Since this word consists of a kanji with hiragana attached, you can bet that it will use the kun'yomi reading. You didn't learn that reading with this kanji, so here's a mnemonic to help you:
You have to remember the ま portion. Who would mix things for you (like cakes and other goodies) growing up? That would be your Ma (ま).
Mix the cards up well, please.
Why did you mix one woman into group with a bunch of men?
It’s dangerous to mix tofu and puffer fish.