        shared-key: ${{ steps.get-toolchain.outputs.toolchain }}
diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
new file mode 100644
index 0000000..f139730
--- /dev/null
+++ b/.github/workflows/ci.yml
@@ -0,0 +1,77 @@
+name: ci-rust-push
+
+on:
+  push:
+    branches:
+      - 'main'
+      - 'master'
+
+jobs:
+  skip-duplicates:
+    runs-on: ubuntu-latest
+    outputs:
+      should_skip: ${{ steps.skip_check.outputs.should_skip }}
+    steps:
+      - id: skip_check
+        uses: fkirc/skip-duplicate-actions@v5
+        with:
+          concurrent_skipping: "same_content_newer"
+
+  check:
+    needs: skip-duplicates
+    if: needs.skip-duplicates.outputs.should_skip != 'true'
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v3
+        with:
+          submodules: recursive
+      - uses: ./.github/workflows/actions/rust-toolchain
+      - run: cargo check --all-features
+
+  test:
+    needs: skip-duplicates
+    if: needs.skip-duplicates.outputs.should_skip != 'true'
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v3
+        with:
+          submodules: recursive
+      - uses: ./.github/workflows/actions/rust-toolchain
+      - run: cargo test --all-features
+
+  fmt:
+    needs: skip-duplicates
+    if: needs.skip-duplicates.outputs.should_skip != 'true'
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v3
+        with:
+          submodules: recursive
+      - uses: ./.github/workflows/actions/rust-toolchain
+        with:
+          toolchain: nightly
+      - run: rustup component add rustfmt
+      - run: cargo fmt --all --check
+
+  clippy:
+    needs: skip-duplicates
+    if: needs.skip-duplicates.outputs.should_skip != 'true'
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v3
+        with:
+          submodules: recursive
+      - uses: ./.github/workflows/actions/rust-toolchain
+      - run: rustup component add clippy
+      - run: cargo clippy --all-features -- --deny warnings
+
+  doc:
+    needs: skip-duplicates
+    if: needs.skip-duplicates.outputs.should_skip != 'true'
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v3
+        with:
+          submodules: recursive
+      - uses: ./.github/workflows/actions/rust-toolchain
+      - run: cargo doc --all-features --no-deps
diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..791af9f
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,2 @@
+/target
+/logs
diff --git a/Cargo.lock b/Cargo.lock
new file mode 100644
index 0000000..ae15f94
--- /dev/null
+++ b/Cargo.lock
@@ -0,0 +1,65 @@
+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
+version = 3
+
+[[package]]
+name = "const-decimal"
+version = "0.1.0"
+dependencies = [
+ "serde",
+]
+
+[[package]]
+name = "proc-macro2"
+version = "1.0.86"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "5e719e8df665df0d1c8fbfd238015744736151d4445ec0836b8e628aae103b77"
+dependencies = [
+ "unicode-ident",
+]
+
+[[package]]
+name = "quote"
+version = "1.0.37"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "b5b9d34b8991d19d98081b46eacdd8eb58c6f2b201139f7c5f643cc155a633af"
+dependencies = [
+ "proc-macro2",
+]
+
+[[package]]
+name = "serde"
+version = "1.0.210"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "c8e3592472072e6e22e0a54d5904d9febf8508f65fb8552499a1abc7d1078c3a"
+dependencies = [
+ "serde_derive",
+]
+
+[[package]]
+name = "serde_derive"
+version = "1.0.210"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "243902eda00fad750862fc144cea25caca5e20d615af0a81bee94ca738f1df1f"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "syn",
+]
+
+[[package]]
+name = "syn"
+version = "2.0.77"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "9f35bcdf61fd8e7be6caf75f429fdca8beb3ed76584befb503b1569faee373ed"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "unicode-ident",
+]
+
+[[package]]
+name = "unicode-ident"
+version = "1.0.12"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "3354b9ac3fae1ff6755cb6db53683adb661634f67557942dea4facebec0fee4b"
diff --git a/Cargo.toml b/Cargo.toml
new file mode 100644
index 0000000..9fdd59a
--- /dev/null
+++ b/Cargo.toml
@@ -0,0 +1,36 @@
+[package]
+name = "const-decimal"
+version = "0.1.0"
+authors = ["Oliver Chalk"]
+edition = "2021"
+readme = "README.md"
+
+[lints.clippy]
+cast_possible_truncation = 'warn'
+cast_possible_wrap = 'warn'
+cast_sign_loss = 'warn'
+# See `clippy.toml`.
+disallowed_methods = 'warn'
+
+[features]
+serde = ["dep:serde"]
+
+[dependencies]
+serde = { version = "1.0.210", features = ["derive"], optional = true }
+
+[build-dependencies]
+
+[profile.release]
+opt-level = 3
+debug = true
+
+[profile.paranoid]
+inherits = "release"
+overflow-checks = true
+debug-assertions = true
+
+[profile.performance]
+inherits = "release"
+lto = "fat"
+codegen-units = 1
+incremental = false
diff --git a/README.md b/README.md
new file mode 100644
index 0000000..5b1c380
--- /dev/null
+++ b/README.md
@@ -0,0 +1,3 @@
+# Const Point
+
+Fixed precision maths type implemented using compile time constants.
diff --git a/clippy.toml b/clippy.toml
new file mode 100644
index 0000000..baf057c
--- /dev/null
+++ b/clippy.toml
@@ -0,0 +1,13 @@
+[[disallowed-methods]]
+path = "core::cmp::Ord::min"
+reason = '''
+Too easy to misread `x.min(y)` as "let the minimum value of `x` be `y`" when it actually means the exact opposite;
+Use `std::cmp::min` instead.
+'''
+
+[[disallowed-methods]]
+path = "core::cmp::Ord::max"
+reason = '''
+Too easy to misread `x.max(y)` as "let the maximum value of `x` be `y`" when it actually means the exact opposite;
+Use `std::cmp::max` instead.
+'''
diff --git a/rust-toolchain.toml b/rust-toolchain.toml
new file mode 100644
index 0000000..624eb0e
--- /dev/null
+++ b/rust-toolchain.toml
@@ -0,0 +1,2 @@
+[toolchain]
+channel = "1.76.0"
diff --git a/rustfmt.toml b/rustfmt.toml
new file mode 100644
index 0000000..b14388b
--- /dev/null
+++ b/rustfmt.toml
@@ -0,0 +1,10 @@
+edition = "2021"
+error_on_line_overflow = true
+wrap_comments = true
+use_field_init_shorthand = true
+imports_granularity = "Module"
+condense_wildcard_suffixes = true
+format_strings = true
+group_imports = "StdExternalCrate"
+use_small_heuristics = "Max"
+chain_width = 60
diff --git a/src/lib.rs b/src/lib.rs
new file mode 100644
index 0000000..ae9cd0d
--- /dev/null
+++ b/src/lib.rs
@@ -0,0 +1,72 @@
+use std::ops::{Add, Div, Mul, Sub};
+
+pub const PRECISION_FACTOR: u64 = 10u64.pow(9);
+
+#[cfg_attr(feature = "serde", derive(serde::Serialize, serde::Deserialize))]
+#[derive(Debug, PartialEq, Eq, PartialOrd, Ord, Hash)]
+pub struct Decimal64(pub u64);
+
+impl Decimal64 {
+    pub const ONE: Decimal64 = Decimal64(PRECISION_FACTOR);
+}
+
+impl Add for Decimal64 {
+    type Output = Self;
+
+    #[inline]
+    fn add(self, rhs: Self) -> Self::Output {
+        Decimal64(self.0 + rhs.0)
+    }
+}
+
+impl Sub for Decimal64 {
+    type Output = Self;
+
+    #[inline]
+    fn sub(self, rhs: Self) -> Self::Output {
+        Decimal64(self.0 - rhs.0)
+    }
+}
+
+impl Mul for Decimal64 {
+    type Output = Self;
+
+    #[inline]
+    fn mul(self, rhs: Self) -> Self::Output {
+        Decimal64(self.0 * rhs.0 / PRECISION_FACTOR)
+    }
+}
+
+impl Div for Decimal64 {
+    type Output = Self;
+
+    #[inline]
+    fn div(self, rhs: Self) -> Self::Output {
+        Decimal64(self.0 * PRECISION_FACTOR / rhs.0)
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn add() {
+        assert_eq!(Decimal64::ONE + Decimal64::ONE, Decimal64(PRECISION_FACTOR * 2));
+    }
+
+    #[test]
+    fn sub() {
+        assert_eq!(Decimal64::ONE - Decimal64::ONE, Decimal64(0));
+    }
+
+    #[test]
+    fn mul() {
+        assert_eq!(Decimal64::ONE * Decimal64::ONE, Decimal64::ONE);
+    }
+
+    #[test]
+    fn div() {
+        assert_eq!(Decimal64::ONE / Decimal64::ONE, Decimal64::ONE);
+    }
+}
diff --git a/taplo.toml b/taplo.toml
new file mode 100644
index 0000000..73ee440
--- /dev/null
+++ b/taplo.toml
@@ -0,0 +1,10 @@
+[formatting]
+column_width = 120
+array_auto_expand = true
+allowed_blank_lines = 1
+
+[[rule]]
+keys = ["dependencies", "dev-dependencies", "build-dependencies", "toolchain", "workspace.dependencies"]
+
+[rule.formatting]
+reorder_keys = true