diff --git a/.idea/codeStyles/Project.xml b/.idea/codeStyles/Project.xml
deleted file mode 100644
index 681f41a..0000000
--- a/.idea/codeStyles/Project.xml
+++ /dev/null
@@ -1,116 +0,0 @@
-<component name="ProjectCodeStyleConfiguration">
-  <code_scheme name="Project" version="173">
-    <codeStyleSettings language="XML">
-      <indentOptions>
-        <option name="CONTINUATION_INDENT_SIZE" value="4" />
-      </indentOptions>
-      <arrangement>
-        <rules>
-          <section>
-            <rule>
-              <match>
-                <AND>
-                  <NAME>xmlns:android</NAME>
-                  <XML_ATTRIBUTE />
-                  <XML_NAMESPACE>^$</XML_NAMESPACE>
-                </AND>
-              </match>
-            </rule>
-          </section>
-          <section>
-            <rule>
-              <match>
-                <AND>
-                  <NAME>xmlns:.*</NAME>
-                  <XML_ATTRIBUTE />
-                  <XML_NAMESPACE>^$</XML_NAMESPACE>
-                </AND>
-              </match>
-              <order>BY_NAME</order>
-            </rule>
-          </section>
-          <section>
-            <rule>
-              <match>
-                <AND>
-                  <NAME>.*:id</NAME>
-                  <XML_ATTRIBUTE />
-                  <XML_NAMESPACE>http://schemas.android.com/apk/res/android</XML_NAMESPACE>
-                </AND>
-              </match>
-            </rule>
-          </section>
-          <section>
-            <rule>
-              <match>
-                <AND>
-                  <NAME>.*:name</NAME>
-                  <XML_ATTRIBUTE />
-                  <XML_NAMESPACE>http://schemas.android.com/apk/res/android</XML_NAMESPACE>
-                </AND>
-              </match>
-            </rule>
-          </section>
-          <section>
-            <rule>
-              <match>
-                <AND>
-                  <NAME>name</NAME>
-                  <XML_ATTRIBUTE />
-                  <XML_NAMESPACE>^$</XML_NAMESPACE>
-                </AND>
-              </match>
-            </rule>
-          </section>
-          <section>
-            <rule>
-              <match>
-                <AND>
-                  <NAME>style</NAME>
-                  <XML_ATTRIBUTE />
-                  <XML_NAMESPACE>^$</XML_NAMESPACE>
-                </AND>
-              </match>
-            </rule>
-          </section>
-          <section>
-            <rule>
-              <match>
-                <AND>
-                  <NAME>.*</NAME>
-                  <XML_ATTRIBUTE />
-                  <XML_NAMESPACE>^$</XML_NAMESPACE>
-                </AND>
-              </match>
-              <order>BY_NAME</order>
-            </rule>
-          </section>
-          <section>
-            <rule>
-              <match>
-                <AND>
-                  <NAME>.*</NAME>
-                  <XML_ATTRIBUTE />
-                  <XML_NAMESPACE>http://schemas.android.com/apk/res/android</XML_NAMESPACE>
-                </AND>
-              </match>
-              <order>ANDROID_ATTRIBUTE_ORDER</order>
-            </rule>
-          </section>
-          <section>
-            <rule>
-              <match>
-                <AND>
-                  <NAME>.*</NAME>
-                  <XML_ATTRIBUTE />
-                  <XML_NAMESPACE>.*</XML_NAMESPACE>
-                </AND>
-              </match>
-              <order>BY_NAME</order>
-            </rule>
-          </section>
-        </rules>
-      </arrangement>
-    </codeStyleSettings>
-  </code_scheme>
-</component>
\ No newline at end of file
diff --git a/.idea/misc.xml b/.idea/misc.xml
deleted file mode 100644
index 37a7509..0000000
--- a/.idea/misc.xml
+++ /dev/null
@@ -1,9 +0,0 @@
-<?xml version="1.0" encoding="UTF-8"?>
-<project version="4">
-  <component name="ProjectRootManager" version="2" languageLevel="JDK_1_7" project-jdk-name="1.8" project-jdk-type="JavaSDK">
-    <output url="file://$PROJECT_DIR$/build/classes" />
-  </component>
-  <component name="ProjectType">
-    <option name="id" value="Android" />
-  </component>
-</project>
\ No newline at end of file
diff --git a/.idea/runConfigurations.xml b/.idea/runConfigurations.xml
deleted file mode 100644
index 7f68460..0000000
--- a/.idea/runConfigurations.xml
+++ /dev/null
@@ -1,12 +0,0 @@
-<?xml version="1.0" encoding="UTF-8"?>
-<project version="4">
-  <component name="RunConfigurationProducerService">
-    <option name="ignoredProducers">
-      <set>
-        <option value="org.jetbrains.plugins.gradle.execution.test.runner.AllInPackageGradleConfigurationProducer" />
-        <option value="org.jetbrains.plugins.gradle.execution.test.runner.TestClassGradleConfigurationProducer" />
-        <option value="org.jetbrains.plugins.gradle.execution.test.runner.TestMethodGradleConfigurationProducer" />
-      </set>
-    </option>
-  </component>
-</project>
\ No newline at end of file
diff --git a/.idea/vcs.xml b/.idea/vcs.xml
deleted file mode 100644
index 94a25f7..0000000
--- a/.idea/vcs.xml
+++ /dev/null
@@ -1,6 +0,0 @@
-<?xml version="1.0" encoding="UTF-8"?>
-<project version="4">
-  <component name="VcsDirectoryMappings">
-    <mapping directory="$PROJECT_DIR$" vcs="Git" />
-  </component>
-</project>
\ No newline at end of file
diff --git a/app/src/main/res/layout/content_answer_view.xml b/app/src/main/res/layout/content_answer_view.xml
index 970907e..cfeceec 100644
--- a/app/src/main/res/layout/content_answer_view.xml
+++ b/app/src/main/res/layout/content_answer_view.xml
@@ -11,7 +11,7 @@
         android:layout_marginTop="16dp"
         android:gravity="end"
         android:textSize="24sp"
-        android:text="Total Calculation"
+        android:text="@string/total_calculation"
         android:textColor="#757575"
         android:layout_width="match_parent"
         android:layout_height="wrap_content"/>
@@ -24,7 +24,7 @@
         android:layout_marginEnd="16dp"
         android:gravity="end"
         android:textSize="32sp"
-        android:text="Current Calculation"
+        android:text="@string/current_calculation"
         android:textColor="#757575"
         android:layout_width="match_parent"
         android:layout_height="wrap_content"/>
diff --git a/app/src/main/res/layout/content_number_board.xml b/app/src/main/res/layout/content_number_board.xml
index d98056e..e6a81d6 100644
--- a/app/src/main/res/layout/content_number_board.xml
+++ b/app/src/main/res/layout/content_number_board.xml
@@ -8,7 +8,7 @@
 
     <com.google.android.material.button.MaterialButton
         android:id="@+id/btn_clear"
-        android:text="C"
+        android:text="@string/clear"
         android:backgroundTint="@color/colorClearKey"
         style="@style/CalculatorKeys"
         android:layout_marginTop="16dp"
@@ -24,7 +24,7 @@
     <com.google.android.material.button.MaterialButton
         android:id="@+id/btn_opening_brace"
         style="@style/CalculatorKeys"
-        android:text="("
+        android:text="@string/left_parenthese"
         app:layout_constraintBottom_toBottomOf="@+id/btn_clear"
         app:layout_constraintEnd_toStartOf="@+id/btn_closing_brace"
         app:layout_constraintHorizontal_bias="0.5"
@@ -33,7 +33,7 @@
 
     <com.google.android.material.button.MaterialButton
         android:id="@+id/btn_closing_brace"
-        android:text=")"
+        android:text="@string/right_parenthese"
         style="@style/CalculatorKeys"
         app:layout_constraintBottom_toBottomOf="@+id/btn_opening_brace"
         app:layout_constraintEnd_toStartOf="@+id/btn_division"
@@ -43,7 +43,7 @@
 
     <com.google.android.material.button.MaterialButton
         android:id="@+id/btn_division"
-        android:text="/"
+        android:text="@string/divided"
         android:textColor="@android:color/white"
         android:backgroundTint="@color/colorOperatorKey"
         style="@style/CalculatorKeys"
@@ -56,7 +56,7 @@
 
     <com.google.android.material.button.MaterialButton
         android:id="@+id/btn_seven"
-        android:text="7"
+        android:text="@string/seven"
         style="@style/CalculatorKeys"
         app:layout_constraintBottom_toTopOf="@+id/btn_four"
         app:layout_constraintEnd_toStartOf="@+id/btn_eight"
@@ -66,7 +66,7 @@
 
     <com.google.android.material.button.MaterialButton
         android:id="@+id/btn_eight"
-        android:text="8"
+        android:text="@string/eight"
         style="@style/CalculatorKeys"
         app:layout_constraintBottom_toBottomOf="@+id/btn_seven"
         app:layout_constraintEnd_toStartOf="@+id/btn_nine"
@@ -75,7 +75,7 @@
         app:layout_constraintTop_toTopOf="@+id/btn_seven" />
 
     <com.google.android.material.button.MaterialButton
-        android:text="9"
+        android:text="@string/nine"
         android:id="@+id/btn_nine"
         style="@style/CalculatorKeys"
         app:layout_constraintBottom_toBottomOf="@+id/btn_eight"
@@ -85,7 +85,7 @@
         app:layout_constraintTop_toTopOf="@+id/btn_eight" />
 
     <com.google.android.material.button.MaterialButton
-        android:text="X"
+        android:text="@string/multiplied"
         android:textColor="@android:color/white"
         android:backgroundTint="@color/colorOperatorKey"
         android:id="@+id/btn_multiplication"
@@ -98,7 +98,7 @@
 
     <com.google.android.material.button.MaterialButton
         android:id="@+id/btn_four"
-        android:text="4"
+        android:text="@string/four"
         style="@style/CalculatorKeys"
         app:layout_constraintBottom_toTopOf="@+id/btn_one"
         app:layout_constraintEnd_toStartOf="@+id/btn_five"
@@ -108,7 +108,7 @@
 
     <com.google.android.material.button.MaterialButton
         android:id="@+id/btn_five"
-        android:text="5"
+        android:text="@string/five"
         style="@style/CalculatorKeys"
         app:layout_constraintBottom_toBottomOf="@+id/btn_four"
         app:layout_constraintEnd_toStartOf="@+id/btn_six"
@@ -118,7 +118,7 @@
 
     <com.google.android.material.button.MaterialButton
         android:id="@+id/btn_six"
-        android:text="6"
+        android:text="@string/six"
         style="@style/CalculatorKeys"
         app:layout_constraintBottom_toBottomOf="@+id/btn_five"
         app:layout_constraintEnd_toStartOf="@+id/btn_subtraction"
@@ -129,7 +129,7 @@
     <com.google.android.material.button.MaterialButton
         android:id="@+id/btn_subtraction"
         style="@style/CalculatorKeys"
-        android:text="-"
+        android:text="@string/minus"
         android:textColor="@android:color/white"
         android:backgroundTint="@color/colorOperatorKey"
         app:layout_constraintBottom_toBottomOf="@+id/btn_six"
@@ -140,7 +140,7 @@
 
     <com.google.android.material.button.MaterialButton
         android:id="@+id/btn_one"
-        android:text="1"
+        android:text="@string/one"
         style="@style/CalculatorKeys"
         app:layout_constraintBottom_toTopOf="@+id/btn_zero"
         app:layout_constraintEnd_toStartOf="@+id/btn_two"
@@ -150,7 +150,7 @@
 
     <com.google.android.material.button.MaterialButton
         android:id="@+id/btn_two"
-        android:text="2"
+        android:text="@string/two"
         style="@style/CalculatorKeys"
         app:layout_constraintBottom_toBottomOf="@+id/btn_one"
         app:layout_constraintEnd_toStartOf="@+id/btn_three"
@@ -161,7 +161,7 @@
     <com.google.android.material.button.MaterialButton
         android:id="@+id/btn_three"
         style="@style/CalculatorKeys"
-        android:text="3"
+        android:text="@string/three"
         app:layout_constraintBottom_toBottomOf="@+id/btn_two"
         app:layout_constraintEnd_toStartOf="@+id/btn_addition"
         app:layout_constraintHorizontal_bias="0.5"
@@ -171,7 +171,7 @@
     <com.google.android.material.button.MaterialButton
         android:id="@+id/btn_addition"
         style="@style/CalculatorKeys"
-        android:text="+"
+        android:text="@string/plus"
         android:textColor="@android:color/white"
         android:backgroundTint="@color/colorOperatorKey"
         app:layout_constraintBottom_toBottomOf="@+id/btn_three"
@@ -185,7 +185,7 @@
         style="@style/CalculatorKeys"
         android:layout_width="0dp"
         android:width="0dp"
-        android:text="0"
+        android:text="@string/zero"
         app:layout_constraintBottom_toBottomOf="parent"
         app:layout_constraintEnd_toEndOf="@+id/btn_two"
         app:layout_constraintHorizontal_bias="0.5"
@@ -195,7 +195,7 @@
     <com.google.android.material.button.MaterialButton
         android:id="@+id/btn_point"
         style="@style/CalculatorKeys"
-        android:text="."
+        android:text="@string/dot"
         app:layout_constraintBottom_toBottomOf="@+id/btn_zero"
         app:layout_constraintEnd_toStartOf="@+id/btn_equals"
         app:layout_constraintHorizontal_bias="0.5"
@@ -205,7 +205,7 @@
     <com.google.android.material.button.MaterialButton
         android:id="@+id/btn_equals"
         style="@style/CalculatorKeys"
-        android:text="="
+        android:text="@string/equal_to"
         android:textColor="@android:color/white"
         android:backgroundTint="@color/colorEqualKey"
         app:layout_constraintBottom_toBottomOf="@+id/btn_point"
diff --git a/app/src/main/res/values/strings.xml b/app/src/main/res/values/strings.xml
index 3c3a285..82eb596 100644
--- a/app/src/main/res/values/strings.xml
+++ b/app/src/main/res/values/strings.xml
@@ -1,3 +1,24 @@
 <resources>
     <string name="app_name">Calci</string>
+    <string name="total_calculation">Total Calculation</string>
+    <string name="current_calculation">Current Calculation</string>
+    <string name="clear">C</string>
+    <string name="left_parenthese">(</string>
+    <string name="right_parenthese">)</string>
+    <string name="divided">/</string>
+    <string name="seven">7</string>
+    <string name="eight">8</string>
+    <string name="nine">9</string>
+    <string name="multiplied">X</string>
+    <string name="four">4</string>
+    <string name="five">5</string>
+    <string name="six">6</string>
+    <string name="minus">-</string>
+    <string name="one">1</string>
+    <string name="two">2</string>
+    <string name="three">3</string>
+    <string name="plus">+</string>
+    <string name="zero">0</string>
+    <string name="dot">.</string>
+    <string name="equal_to">=</string>
 </resources>