It depends on the game and on the keno rules. In most keno games with a maximum of 10 selections, you need to match at least three to win. The more numbers you match, the higher the payout.
Try to guess as many out of 10 as possible. Buy way keno cards if you want to bet on groups of numbers as well as individual spots. If you match multiple numbers in your group, you earn more money. To increase your jackpot, bet on additional bonus numbers.