diff --git a/rust_compiler/libs/compiler/src/test/math_syscall.rs b/rust_compiler/libs/compiler/src/test/math_syscall.rs
index 85f3032..966a1e3 100644
--- a/rust_compiler/libs/compiler/src/test/math_syscall.rs
+++ b/rust_compiler/libs/compiler/src/test/math_syscall.rs
@@ -3,6 +3,386 @@ use anyhow::Result;
 use indoc::indoc;
 use pretty_assertions::assert_eq;
 
+#[test]
 fn test_acos() -> Result<()> {
-    todo!()
+    let compiled = compile! {
+        debug
+        "
+        let i = acos(123);
+        "
+    };
+
+    assert_eq!(
+        compiled,
+        indoc! {
+            "
+            j main
+            main:
+            acos r15 123
+            move r8 r15 #i
+            "
+        }
+    );
+
+    Ok(())
+}
+
+#[test]
+fn test_asin() -> Result<()> {
+    let compiled = compile! {
+        debug
+        "
+        let i = asin(123);
+        "
+    };
+
+    assert_eq!(
+        compiled,
+        indoc! {
+            "
+            j main
+            main:
+            asin r15 123
+            move r8 r15 #i
+            "
+        }
+    );
+
+    Ok(())
+}
+
+#[test]
+fn test_atan() -> Result<()> {
+    let compiled = compile! {
+        debug
+        "
+        let i = atan(123);
+        "
+    };
+
+    assert_eq!(
+        compiled,
+        indoc! {
+            "
+            j main
+            main:
+            atan r15 123
+            move r8 r15 #i
+            "
+        }
+    );
+
+    Ok(())
+}
+
+#[test]
+fn test_atan2() -> Result<()> {
+    let compiled = compile! {
+        debug
+        "
+        let i = atan2(123, 456);
+        "
+    };
+
+    assert_eq!(
+        compiled,
+        indoc! {
+            "
+            j main
+            main:
+            atan2 r15 123 456
+            move r8 r15 #i
+            "
+        }
+    );
+
+    Ok(())
+}
+
+#[test]
+fn test_abs() -> Result<()> {
+    let compiled = compile! {
+        debug
+        "
+        let i = abs(-123);
+        "
+    };
+
+    assert_eq!(
+        compiled,
+        indoc! {
+            "
+            j main
+            main:
+            abs r15 -123
+            move r8 r15 #i
+            "
+        }
+    );
+
+    Ok(())
+}
+
+#[test]
+fn test_ceil() -> Result<()> {
+    let compiled = compile! {
+        debug
+        "
+        let i = ceil(123.90);
+        "
+    };
+
+    assert_eq!(
+        compiled,
+        indoc! {
+            "
+            j main
+            main:
+            ceil r15 123.90
+            move r8 r15 #i
+            "
+        }
+    );
+
+    Ok(())
+}
+
+#[test]
+fn test_cos() -> Result<()> {
+    let compiled = compile! {
+        debug
+        "
+        let i = cos(123);
+        "
+    };
+
+    assert_eq!(
+        compiled,
+        indoc! {
+            "
+            j main
+            main:
+            cos r15 123
+            move r8 r15 #i
+            "
+        }
+    );
+
+    Ok(())
+}
+
+#[test]
+fn test_floor() -> Result<()> {
+    let compiled = compile! {
+        debug
+        "
+        let i = floor(123);
+        "
+    };
+
+    assert_eq!(
+        compiled,
+        indoc! {
+            "
+            j main
+            main:
+            floor r15 123
+            move r8 r15 #i
+            "
+        }
+    );
+
+    Ok(())
+}
+
+#[test]
+fn test_log() -> Result<()> {
+    let compiled = compile! {
+        debug
+        "
+        let i = log(123);
+        "
+    };
+
+    assert_eq!(
+        compiled,
+        indoc! {
+            "
+            j main
+            main:
+            log r15 123
+            move r8 r15 #i
+            "
+        }
+    );
+
+    Ok(())
+}
+
+#[test]
+fn test_max() -> Result<()> {
+    let compiled = compile! {
+        debug
+        "
+        let i = max(123, 456);
+        "
+    };
+
+    assert_eq!(
+        compiled,
+        indoc! {
+            "
+            j main
+            main:
+            max r15 123 456
+            move r8 r15 #i
+            "
+        }
+    );
+
+    Ok(())
+}
+
+#[test]
+fn test_min() -> Result<()> {
+    let compiled = compile! {
+        debug
+        "
+        let i = min(123, 456);
+        "
+    };
+
+    assert_eq!(
+        compiled,
+        indoc! {
+            "
+            j main
+            main:
+            min r15 123 456
+            move r8 r15 #i
+            "
+        }
+    );
+
+    Ok(())
+}
+
+#[test]
+fn test_rand() -> Result<()> {
+    let compiled = compile! {
+        debug
+        "
+        let i = rand();
+        "
+    };
+
+    assert_eq!(
+        compiled,
+        indoc! {
+            "
+            j main
+            main:
+            rand r15
+            move r8 r15 #i
+            "
+        }
+    );
+
+    Ok(())
+}
+
+#[test]
+fn test_sin() -> Result<()> {
+    let compiled = compile! {
+        debug
+        "
+        let i = sin(3);
+        "
+    };
+
+    assert_eq!(
+        compiled,
+        indoc! {
+            "
+            j main
+            main:
+            sin r15 3
+            move r8 r15 #i
+            "
+        }
+    );
+
+    Ok(())
+}
+
+#[test]
+fn test_sqrt() -> Result<()> {
+    let compiled = compile! {
+        debug
+        "
+        let i = sqrt(3);
+        "
+    };
+
+    assert_eq!(
+        compiled,
+        indoc! {
+            "
+            j main
+            main:
+            sqrt r15 3
+            move r8 r15 #i
+            "
+        }
+    );
+
+    Ok(())
+}
+
+#[test]
+fn test_tan() -> Result<()> {
+    let compiled = compile! {
+        debug
+        "
+        let i = tan(3);
+        "
+    };
+
+    assert_eq!(
+        compiled,
+        indoc! {
+            "
+            j main
+            main:
+            tan r15 3
+            move r8 r15 #i
+            "
+        }
+    );
+
+    Ok(())
+}
+
+#[test]
+fn test_trunc() -> Result<()> {
+    let compiled = compile! {
+        debug
+        "
+        let i = trunc(3.234);
+        "
+    };
+
+    assert_eq!(
+        compiled,
+        indoc! {
+            "
+            j main
+            main:
+            trunc r15 3.234
+            move r8 r15 #i
+            "
+        }
+    );
+
+    Ok(())
 }
diff --git a/rust_compiler/libs/compiler/src/v1.rs b/rust_compiler/libs/compiler/src/v1.rs
index 5c93aa6..005b95f 100644
--- a/rust_compiler/libs/compiler/src/v1.rs
+++ b/rust_compiler/libs/compiler/src/v1.rs
@@ -552,19 +552,14 @@ impl<'a, W: std::io::Write> Compiler<'a, W> {
             }
             Expression::Syscall(spanned_call) => {
                 let sys_call = spanned_call.node;
-                let SysCall::System(call) = sys_call else {
-                    // Math syscalls might be handled differently or here
-                    // For now assuming System returns value
-                    return Err(Error::Unknown(
-                        "Math syscall not yet supported in declaration".into(),
-                        Some(spanned_call.span),
-                    ));
+                let res = match sys_call {
+                    SysCall::System(s) => {
+                        self.expression_syscall_system(s, spanned_call.span, scope)?
+                    }
+                    SysCall::Math(m) => self.expression_syscall_math(m, scope)?,
                 };
 
-                if self
-                    .expression_syscall_system(call, spanned_call.span, scope)?
-                    .is_none()
-                {
+                if res.is_none() {
                     return Err(Error::Unknown(
                         "SysCall did not return a value".into(),
                         Some(spanned_call.span),
diff --git a/rust_compiler/libs/parser/src/lib.rs b/rust_compiler/libs/parser/src/lib.rs
index b720174..2011ebb 100644
--- a/rust_compiler/libs/parser/src/lib.rs
+++ b/rust_compiler/libs/parser/src/lib.rs
@@ -1889,7 +1889,7 @@ impl<'a> Parser<'a> {
                 Ok(SysCall::Math(Math::Log(boxed!(arg))))
             }
             "max" => {
-                check_length(self, &invocation.arguments, 1)?;
+                check_length(self, &invocation.arguments, 2)?;
                 let mut args = invocation.arguments.into_iter();
                 let arg1 = args.next().ok_or(Error::UnexpectedEOF)?;
                 let arg2 = args.next().ok_or(Error::UnexpectedEOF)?;