You might remember the one radical with this easy mnemonic:
This radical means <strong>one</strong>. Why? Because there's only one stroke. Ever heard of the saying, "if it looks like a duck, swims like a duck, and quacks like a duck, then it probably is a duck"? Exactly.
Using mnemonics to remember Chinese radicals like one has a huge impact on how long to learn Mandarin it takes.