diff --git a/lib/dgram.js b/lib/dgram.js
index 2db146886575e8..1e151edad0c78c 100644
--- a/lib/dgram.js
+++ b/lib/dgram.js
@@ -37,7 +37,10 @@ const {
   ERR_SOCKET_CANNOT_SEND,
   ERR_SOCKET_DGRAM_NOT_RUNNING
 } = errors.codes;
-const { validateString } = require('internal/validators');
+const {
+  validateString,
+  validateNumber
+} = require('internal/validators');
 const { Buffer } = require('buffer');
 const util = require('util');
 const { isUint8Array } = require('internal/util/types');
@@ -258,18 +261,9 @@ Socket.prototype.sendto = function(buffer,
                                    port,
                                    address,
                                    callback) {
-  if (typeof offset !== 'number') {
-    throw new ERR_INVALID_ARG_TYPE('offset', 'number', offset);
-  }
-
-  if (typeof length !== 'number') {
-    throw new ERR_INVALID_ARG_TYPE('length', 'number', length);
-  }
-
-  if (typeof port !== 'number') {
-    throw new ERR_INVALID_ARG_TYPE('port', 'number', port);
-  }
-
+  validateNumber(offset, 'offset');
+  validateNumber(length, 'length');
+  validateNumber(port, 'port');
   validateString(address, 'address');
 
   this.send(buffer, offset, length, port, address, callback);
@@ -530,9 +524,7 @@ Socket.prototype.setBroadcast = function(arg) {
 
 
 Socket.prototype.setTTL = function(ttl) {
-  if (typeof ttl !== 'number') {
-    throw new ERR_INVALID_ARG_TYPE('ttl', 'number', ttl);
-  }
+  validateNumber(ttl, 'ttl');
 
   var err = this[kStateSymbol].handle.setTTL(ttl);
   if (err) {
@@ -544,9 +536,7 @@ Socket.prototype.setTTL = function(ttl) {
 
 
 Socket.prototype.setMulticastTTL = function(ttl) {
-  if (typeof ttl !== 'number') {
-    throw new ERR_INVALID_ARG_TYPE('ttl', 'number', ttl);
-  }
+  validateNumber(ttl, 'ttl');
 
   var err = this[kStateSymbol].handle.setMulticastTTL(ttl);
   if (err) {
diff --git a/lib/internal/buffer.js b/lib/internal/buffer.js
index 085a82265a95de..3a944a13de3031 100644
--- a/lib/internal/buffer.js
+++ b/lib/internal/buffer.js
@@ -3,9 +3,9 @@
 const binding = process.binding('buffer');
 const {
   ERR_BUFFER_OUT_OF_BOUNDS,
-  ERR_INVALID_ARG_TYPE,
   ERR_OUT_OF_RANGE
 } = require('internal/errors').codes;
+const { validateNumber } = require('internal/validators');
 const { setupBufferJS } = binding;
 
 // Remove from the binding so that function is only available as exported here.
@@ -38,9 +38,7 @@ function checkInt(value, min, max, buf, offset, byteLength) {
 }
 
 function checkNumberType(value, type) {
-  if (typeof value !== 'number') {
-    throw new ERR_INVALID_ARG_TYPE(type || 'offset', 'number', value);
-  }
+  validateNumber(value, type || 'offset');
 }
 
 function boundsError(value, length, type) {
diff --git a/lib/internal/crypto/random.js b/lib/internal/crypto/random.js
index 15fbc37c2239d7..ea73c85ec5dbf0 100644
--- a/lib/internal/crypto/random.js
+++ b/lib/internal/crypto/random.js
@@ -8,16 +8,14 @@ const {
   ERR_INVALID_CALLBACK,
   ERR_OUT_OF_RANGE
 } = require('internal/errors').codes;
+const { validateNumber } = require('internal/validators');
 const { isArrayBufferView } = require('internal/util/types');
 
 const kMaxUint32 = 2 ** 32 - 1;
 const kMaxPossibleLength = Math.min(kMaxLength, kMaxUint32);
 
 function assertOffset(offset, elementSize, length) {
-  if (typeof offset !== 'number') {
-    throw new ERR_INVALID_ARG_TYPE('offset', 'number', offset);
-  }
-
+  validateNumber(offset, 'offset');
   offset *= elementSize;
 
   const maxLength = Math.min(length, kMaxPossibleLength);
@@ -29,10 +27,7 @@ function assertOffset(offset, elementSize, length) {
 }
 
 function assertSize(size, elementSize, offset, length) {
-  if (typeof size !== 'number') {
-    throw new ERR_INVALID_ARG_TYPE('size', 'number', size);
-  }
-
+  validateNumber(size, 'size');
   size *= elementSize;
 
   if (Number.isNaN(size) || size > kMaxPossibleLength || size < 0) {
diff --git a/lib/internal/http2/core.js b/lib/internal/http2/core.js
index 30c401774f10a3..e1eb8b517a5e56 100644
--- a/lib/internal/http2/core.js
+++ b/lib/internal/http2/core.js
@@ -75,6 +75,7 @@ const {
     ERR_SOCKET_CLOSED
   }
 } = require('internal/errors');
+const { validateNumber } = require('internal/validators');
 const { utcDate } = require('internal/http');
 const { onServerStream,
         Http2ServerRequest,
@@ -1001,8 +1002,7 @@ class Http2Session extends EventEmitter {
     if (this.destroyed)
       throw new ERR_HTTP2_INVALID_SESSION();
 
-    if (typeof id !== 'number')
-      throw new ERR_INVALID_ARG_TYPE('id', 'number', id);
+    validateNumber(id, 'id');
     if (id <= 0 || id > kMaxStreams)
       throw new ERR_OUT_OF_RANGE('id', `> 0 and <= ${kMaxStreams}`, id);
     this[kHandle].setNextStreamID(id);
@@ -1144,12 +1144,8 @@ class Http2Session extends EventEmitter {
                                      ['Buffer', 'TypedArray', 'DataView'],
                                      opaqueData);
     }
-    if (typeof code !== 'number') {
-      throw new ERR_INVALID_ARG_TYPE('code', 'number', code);
-    }
-    if (typeof lastStreamID !== 'number') {
-      throw new ERR_INVALID_ARG_TYPE('lastStreamID', 'number', lastStreamID);
-    }
+    validateNumber(code, 'code');
+    validateNumber(lastStreamID, 'lastStreamID');
 
     const goawayFn = submitGoaway.bind(this, code, lastStreamID, opaqueData);
     if (this.connecting) {
@@ -1831,8 +1827,7 @@ class Http2Stream extends Duplex {
   // close, it is still possible to queue up PRIORITY and RST_STREAM frames,
   // but no DATA and HEADERS frames may be sent.
   close(code = NGHTTP2_NO_ERROR, callback) {
-    if (typeof code !== 'number')
-      throw new ERR_INVALID_ARG_TYPE('code', 'number', code);
+    validateNumber(code, 'code');
     if (code < 0 || code > kMaxInt)
       throw new ERR_OUT_OF_RANGE('code', `>= 0 && <= ${kMaxInt}`, code);
     if (callback !== undefined && typeof callback !== 'function')
@@ -2326,8 +2321,7 @@ class ServerHttp2Stream extends Http2Stream {
       this[kState].flags |= STREAM_FLAGS_HAS_TRAILERS;
     }
 
-    if (typeof fd !== 'number')
-      throw new ERR_INVALID_ARG_TYPE('fd', 'number', fd);
+    validateNumber(fd, 'fd');
 
     debug(`Http2Stream ${this[kID]} [Http2Session ` +
           `${sessionName(session[kType])}]: initiating response from fd`);
diff --git a/lib/internal/timers.js b/lib/internal/timers.js
index 801fce1cc369fd..d33ad0c8ac8027 100644
--- a/lib/internal/timers.js
+++ b/lib/internal/timers.js
@@ -11,10 +11,10 @@ const async_id_symbol = Symbol('asyncId');
 const trigger_async_id_symbol = Symbol('triggerId');
 
 const {
-  ERR_INVALID_ARG_TYPE,
   ERR_INVALID_CALLBACK,
   ERR_OUT_OF_RANGE
 } = require('internal/errors').codes;
+const { validateNumber } = require('internal/validators');
 
 // Timeout values > TIMEOUT_MAX are set to 1.
 const TIMEOUT_MAX = 2 ** 31 - 1;
@@ -130,10 +130,7 @@ function setUnrefTimeout(callback, after, arg1, arg2, arg3) {
 
 // Type checking used by timers.enroll() and Socket#setTimeout()
 function validateTimerDuration(msecs) {
-  if (typeof msecs !== 'number') {
-    throw new ERR_INVALID_ARG_TYPE('msecs', 'number', msecs);
-  }
-
+  validateNumber(msecs, 'msecs');
   if (msecs < 0 || !isFinite(msecs)) {
     throw new ERR_OUT_OF_RANGE('msecs', 'a non-negative finite number', msecs);
   }
diff --git a/lib/internal/validators.js b/lib/internal/validators.js
index 85e69e61255d58..0ecf286266678a 100644
--- a/lib/internal/validators.js
+++ b/lib/internal/validators.js
@@ -125,6 +125,11 @@ function validateString(value, name) {
     throw new ERR_INVALID_ARG_TYPE(name, 'string', value);
 }
 
+function validateNumber(value, name) {
+  if (typeof value !== 'number')
+    throw new ERR_INVALID_ARG_TYPE(name, 'number', value);
+}
+
 module.exports = {
   isInt32,
   isUint32,
@@ -132,5 +137,6 @@ module.exports = {
   validateInteger,
   validateInt32,
   validateUint32,
-  validateString
+  validateString,
+  validateNumber
 };
diff --git a/lib/util.js b/lib/util.js
index 8b58b901eb78d3..94bde6e65ee055 100644
--- a/lib/util.js
+++ b/lib/util.js
@@ -27,6 +27,7 @@ const {
   ERR_INVALID_ARG_TYPE,
   ERR_OUT_OF_RANGE
 } = errors.codes;
+const { validateNumber } = require('internal/validators');
 const { TextDecoder, TextEncoder } = require('internal/encoding');
 const { isBuffer } = require('buffer').Buffer;
 
@@ -1431,9 +1432,7 @@ function callbackify(original) {
 }
 
 function getSystemErrorName(err) {
-  if (typeof err !== 'number') {
-    throw new ERR_INVALID_ARG_TYPE('err', 'number', err);
-  }
+  validateNumber(err, 'err');
   if (err >= 0 || !Number.isSafeInteger(err)) {
     throw new ERR_OUT_OF_RANGE('err', 'a negative integer', err);
   }