The basic principle of point spreads and totals is that you have roughly a 50% chance of winning, so technically a "fair" return on these types of wagers should be equal to the amount staked. However, they are usually priced up by bookmakers at odds of -110 (1.91 in decimal odds format, 10/11 in fractional odds format), which means for every $110 staked you stand to win $100. You don't have to stake as much as $110 of course, but the point is that a successful wager will only return 90% of the amount staked (plus the initial stake of course).

Here you can see that the Rams are +3.5, while the Cowboys are -3.5.  So for this example the Cowboys are 3.5 point favorites, while the Rams are underdogs of 3.5 points.  If you were to bet on St Louis you would need them to lose by 3 or fewer points or just win the game outright.  If you were to bet on Dallas you would need the Cowboys to win by 4 or more points.

Last week, we went over how to read sports betting odds and covered the most common items you'll see on a betting board inside a sportsbook (or on your screen with your online sportsbook). These included point spreads and totals. When betting these choices, you will almost always see -110 listed with them. If you don't know what that means, don't worry - we're covering that today and it's not nearly as complicated as it looks. Whether you're brand new to betting, have placed some bets but have disregarded the -110, or live outside the United States and are unfamiliar with American odds, you'll be an expert in no time after reading.
The key here is to target the point spread five and seven, because these are virtually tied as the most common margins of victory. It's important to recognize that most betting sites are only willing to sell 2 or 3 half points for 10 cents each, after which point they start charging more. Some sites sell up to four half points at this price though.
Especially in major tournaments, some sports books offer odds on unusual golf propositions, such as the over/under on the winning score, the over/under on the lowest round by any golfer or the over/under on the finishing position by a particular golfer. For example, the over/under on Woods' finishing position may be 3 1/2. If he finishes first, second or third in the tournament, the "under" wins; if he finishes fourth or worse, the "over" tickets cash.
There's a full-field wager, which resembles a line you'd see in a horse race. Jimmie Johnson would be 6-1 to win the race, meaning if you bet $1, you profit $6, meaning your ticket would be worth $7. There will be a pool of available participants, with the rest being put into a "field" category, giving you more individual chances to have a winning ticket, but typically with less unexpected winners.
Point Spread: The point spread remains the favorite way to wager on pro football, regardless of how many new forms of wagering come on stream. It’s called the line or spread and it’s known as betting ‘sides.’ The common misconception is that Las Vegas sets the spread as its best guess at the margin of victory. But really, it's a number they feel that is a perfect balance and will see an equal number of people to bet the underdog as on the favorite. A negative value like -6.5 means that team is favored by 6.5 points. So deduct 6.5 points from their total score. A positive value on the same game would be +6.5 (add 6.5 points to their final score) and would make that team an underdog of 6.5 points. The favorite must win by at least seven points to cover the spread. The underdog can lose by six points and still cover.