diff --git a/app/src/main/res/layout/content_numpad.xml b/app/src/main/res/layout/content_numpad.xml
deleted file mode 100644
index 91dd84e..0000000
--- a/app/src/main/res/layout/content_numpad.xml
+++ /dev/null
@@ -1,73 +0,0 @@
-<?xml version="1.0" encoding="utf-8"?>
-<!--
-  ~ Copyright (C) 2016 Phillip Hsu
-  ~
-  ~ Licensed under the Apache License, Version 2.0 (the "License");
-  ~ you may not use this file except in compliance with the License.
-  ~ You may obtain a copy of the License at
-  ~
-  ~      http://www.apache.org/licenses/LICENSE-2.0
-  ~
-  ~ Unless required by applicable law or agreed to in writing, software
-  ~ distributed under the License is distributed on an "AS IS" BASIS,
-  ~ WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-  ~ See the License for the specific language governing permissions and
-  ~ limitations under the License.
-  -->
-
-<merge xmlns:android="http://schemas.android.com/apk/res/android">
-
-    <!--
-      ~ The children of a TableLayout cannot specify the layout_width attribute.
-      ~ Width is always MATCH_PARENT. However, the layout_height attribute can be
-      ~ defined by a child; default value is WRAP_CONTENT. If the child is a
-      ~ TableRow, then the height is always WRAP_CONTENT.
-    -->
-
-   <TableRow>
-      <Button style="@style/NumberButton"
-              android:id="@+id/one"
-              android:text="@string/one"/>
-      <Button style="@style/NumberButton"
-              android:id="@+id/two"
-              android:text="@string/two"/>
-      <Button style="@style/NumberButton"
-              android:id="@+id/three"
-              android:text="@string/three"/>
-   </TableRow>
-
-   <TableRow>
-      <Button style="@style/NumberButton"
-              android:id="@+id/four"
-              android:text="@string/four"/>
-      <Button style="@style/NumberButton"
-              android:id="@+id/five"
-              android:text="@string/five"/>
-      <Button style="@style/NumberButton"
-              android:id="@+id/six"
-              android:text="@string/six"/>
-   </TableRow>
-
-   <TableRow>
-      <Button style="@style/NumberButton"
-              android:id="@+id/seven"
-              android:text="@string/seven"/>
-      <Button style="@style/NumberButton"
-              android:id="@+id/eight"
-              android:text="@string/eight"/>
-      <Button style="@style/NumberButton"
-              android:id="@+id/nine"
-              android:text="@string/nine"/>
-   </TableRow>
-
-   <TableRow>
-      <Space android:layout_weight="1"
-             android:layout_height="match_parent"/>
-      <Button style="@style/NumberButton"
-              android:id="@+id/zero"
-              android:text="@string/zero"/>
-      <Space android:layout_weight="1"
-             android:layout_height="match_parent"/>
-   </TableRow>
-
-</merge>
\ No newline at end of file
diff --git a/app/src/main/res/layout/numpad_alt_button.xml b/app/src/main/res/layout/numpad_alt_button.xml
deleted file mode 100644
index 84859e2..0000000
--- a/app/src/main/res/layout/numpad_alt_button.xml
+++ /dev/null
@@ -1,18 +0,0 @@
-<?xml version="1.0" encoding="utf-8"?>
-<!--
-  ~ Copyright (C) 2016 Phillip Hsu
-  ~
-  ~ Licensed under the Apache License, Version 2.0 (the "License");
-  ~ you may not use this file except in compliance with the License.
-  ~ You may obtain a copy of the License at
-  ~
-  ~      http://www.apache.org/licenses/LICENSE-2.0
-  ~
-  ~ Unless required by applicable law or agreed to in writing, software
-  ~ distributed under the License is distributed on an "AS IS" BASIS,
-  ~ WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-  ~ See the License for the specific language governing permissions and
-  ~ limitations under the License.
-  -->
-
-<Button style="@style/NumberButton"/>
\ No newline at end of file
diff --git a/app/src/main/res/layout/numpad_backspace.xml b/app/src/main/res/layout/numpad_backspace.xml
deleted file mode 100644
index 476e5d4..0000000
--- a/app/src/main/res/layout/numpad_backspace.xml
+++ /dev/null
@@ -1,22 +0,0 @@
-<?xml version="1.0" encoding="utf-8"?>
-<!--
-  ~ Copyright (C) 2016 Phillip Hsu
-  ~
-  ~ Licensed under the Apache License, Version 2.0 (the "License");
-  ~ you may not use this file except in compliance with the License.
-  ~ You may obtain a copy of the License at
-  ~
-  ~      http://www.apache.org/licenses/LICENSE-2.0
-  ~
-  ~ Unless required by applicable law or agreed to in writing, software
-  ~ distributed under the License is distributed on an "AS IS" BASIS,
-  ~ WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-  ~ See the License for the specific language governing permissions and
-  ~ limitations under the License.
-  -->
-
-<ImageButton xmlns:android="http://schemas.android.com/apk/res/android"
-    style="@style/NumberButton"
-    android:src="@drawable/ic_backspace_24dp"
-    android:theme="@style/ThemeOverlay.AppCompat.Dark"
-    android:id="@+id/backspace"/>
\ No newline at end of file
diff --git a/app/src/main/res/layout/numpad_collapse.xml b/app/src/main/res/layout/numpad_collapse.xml
deleted file mode 100644
index 633b81c..0000000
--- a/app/src/main/res/layout/numpad_collapse.xml
+++ /dev/null
@@ -1,20 +0,0 @@
-<?xml version="1.0" encoding="utf-8"?>
-<!--
-  ~ Copyright (C) 2016 Phillip Hsu
-  ~
-  ~ Licensed under the Apache License, Version 2.0 (the "License");
-  ~ you may not use this file except in compliance with the License.
-  ~ You may obtain a copy of the License at
-  ~
-  ~      http://www.apache.org/licenses/LICENSE-2.0
-  ~
-  ~ Unless required by applicable law or agreed to in writing, software
-  ~ distributed under the License is distributed on an "AS IS" BASIS,
-  ~ WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-  ~ See the License for the specific language governing permissions and
-  ~ limitations under the License.
-  -->
-
-<ImageButton xmlns:android="http://schemas.android.com/apk/res/android"
-             style="@style/NumberButton"
-    android:src="@drawable/ic_collapse_24dp"/>
\ No newline at end of file
diff --git a/app/src/main/res/layout/numpad_fab.xml b/app/src/main/res/layout/numpad_fab.xml
deleted file mode 100644
index 46f3f11..0000000
--- a/app/src/main/res/layout/numpad_fab.xml
+++ /dev/null
@@ -1,30 +0,0 @@
-<?xml version="1.0" encoding="utf-8"?>
-<!--
-  ~ Copyright (C) 2016 Phillip Hsu
-  ~
-  ~ Licensed under the Apache License, Version 2.0 (the "License");
-  ~ you may not use this file except in compliance with the License.
-  ~ You may obtain a copy of the License at
-  ~
-  ~      http://www.apache.org/licenses/LICENSE-2.0
-  ~
-  ~ Unless required by applicable law or agreed to in writing, software
-  ~ distributed under the License is distributed on an "AS IS" BASIS,
-  ~ WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-  ~ See the License for the specific language governing permissions and
-  ~ limitations under the License.
-  -->
-
-<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
-             style="@style/NumberButton"
-             android:padding="0dp"
-             android:background="@android:color/transparent">
-
-    <android.support.design.widget.FloatingActionButton
-        android:layout_width="wrap_content"
-        android:layout_height="wrap_content"
-        android:src="@drawable/ic_done_24dp"
-        android:layout_gravity="center"
-        android:clickable="true"/>
-
-</FrameLayout>
\ No newline at end of file