diff --git a/.gitignore b/.gitignore
index b512c09d4..72b1282b0 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1 +1,2 @@
-node_modules
\ No newline at end of file
+node_modules
+**/target/**
\ No newline at end of file
diff --git a/rust/tests/fibonacci2_test/Cargo.lock b/rust/tests/fibonacci2_test/Cargo.lock
new file mode 100644
index 000000000..f0d57851c
--- /dev/null
+++ b/rust/tests/fibonacci2_test/Cargo.lock
@@ -0,0 +1,12 @@
+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
+[[package]]
+name = "fibonacci"
+version = "0.1.0"
+
+[[package]]
+name = "fibonacci2_test"
+version = "0.1.0"
+dependencies = [
+ "fibonacci",
+]
diff --git a/rust/tests/fibonacci2_test/Cargo.toml b/rust/tests/fibonacci2_test/Cargo.toml
new file mode 100644
index 000000000..8b2ab8fe5
--- /dev/null
+++ b/rust/tests/fibonacci2_test/Cargo.toml
@@ -0,0 +1,10 @@
+[package]
+name = "fibonacci2_test"
+version = "0.1.0"
+authors = ["Augusto <aug.ornelas@gmail.com>"]
+edition = "2018"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
+fibonacci = {path = "../../../../Documents/rust/rust-piscine-solutions/fibonacci"}
diff --git a/rust/tests/fibonacci2_test/src/main.rs b/rust/tests/fibonacci2_test/src/main.rs
new file mode 100644
index 000000000..a8c26d3a4
--- /dev/null
+++ b/rust/tests/fibonacci2_test/src/main.rs
@@ -0,0 +1,9 @@
+use fibonacci::*;
+
+#[test]
+fn it_works() {
+	assert_eq!(fibonacci(0), 0);
+	assert_eq!(fibonacci(1), 1);
+	assert_eq!(fibonacci(22), 17711);
+	assert_eq!(fibonacci(20), 6765);
+}
diff --git a/rust/tests/scalar_test/Cargo.lock b/rust/tests/scalar_test/Cargo.lock
new file mode 100644
index 000000000..5fa8333c8
--- /dev/null
+++ b/rust/tests/scalar_test/Cargo.lock
@@ -0,0 +1,12 @@
+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
+[[package]]
+name = "scalar"
+version = "0.1.0"
+
+[[package]]
+name = "scalar_test"
+version = "0.1.0"
+dependencies = [
+ "scalar",
+]
diff --git a/rust/tests/scalar_test/Cargo.toml b/rust/tests/scalar_test/Cargo.toml
new file mode 100644
index 000000000..381d686a3
--- /dev/null
+++ b/rust/tests/scalar_test/Cargo.toml
@@ -0,0 +1,10 @@
+[package]
+name = "scalar_test"
+version = "0.1.0"
+authors = ["Augusto <aug.ornelas@gmail.com>"]
+edition = "2018"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
+scalar = {path = "../../../../Documents/rust/rust-piscine-solutions/scalar"}
\ No newline at end of file
diff --git a/rust/tests/scalar_test/src/main.rs b/rust/tests/scalar_test/src/main.rs
new file mode 100644
index 000000000..d7ebe1d99
--- /dev/null
+++ b/rust/tests/scalar_test/src/main.rs
@@ -0,0 +1,28 @@
+use scalar::*;
+
+#[test]
+#[should_panic]
+fn test_panic_sum() {
+	sum(25, 255);
+}
+
+#[test]
+#[should_panic]
+fn test_panic_diff() {
+	diff(-32768, 32766);
+}
+
+#[test]
+#[should_panic]
+fn test_panic_pro() {
+	pro(-128, 2);
+}
+
+#[test]
+fn pass() {
+	assert_eq!(sum(1, 2), 3);
+	assert_eq!(diff(1, 2), -1);
+	assert_eq!(pro(1, 2), 2);
+	assert_eq!(quo(1.0, 2.0), 0.5);
+	assert_eq!(rem(1.0, 2.0), 1.0);
+}
diff --git a/subjects/fibonacci2/README.md b/subjects/fibonacci2/README.md
new file mode 100644
index 000000000..32776d85e
--- /dev/null
+++ b/subjects/fibonacci2/README.md
@@ -0,0 +1,37 @@
+## fibonacci2
+
+### Instructions
+
+Complete the body of the function `fibonacci`.
+
+This functions receives a number n and returns the nth number in the fibonacci series.
+
+The Fibonacci Series starts like this: 0, 1, 1, 2, 3, 5, 8, 13... so fibonacci(2) = 1 and fibonnacci(4) = 3
+
+
+### Expected function
+
+```rust
+ fn fibonacci(n: u32) -> u32 {
+
+ }
+```
+
+### Usage
+
+Here is a possible test for your function:
+
+```
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn it_works() {
+        assert_eq!(fibonacci(2), 1);
+        assert_eq!(fibonacci(4), 1);
+        assert_eq!(fibonacci(22), 17711);
+        assert_eq!(fibonacci(20), 6765);
+    }
+}
+```
diff --git a/subjects/scalar/README.md b/subjects/scalar/README.md
new file mode 100644
index 000000000..c7c20e72b
--- /dev/null
+++ b/subjects/scalar/README.md
@@ -0,0 +1,58 @@
+## Scaler
+
+### Instructions
+Create the following functions, that receives two parameters:
+- sum, that returns the sum between two values from 0 to 255
+- diff, that returns the difference between two values from -32768 to 32767
+- pro, that returns the product of the multiplication between two values from -128 to 127
+- quo, that returns the quotient of the division between two values
+- rem, that returns the remainder of the division between two values
+### Notions
+- https://doc.rust-lang.org/book/ch03-02-data-types.html
+
+
+### Expected functions
+
+```rust
+pub fn sum(a:, b: ) ->  {
+	
+}
+
+pub fn diff(a: , b: ) -> {
+
+}
+
+pub fn pro(a: , b: ) -> {
+
+}
+
+pub fn quo(a: , b: ) -> {
+
+}
+
+pub fn rem(a: , b: ) -> {
+
+}
+```
+
+### Usage:
+
+```rust
+fn main() {
+    // sum
+    println!("sum : {}", sum(234, 2));
+    println!("sum : {}", sum(1, 255)); // 'ERROR: attempt to add with overflow'
+    // diff
+    println!("diff : {}", diff(234, 2));
+    println!("diff : {}", diff(-32768, 32766)); // 'ERROR: attempt to subtract with overflow'
+    // product
+    println!("pro : {}", pro(23, 2));
+    println!("pro : {}", pro(-128, 2)); // 'ERROR: attempt to multiply with overflow'
+    // quotient
+    println!("quo : {}", quo(22.0, 2.0));
+    println!("quo : {}", quo(-128.23, 2.0));
+    // remainder
+    println!("rem : {}", rem(22.0, 2.0));
+    println!("rem : {}", rem(-128.23, 2.0));
+}
+```