For my DD it depends on what the tantrum is about. If its because she wanted something like 'ice cream ' and I said no and its just a tantrum to see if I might give in then I will ignore it. However, I often find that many of the tantrums she has are about her feeling out of control with her emotions. For me to walk away from her when she is in need of my help doesn't help her. I will ask her if she needs a cuddle, if she does, I give her one then when she has calmed down, we talk about what is going on for her. If she doesn't want a cuddle, i just sit by her and let her know I am there for her. Showing her kindness through her emotional melt downs has lessened the amount of tantrums she has. Also, I try to predict when a situation may cause one, like boredom, hunger, etc and head it off before it happens. Easier said then done somedays.