You might remember the meaning of the character 割 with this easy mnemonic:
Cut off my roof (宀) by one (一) or two (二) inches, till you reach this line (丨). But don't open your mouth (口) when you're cutting it or you might cut yourself with the razor (刂)!
Using mnemonics to remember the meaning of Chinese characters like has a huge impact on how long to learn Mandarin it takes.