diff --git a/1ano/2semestre/poo/src/utils/MathTools.java b/1ano/2semestre/poo/src/utils/MathTools.java
new file mode 100644
index 0000000..fa7c389
--- /dev/null
+++ b/1ano/2semestre/poo/src/utils/MathTools.java
@@ -0,0 +1,7 @@
+package utils;
+
+public class MathTools {
+    public static double round(double n, int places) {
+        return (Math.round(n * Math.pow(10, places))) / Math.pow(10, places);
+    }
+}
diff --git a/1ano/2semestre/poo/src/utils/UserInput.java b/1ano/2semestre/poo/src/utils/UserInput.java
new file mode 100644
index 0000000..6aa8238
--- /dev/null
+++ b/1ano/2semestre/poo/src/utils/UserInput.java
@@ -0,0 +1,21 @@
+package utils;
+
+import java.util.Scanner;
+
+public class UserInput {
+    public static double getNumberBetween(Scanner sin, double min, double max) {
+        double input;
+        do {
+            input = sin.nextDouble();
+        } while (input > max || input < min);
+        return input;
+    }
+
+    public static double getPositiveNumber(Scanner sin) {
+        double input;
+        do {
+            input = sin.nextDouble();
+        } while (input <= 0);
+        return input;
+    }
+}