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Even better if the foe was already almost dead. When you slap something for huge numbers it's also fun having the DM describe the wreckage that's left of your opponents.
I feel like some Table Top games are more prone to this than others, just based off watching some different IP's being played.
My first fireball felt so good. All the little math rocks bringing their 30 hp of damage.
Now that you mention it, that's probably one of the best ways to teach the basics. It's so much more fun when it's roasting baddies as opposed to counting apples.
Hell yeah. I'm so much better at basic addition and subtraction now.