ADD file via upload

Addition.java

@@ -0,0 +1,24 @@
+package visibleArithmeticExercise;
+
+import visibleArithmeticExercise.Operation;
+
+public class Addition extends Operation {
+
+    static String ch = "+";
+
+    public Addition(int n) {
+        super(ch,n);
+    }
+
+    @Override
+    public void operation() {
+        correctAnswer = op1 + op2;
+    }
+
+    public void isNumRight(){}
+
+    public void setRange(){
+        minRange = 0;
+        maxRange = maxInt + maxInt;
+    }
+}