Help with naming hydrocarbons?

I know how to name hydrocarbons but I need to be able to name them quickly. So do you know any tricks or short cut on naming the or at least a website that has practice problems with naming them by looking at a lewis structures.

I only need to be able to name alkanes,alkenes, and alkynes

Answer:
The prefixes are all based on the number of carbons except for the first 4, which are whimsical and just have to be memorized:

1 - methane (no alkene or alkyne)
2 - eth-
3 - prop-
4 - but-

then:
5 - pent-
6 - hex-
7 - hept-
8 - oct-
9 - non-
10 - dec-

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