Simplify the following text for a Grade 9 native English-speaking person.
Original: Antiquarks have the opposite charge to their corresponding quarks ; up-type antiquarks have charges of â ' and down-type antiquarks have charges of + .
Simplified: Antiquarks have a charge opposite to that of their quarks ; meaning that up , charm and top antiquarks have a charge of - and that down , strange and bottom antiquarks have a charge of + .