In addition to the spread bet, a very common "side bet" on an event is the total (commonly called the over/under or O/U) bet. This is a bet on the total number of points scored by both teams. Suppose team A is playing team B and the total is set at 44.5 points. If the final score is team A 24, team B 17, the total is 41 and bettors who took the under will win. If the final score is team A 30, team B 31, the total is 61 and bettors who took the over will win. The total is popular because it allows gamblers to bet on their overall perception of the game (e.g., a high-scoring offensive show or a defensive battle) without needing to pick the actual winner.
The 3-digit numbers to the far right are the listed prices for these bets.  This is also called the odds, vig, or juice.  An easy way to think of it is the amount you must risk to win $100 on this wager.  In our example, -110 means you must risk $110 if you want to win $100.  -110 is pretty standard, but you will find different options.  We will cover those in more depth when we talk about money lines.  The price of the bet has no impact on which team is favored.  Only the plus or minus on the point spread matters.  This is handled differently when you bet strictly on the moneyline.
Odds for different outcomes in single bet are presented either in European format (decimal odds), UK format (fractional odds), or American format (moneyline odds). European format (decimal odds) are used in continental Europe, Canada, and Australia. They are the ratio of the full payout to the stake, in a decimal format. Decimal odds of 2.00 are an even bet. UK format (fractional odds) are used by British bookmakers. They are the ratio of the amount won to the stake - the solidus "/" is pronounced "to" for example 7/1 "seven to one". Fractional odds of 1/1 are an even bet. US format odds are the amount won on a 100 stake when positive and the stake needed to win 100 when negative. US odds of 100 are an even bet.
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.
Sports spread betting began in the United Kingdom in the late 1980s to offer an alternative form of sports wagering to traditional fixed odds, or fixed-risk, betting. With fixed odds betting, a gambler places a fixed-risk stake on stated fractional or decimal odds on the outcome of a sporting event that would give a known return for that outcome occurring or a known loss if that outcome doesn’t occur (the initial stake). With sports spread betting, gamblers are instead betting on whether a specified outcome in a sports event will end up being above or below a ‘spread’ offered by a sports spread betting firm, with profits or losses determined by how much above or below the spread the final outcome finishes at.
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