Transform Doubles to Integers? TweenSize with Doubles?

I am designing an HP bar that works depending on a player's current Health and MaxHealth, and it Tweens the bar's size to smoothen the changes...

The only problem is my TweenSize code doesn't work, and just gives a "Unable to cast double to token" error message.

CODE :

player = game.Players.LocalPlayer
char = player.Character
human = char.Humanoid
HP = script.Parent

while wait(.1) do
    HP:TweenSize(UDim2.new(0, (human.Health*311)/human.MaxHealth), 0, 24)
end

Any help is appreciated!

• TheArmoredReaper