> Most players use d10 pairs with a tens die, though, because they roll better.
There's also a nifty trick used in many RPGs based on d100 to roll once and have 2 d100 numbers (by inverting the result).
So for example in Warhammer you roll d100 for attack, you hit if your result is lower than your Melee Combat attribute, and the inverted result shows which part of the enemy body you hit (that influences critical hits and armor).
Most players use d10 pairs with a tens die, though, because they roll better.