How would I make this rotation loop for a placing system more efficient?

Hi, so I have been making a placing system for a game, and got stuck at rotation. After trying for a bit, I got this. But it is extremely inefficient and is very long. Any idea on how to make it more efficient?

Edit: Specifically the floor's rotation loop

Edit2: "floorRot" is a number that gets added to the model's CFrame via CFrame.Angles() whilst placing

mouse.KeyDown:Connect(function(k)
	if k:lower() == "r" and script.Parent.Parent.Parent.IsPlacing.Value then
		if type then
			if type == "floor" then
				isRotating = true
				while isRotating do
					if floorRot == 0 then
						floorRot = 10
					elseif floorRot == 10 then
						floorRot = 20
					elseif floorRot == 20 then
						floorRot = 30
					elseif floorRot == 30 then
						floorRot = 40
					elseif floorRot == 40 then
						floorRot = 50
					elseif floorRot == 50 then
						floorRot = 60
					elseif floorRot == 60 then
						floorRot = 70
					elseif floorRot == 70 then
						floorRot = 80
					elseif floorRot == 80 then
						floorRot = 90
					elseif floorRot == 90 then
						floorRot = 100
					elseif floorRot == 100 then
						floorRot = 110
					elseif floorRot == 110 then
						floorRot = 120
					elseif floorRot == 120 then
						floorRot = 130
					elseif floorRot == 130 then
						floorRot = 140
					elseif floorRot == 140 then
						floorRot = 150
					elseif floorRot == 150 then
						floorRot = 160
					elseif floorRot == 160 then
						floorRot = 170
					elseif floorRot == 170 then
						floorRot = 180
					elseif floorRot == 180 then
						floorRot = -170
					elseif floorRot == -170 then
						floorRot = -160
					elseif floorRot == -160 then
						floorRot = -150
					elseif floorRot == -150 then
						floorRot = -140
					elseif floorRot == -140 then
						floorRot = -130
					elseif floorRot == -130 then
						floorRot = -120
					elseif floorRot == -120 then
						floorRot = -110
					elseif floorRot == -110 then
						floorRot = -100
					elseif floorRot == -100 then
						floorRot = -90
					elseif floorRot == -90 then
						floorRot = -80
					elseif floorRot == -80 then
						floorRot = -70
					elseif floorRot == -70 then
						floorRot = -60
					elseif floorRot == -60 then
						floorRot = -50
					elseif floorRot == -50 then
						floorRot = -40
					elseif floorRot == -40 then
						floorRot = -30
					elseif floorRot == -30 then
						floorRot = -20
					elseif floorRot == -20 then
						floorRot = -10
					elseif floorRot == -10 then
						floorRot = 0
					end
					wait(0.2)
				end
			elseif type == "wall" then
				if wallRot == 0 then
					wallRot = 90
				elseif wallRot == 90 then
					wallRot = 180
				elseif wallRot == 180 then
					wallRot = -90
				elseif wallRot == -90 then
					wallRot = 0
				end
			end
		end
		
	end
end)