How do i use multiplication in a macro?

I checked the forum wiki and found nothing on this. I want this macro to multiply my coins. How do i do this?  /w gm &{template:npcaction} {{rname= Coins}} {{description=**Treasure** [[4d6 x 100]] [[1t[TCopperCoins]]] [[6d6 x 10]] [[1t[TSilverCoins]]]  [[3d6 x 10]] [[1t[TElectrumCoins]]]  [[4d6 x 10]] [[1t[TGoldCoins]]] [[2d6 x 10]] [[1t[TPlatinumCoins]]]}}

replace the x with * and close any gap between the numbers and that should do it. [[4d6*100]]

Here is a list of math operators.

Thank You!