diff --git a/src/js.rs b/src/js.rs
index d3a5a7bf0..aa7bb18a4 100644
--- a/src/js.rs
+++ b/src/js.rs
@@ -208,6 +208,41 @@ extern {
     pub fn entries(this: &Array) -> ArrayIterator;
 }
 
+// Number.
+#[wasm_bindgen]
+extern {
+    pub type Number;
+
+    /// The toLocaleString() method returns a string with a language sensitive
+    /// representation of this number.
+    ///
+    /// https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Number/toLocaleString
+    #[wasm_bindgen(method, js_name = toLocaleString)]
+    pub fn to_locale_string(this: &Number, locale: String) -> String;
+
+    /// The toPrecision() method returns a string representing the Number
+    /// object to the specified precision.
+    ///
+    /// https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Number/toPrecision
+    #[wasm_bindgen(catch, method, js_name = toPrecision)]
+    pub fn to_precision(this: &Number, precision: u8) -> Result<String, JsValue>;
+
+    /// The toString() method returns a string representing the
+    /// specified Number object.
+    ///
+    /// https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Number/toString
+    #[wasm_bindgen(catch, method, js_name = toString)]
+    pub fn to_string(this: &Number, radix: u8) -> Result<String, JsValue>;
+
+    /// The valueOf() method returns the wrapped primitive value of
+    /// a Number object.
+    ///
+    /// https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Number/valueOf
+    #[wasm_bindgen(method, js_name = valueOf)]
+    pub fn value_of(this: &Number) -> Number;
+
+}
+
 // Object.
 #[wasm_bindgen]
 extern {
@@ -275,4 +310,4 @@ extern {
     /// https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String/slice
     #[wasm_bindgen(method, js_class = "String")]
     pub fn slice(this: &JsString, start: u32, end: u32) -> JsString;
-}
\ No newline at end of file
+}
diff --git a/tests/all/js_globals/Number.rs b/tests/all/js_globals/Number.rs
new file mode 100644
index 000000000..da3083423
--- /dev/null
+++ b/tests/all/js_globals/Number.rs
@@ -0,0 +1,127 @@
+#![allow(non_snake_case)]
+
+use super::project;
+
+
+#[test]
+fn to_locale_string() {
+    project()
+        .file("src/lib.rs", r#"
+            #![feature(proc_macro, wasm_custom_section)]
+
+            extern crate wasm_bindgen;
+            use wasm_bindgen::prelude::*;
+            use wasm_bindgen::js;
+
+            #[wasm_bindgen]
+            pub fn to_locale_string(this: &js::Number, locale: String) -> String {
+                this.to_locale_string(locale)
+            }
+        "#)
+        .file("test.ts", r#"
+            import * as assert from "assert";
+            import * as wasm from "./out";
+
+            export function test() {
+                let number = 1234.45;
+                assert.equal(wasm.to_locale_string(number, "de-DE"), "1,234.45");
+                assert.equal(wasm.to_locale_string(number, "en-US"), "1,234.45");
+                assert.equal(wasm.to_locale_string(number, "zh-Hans-CN-u-nu-hanidec"), "1,234.45");
+            }
+        "#)
+        .test()
+}
+
+#[test]
+fn to_precision() {
+    project()
+        .file("src/lib.rs", r#"
+            #![feature(proc_macro, wasm_custom_section)]
+
+            extern crate wasm_bindgen;
+            use wasm_bindgen::prelude::*;
+            use wasm_bindgen::js;
+
+            #[wasm_bindgen]
+            pub fn to_precision(this: &js::Number, precision: u8) -> String {
+                let result = this.to_precision(precision);
+                let result = match result {
+                    Ok(num) => num,
+                    Err(_err) => "RangeError".to_string()
+                };
+                result
+            }
+        "#)
+        .file("test.ts", r#"
+            import * as assert from "assert";
+            import * as wasm from "./out";
+
+            export function test() {
+                assert.equal(wasm.to_precision(0.1, 3), "0.100");
+                assert.equal(wasm.to_precision(10, 101), "RangeError");
+            }
+        "#)
+        .test()
+}
+
+#[test]
+fn to_string() {
+    project()
+        .file("src/lib.rs", r#"
+            #![feature(proc_macro, wasm_custom_section)]
+
+            extern crate wasm_bindgen;
+            use wasm_bindgen::prelude::*;
+            use wasm_bindgen::js;
+
+            #[wasm_bindgen]
+            pub fn to_string(this: &js::Number, radix: u8) -> String {
+                let result = this.to_string(radix);
+                let result = match result {
+                    Ok(num) => num,
+                    Err(_err) => "RangeError".to_string()
+                };
+                result
+            }
+        "#)
+        .file("test.ts", r#"
+            import * as assert from "assert";
+            import * as wasm from "./out";
+
+            export function test() {
+                let number = 42;
+                assert.equal(wasm.to_string(number, 10), "42");
+                assert.equal(wasm.to_string(233, 16), "e9");
+                assert.equal(wasm.to_string(number, 100), "RangeError");
+            }
+        "#)
+        .test()
+}
+
+#[test]
+fn value_of() {
+    project()
+        .file("src/lib.rs", r#"
+            #![feature(proc_macro, wasm_custom_section)]
+
+            extern crate wasm_bindgen;
+            use wasm_bindgen::prelude::*;
+            use wasm_bindgen::js;
+
+            #[wasm_bindgen]
+            pub fn js_value_of(this: &js::Number) -> js::Number {
+                this.value_of()
+            }
+        "#)
+        .file("test.ts", r#"
+            import * as assert from "assert";
+            import * as wasm from "./out";
+
+            export function test() {
+                let number = 42;
+                assert.equal(wasm.js_value_of(number), 42);
+                assert.equal(typeof wasm.js_value_of(number), "number");
+            }
+        "#)
+        .test()
+}
diff --git a/tests/all/js_globals/mod.rs b/tests/all/js_globals/mod.rs
index b03c3ae43..25bacbc6d 100644
--- a/tests/all/js_globals/mod.rs
+++ b/tests/all/js_globals/mod.rs
@@ -6,6 +6,7 @@ mod Object;
 mod Array;
 mod ArrayIterator;
 mod JsString;
+mod Number;
 
 #[test]
 #[cfg(feature = "std")]