How do these stats work

On the stats page on my character there is a crit strike damage/ crit strike with core skills/ crit strike with bone damage. How does that work? lets say i have 100 of each crit mentioned. Does that mean my Bone spear will crit damage for 300% more? Im pretty confused about this topic and most ppl I ask dont know either so if anyone can shine some light on this that be awesome!