diff --git a/js/js.tests/test/org/jetbrains/k2js/test/semantics/NumberTest.java b/js/js.tests/test/org/jetbrains/k2js/test/semantics/NumberTest.java
index 08e33c233e7..ef2424882f7 100644
--- a/js/js.tests/test/org/jetbrains/k2js/test/semantics/NumberTest.java
+++ b/js/js.tests/test/org/jetbrains/k2js/test/semantics/NumberTest.java
@@ -33,4 +33,8 @@ public final class NumberTest extends SingleFileTranslationTest {
     public void testDoubleConversions() throws Exception {
         fooBoxTest();
     }
+
+    public void testNumberConversions() throws Exception {
+        fooBoxTest();
+    }
 }
diff --git a/js/js.translator/src/org/jetbrains/k2js/translate/intrinsic/functions/factories/NumberConversionFIF.java b/js/js.translator/src/org/jetbrains/k2js/translate/intrinsic/functions/factories/NumberConversionFIF.java
index afcc9070ab5..e74a3b2ac54 100644
--- a/js/js.translator/src/org/jetbrains/k2js/translate/intrinsic/functions/factories/NumberConversionFIF.java
+++ b/js/js.translator/src/org/jetbrains/k2js/translate/intrinsic/functions/factories/NumberConversionFIF.java
@@ -27,8 +27,8 @@ import org.jetbrains.k2js.translate.intrinsic.functions.basic.CallStandardMethod
 import org.jetbrains.k2js.translate.intrinsic.functions.basic.FunctionIntrinsic;
 import org.jetbrains.k2js.translate.intrinsic.functions.patterns.NameChecker;
 
-import java.util.HashSet;
 import java.util.List;
+import java.util.Set;
 
 import static org.jetbrains.jet.lang.types.expressions.OperatorConventions.*;
 import static org.jetbrains.k2js.translate.intrinsic.functions.patterns.PatternBuilder.pattern;
@@ -41,7 +41,7 @@ public final class NumberConversionFIF {
     private static final NameChecker SUPPORTED_CONVERSIONS;
 
     static {
-        HashSet<Name> supportedConversions = Sets.newHashSet(NUMBER_CONVERSIONS);
+        Set<Name> supportedConversions = Sets.newHashSet(NUMBER_CONVERSIONS);
         //TODO: support longs and chars
         supportedConversions.remove(CHAR);
         supportedConversions.remove(LONG);
@@ -71,8 +71,8 @@ public final class NumberConversionFIF {
     @NotNull
     public static final FunctionIntrinsicFactory INSTANCE = FIFBuilder.start()
             .add(pattern("Int", SUPPORTED_CONVERSIONS), RETURN_RECEIVER)
-            .add(pattern("Double", INTEGER_CONVERSIONS), new CallStandardMethodIntrinsic("Math.floor", true, 0))
-            .add(pattern("Double", FLOATING_POINT_CONVERSIONS), RETURN_RECEIVER)
+            .add(pattern("Double|Number", INTEGER_CONVERSIONS), new CallStandardMethodIntrinsic("Math.floor", true, 0))
+            .add(pattern("Double|Number", FLOATING_POINT_CONVERSIONS), RETURN_RECEIVER)
             .build();
 
     private NumberConversionFIF() {
diff --git a/js/js.translator/testFiles/number/cases/numberConversions.kt b/js/js.translator/testFiles/number/cases/numberConversions.kt
new file mode 100644
index 00000000000..3fb6b67abe8
--- /dev/null
+++ b/js/js.translator/testFiles/number/cases/numberConversions.kt
@@ -0,0 +1,42 @@
+package foo
+
+fun testIntegerConversions(c: Number): Boolean {
+    if (c.toDouble() != 3.0) {
+        return false
+    }
+    if (c.toFloat() != 3.toFloat()) {
+        return false
+    }
+    if (c.toByte() != 3.toByte()) {
+        return false
+    }
+    if (c.toInt() != 3) {
+        return false
+    }
+    if (c.toShort() != 3.toShort()) {
+        return false
+    }
+    return true
+}
+
+fun testFloatingPointConversions(c: Number): Boolean {
+    if (c.toDouble() != 3.6) {
+        return false
+    }
+    if (c.toFloat() != 3.6.toFloat()) {
+        return false
+    }
+    if (c.toByte() != 3.toByte()) {
+        return false
+    }
+    if (c.toInt() != 3) {
+        return false
+    }
+    if (c.toShort() != 3.toShort()) {
+        return false
+    }
+    return true
+}
+
+fun box(): Boolean = testIntegerConversions(3) && testFloatingPointConversions(3.6) && testFloatingPointConversions(3.6.toFloat()) &&
+ testIntegerConversions(3.toByte()) && testIntegerConversions(3.toShort())
\ No newline at end of file