diff --git a/src/com/annimon/ownlang/lib/modules/math.java b/src/com/annimon/ownlang/lib/modules/math.java
index dca7594..b549ea7 100644
--- a/src/com/annimon/ownlang/lib/modules/math.java
+++ b/src/com/annimon/ownlang/lib/modules/math.java
@@ -4,44 +4,46 @@ import com.annimon.ownlang.lib.*;
 import java.util.function.DoubleBinaryOperator;
 import java.util.function.DoubleFunction;
 import java.util.function.DoubleUnaryOperator;
+import java.util.function.UnaryOperator;
 
 /**
  *
  * @author aNNiMON
  */
 public final class math implements Module {
-    
+
     private static final DoubleFunction<NumberValue> doubleToNumber = NumberValue::of;
 
     @Override
     public void init() {
-        Functions.set("abs", functionConvert(Math::abs));
+        Functions.set("abs", math::abs);
         Functions.set("acos", functionConvert(Math::acos));
         Functions.set("asin", functionConvert(Math::asin));
         Functions.set("atan", functionConvert(Math::atan));
         Functions.set("atan2", biFunctionConvert(Math::atan2));
         Functions.set("cbrt", functionConvert(Math::cbrt));
         Functions.set("ceil", functionConvert(Math::ceil));
-        Functions.set("copySign", biFunctionConvert(Math::copySign));
+        Functions.set("copySign", math::copySign);
         Functions.set("cos", functionConvert(Math::cos));
         Functions.set("cosh", functionConvert(Math::cosh));
         Functions.set("exp", functionConvert(Math::exp));
         Functions.set("expm1", functionConvert(Math::expm1));
         Functions.set("floor", functionConvert(Math::floor));
-        Functions.set("getExponent", functionConvert(Math::getExponent));
+        Functions.set("getExponent", math::getExponent);
         Functions.set("hypot", biFunctionConvert(Math::hypot));
         Functions.set("IEEEremainder", biFunctionConvert(Math::IEEEremainder));
         Functions.set("log", functionConvert(Math::log));
         Functions.set("log1p", functionConvert(Math::log1p));
         Functions.set("log10", functionConvert(Math::log10));
-        Functions.set("max", biFunctionConvert(Math::max));
-        Functions.set("min", biFunctionConvert(Math::min));
-        Functions.set("nextAfter", biFunctionConvert(Math::nextAfter));
-        Functions.set("nextUp", functionConvert(Math::nextUp));
+        Functions.set("max", math::max);
+        Functions.set("min", math::min);
+        Functions.set("nextAfter", math::nextAfter);
+        Functions.set("nextUp", functionConvert(Math::nextUp, Math::nextUp));
+        Functions.set("nextDown", functionConvert(Math::nextDown, Math::nextDown));
         Functions.set("pow", biFunctionConvert(Math::pow));
         Functions.set("rint", functionConvert(Math::rint));
-        Functions.set("round", functionConvert(Math::round));
-        Functions.set("signum", functionConvert(Math::signum));
+        Functions.set("round", math::round);
+        Functions.set("signum", functionConvert(Math::signum, Math::signum));
         Functions.set("sin", functionConvert(Math::sin));
         Functions.set("sinh", functionConvert(Math::sinh));
         Functions.set("sqrt", functionConvert(Math::sqrt));
@@ -49,19 +51,112 @@ public final class math implements Module {
         Functions.set("tanh", functionConvert(Math::tanh));
         Functions.set("toDegrees", functionConvert(Math::toDegrees));
         Functions.set("toRadians", functionConvert(Math::toRadians));
-        Functions.set("ulp", functionConvert(Math::ulp));
+        Functions.set("ulp", functionConvert(Math::ulp, Math::ulp));
 
         Variables.set("PI", NumberValue.of(Math.PI));
         Variables.set("E", NumberValue.of(Math.E));
     }
-    
+
+    private static Value abs(Value... args) {
+        Arguments.check(1, args.length);
+        final Object raw = args[0].raw();
+        if (raw instanceof Double) {
+            return NumberValue.of(Math.abs((double) raw));
+        }
+        if (raw instanceof Float) {
+            return NumberValue.of(Math.abs((float) raw));
+        }
+        if (raw instanceof Long) {
+            return NumberValue.of(Math.abs((long) raw));
+        }
+        return NumberValue.of(Math.abs(args[0].asInt()));
+    }
+
+    private static Value copySign(Value... args) {
+        Arguments.check(2, args.length);
+        final Object raw = args[0].raw();
+        if (raw instanceof Float) {
+            return NumberValue.of(Math.copySign((float) raw, ((NumberValue) args[1]).asFloat()));
+        }
+        return NumberValue.of(Math.copySign(args[0].asNumber(), args[1].asNumber()));
+    }
+
+    private static Value getExponent(Value... args) {
+        Arguments.check(1, args.length);
+        final Object raw = args[0].raw();
+        if (raw instanceof Float) {
+            return NumberValue.of(Math.getExponent((float) raw));
+        }
+        return NumberValue.of(Math.getExponent(args[0].asNumber()));
+    }
+
+    private static Value max(Value... args) {
+        Arguments.check(2, args.length);
+        final Object raw = args[0].raw();
+        if (raw instanceof Double) {
+            return NumberValue.of(Math.max((double) raw, args[1].asNumber()));
+        }
+        if (raw instanceof Float) {
+            return NumberValue.of(Math.max((float) raw, ((NumberValue) args[1]).asFloat()));
+        }
+        if (raw instanceof Long) {
+            return NumberValue.of(Math.max((long) raw, ((NumberValue) args[1]).asLong()));
+        }
+        return NumberValue.of(Math.max(args[0].asInt(), args[1].asInt()));
+    }
+
+    private static Value min(Value... args) {
+        Arguments.check(2, args.length);
+        final Object raw = args[0].raw();
+        if (raw instanceof Double) {
+            return NumberValue.of(Math.min((double) raw, args[1].asNumber()));
+        }
+        if (raw instanceof Float) {
+            return NumberValue.of(Math.min((float) raw, ((NumberValue) args[1]).asFloat()));
+        }
+        if (raw instanceof Long) {
+            return NumberValue.of(Math.min((long) raw, ((NumberValue) args[1]).asLong()));
+        }
+        return NumberValue.of(Math.min(args[0].asInt(), args[1].asInt()));
+    }
+
+    private static Value nextAfter(Value... args) {
+        Arguments.check(2, args.length);
+        final Object raw = args[0].raw();
+        if (raw instanceof Float) {
+            return NumberValue.of(Math.nextAfter((float) raw, args[1].asNumber()));
+        }
+        return NumberValue.of(Math.nextAfter(args[0].asNumber(), args[1].asNumber()));
+    }
+
+    private static Value round(Value... args) {
+        Arguments.check(1, args.length);
+        final Object raw = args[0].raw();
+        if (raw instanceof Float) {
+            return NumberValue.of(Math.round((float) raw));
+        }
+        return NumberValue.of(Math.round(args[0].asNumber()));
+    }
+
+
     private static Function functionConvert(DoubleUnaryOperator op) {
         return args -> {
             Arguments.check(1, args.length);
             return doubleToNumber.apply(op.applyAsDouble(args[0].asNumber()));
         };
     }
-    
+
+     private static Function functionConvert(DoubleUnaryOperator opDouble, UnaryOperator<Float> opFloat) {
+        return args -> {
+            Arguments.check(1, args.length);
+            final Object raw = args[0].raw();
+            if (raw instanceof Float) {
+                return NumberValue.of(opFloat.apply((float) raw));
+            }
+            return NumberValue.of(opDouble.applyAsDouble(args[0].asNumber()));
+        };
+    }
+
     private static Function biFunctionConvert(DoubleBinaryOperator op) {
         return args -> {
             Arguments.check(2, args.length);