diff --git a/calculatorpp/res/values-ru/text_preferences.xml b/calculatorpp/res/values-ru/text_preferences.xml
index 2e8c8a67..683aabbc 100644
--- a/calculatorpp/res/values-ru/text_preferences.xml
+++ b/calculatorpp/res/values-ru/text_preferences.xml
@@ -4,4 +4,7 @@
 
     <string name="c_show_equals_button_title">Показывать клавишу равно</string>
     <string name="c_show_equals_button_summary">Если включено, то клавиша равно будет показана</string>
+
+    <string name="c_hide_numeral_base_digits_title">Не показывать цифры из других систем счисления</string>
+    <string name="c_hide_numeral_base_digits_summary">Если включено, то цифры из других систем счисления будут спрятаны</string>
 </resources>
\ No newline at end of file
diff --git a/calculatorpp/res/values-uk/text_preferences.xml b/calculatorpp/res/values-uk/text_preferences.xml
index 2e8c8a67..683aabbc 100644
--- a/calculatorpp/res/values-uk/text_preferences.xml
+++ b/calculatorpp/res/values-uk/text_preferences.xml
@@ -4,4 +4,7 @@
 
     <string name="c_show_equals_button_title">Показывать клавишу равно</string>
     <string name="c_show_equals_button_summary">Если включено, то клавиша равно будет показана</string>
+
+    <string name="c_hide_numeral_base_digits_title">Не показывать цифры из других систем счисления</string>
+    <string name="c_hide_numeral_base_digits_summary">Если включено, то цифры из других систем счисления будут спрятаны</string>
 </resources>
\ No newline at end of file
diff --git a/calculatorpp/res/values/text_preferences.xml b/calculatorpp/res/values/text_preferences.xml
index 955341ae..8f440c2f 100644
--- a/calculatorpp/res/values/text_preferences.xml
+++ b/calculatorpp/res/values/text_preferences.xml
@@ -4,4 +4,7 @@
 
     <string name="c_show_equals_button_title">Show equals button</string>
     <string name="c_show_equals_button_summary">If turned on equals button is shown</string>
+
+    <string name="c_hide_numeral_base_digits_title">Hide other numeral base digits</string>
+    <string name="c_hide_numeral_base_digits_summary">If turned on other numeral base digits base will be hidden</string>
 </resources>
\ No newline at end of file
diff --git a/calculatorpp/res/xml/preferences.xml b/calculatorpp/res/xml/preferences.xml
index 1d334547..5a279369 100644
--- a/calculatorpp/res/xml/preferences.xml
+++ b/calculatorpp/res/xml/preferences.xml
@@ -148,6 +148,13 @@
                 a:summary="@string/c_show_equals_button_summary"
                 a:defaultValue="true"/>
 
+        <android.preference.CheckBoxPreference
+                a:key="hideNumeralBaseDigits"
+                a:title="@string/c_hide_numeral_base_digits_title"
+                a:summary="@string/c_hide_numeral_base_digits_summary"
+                a:defaultValue="true"/>
+
+
 	</PreferenceScreen>
 
 	<PreferenceScreen
diff --git a/calculatorpp/src/main/java/org/solovyev/android/calculator/CalculatorPreferences.java b/calculatorpp/src/main/java/org/solovyev/android/calculator/CalculatorPreferences.java
index dd158c49..802d5816 100644
--- a/calculatorpp/src/main/java/org/solovyev/android/calculator/CalculatorPreferences.java
+++ b/calculatorpp/src/main/java/org/solovyev/android/calculator/CalculatorPreferences.java
@@ -36,6 +36,7 @@ public final class CalculatorPreferences {
         public static final Preference<Boolean> usePrevAsBack = new BooleanPreference("org.solovyev.android.calculator.CalculatorActivity_use_back_button_as_prev", false);
         public static final Preference<Boolean> showEqualsButton = new BooleanPreference("showEqualsButton", true);
         public static final Preference<Boolean> autoOrientation = new BooleanPreference("autoOrientation", true);
+        public static final Preference<Boolean> hideNumeralBaseDigits = new BooleanPreference("hideNumeralBaseDigits", true);
 
         public static enum Theme {
 
diff --git a/calculatorpp/src/main/java/org/solovyev/android/calculator/NumeralBaseButtons.java b/calculatorpp/src/main/java/org/solovyev/android/calculator/NumeralBaseButtons.java
index c2b7d088..ffc6b4d7 100644
--- a/calculatorpp/src/main/java/org/solovyev/android/calculator/NumeralBaseButtons.java
+++ b/calculatorpp/src/main/java/org/solovyev/android/calculator/NumeralBaseButtons.java
@@ -13,7 +13,7 @@ import org.solovyev.android.calculator.model.CalculatorEngine;
  */
 public class NumeralBaseButtons {
 
-    public synchronized void toggleNumericDigits(@NotNull Activity activity, @NotNull NumeralBase currentNumeralBase) {
+    private synchronized void toggleNumericDigits(@NotNull Activity activity, @NotNull NumeralBase currentNumeralBase) {
         for (NumeralBase numeralBase : NumeralBase.values()) {
             if ( currentNumeralBase != numeralBase ) {
                 AndroidNumeralBase.valueOf(numeralBase).toggleButtons(false, activity);
@@ -24,7 +24,12 @@ public class NumeralBaseButtons {
     }
 
     public synchronized void toggleNumericDigits(@NotNull Activity activity, @NotNull SharedPreferences preferences) {
-        final NumeralBase nb = CalculatorEngine.Preferences.numeralBase.getPreference(preferences);
-        this.toggleNumericDigits(activity, nb);
+        if (CalculatorPreferences.Gui.hideNumeralBaseDigits.getPreference(preferences)) {
+            final NumeralBase nb = CalculatorEngine.Preferences.numeralBase.getPreference(preferences);
+            this.toggleNumericDigits(activity, nb);
+        } else {
+            // set HEX to show all digits
+            AndroidNumeralBase.valueOf(NumeralBase.hex).toggleButtons(true, activity);
+        }
     }
 }