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Quick: What's 15 Percent of $129? Business is mainly about numbers. If you don't understand that, you have more than a math problem to solve.

By Gene Marks

entrepreneur daily

Opinions expressed by Entrepreneur contributors are their own.

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I've met lots of successful business owners and many of them share similar traits. Many are hardworking and optimistic. Many are also intelligent and creative. Some have a good way with people. Most lead with self-confidence. Others are disciplined and fair and goal-oriented. Not all of them share all of these characteristics. But there is one trait that they do share. Math.

Quick, what's 29 percent of $3.35? If you don't know that off the top of your head then your margin on a sale might be too low. Which means that the sales is not covering enough overhead, which in turn means you're losing money.

Quick, what's the average labor rate on your key machine? If you don't know that then that machine might be spewing out products at too high a cost.

Related: Mark Cuban's 3 'Smart Money Moves Everyone Should Make'

Quick, how much can you lower your price in a negotiation? If you don't know your break-even price then you could be selling product at a loss. If you know it, you'll know when to walk away.

Quick, how much would you need to increase your sales price if a raw material component goes up by 2 percent? Maybe you've got cushion. Maybe you don't.

Quick, how many chargeable hours per month do you need to generate a profit? If you don't know that then you don't know if you're on a profitable or losing track.

Quick, what percentage of your typical daily food delivery goes to spoilage? If you don't know that then you might be buying too much bread and those few dollars can kill your net profits.

Speaking of net profits, what are your net profits this month? What percentage of sales is that? How does that compare with your competitors down the street and around the country?

How fast is your inventory turning? What is your days cash on hand? How many days does a typical receivable stay unpaid? What's your return on assets? Your return on equity? Your sales per employee?

Related: 3 Money Mistakes You Must Fix to Get Rich

Do you know how to calculate these numbers? Better yet, can you quickly calculate these numbers in your head, on the fly, under pressure after 10 hours of being on your feet all day? Were you good in math at school? Are you the type of person who doesn't need a calculator to figure out a restaurant tip?

Running a successful business is about a lot of things. But mainly it's just about numbers. It's about knowing how to buy something for a buck and selling it for three. It's about calculating profit margins, turnover percentages and quick ratios. The most successful (and long-lasting) business owners I know are naturally good with numbers. They like numbers. They enjoy doing the math. They get daily reports showing them cash, sales, purchases and commitments. They dive into monthly analysis of their income statement and balance sheet. They are quick to calculate prices and always know what to sell for how much in order to profit.

Profit is a number. Cash is a number.

So, what if you're not good at numbers? Can you still be successful at business? You can, but you'll at a disadvantage. You'll need to be honest with yourself and take steps to compensate for this weakness. You'll need to make sure you have people around you who are good at numbers and who can help you overcome this challenge. I have met talented, visionary, creative entrepreneurs who have grown their companies into multi-million dollar enterprises but can't add two and two together. How do they do succeed? They almost always have a money person nearby -- an accountant, a CFO, a controller. They understand that to reach that level of success they'll need to invest in a person to watch the dollars and advise.

Related: Why Americans' Efforts to Save Still Don't Add Up (Infographic)

Being a successful business owner is about a lot of things. But when all is said and done, you're going to need to just do the math. If math isn't your thing, that's going to be a problem.

Gene Marks

Entrepreneur Leadership Network® VIP

President of The Marks Group

Gene Marks is a CPA and owner of The Marks Group PC, a ten-person technology and financial consulting firm located near Philadelphia founded in 1994.

Want to be an Entrepreneur Leadership Network contributor? Apply now to join.

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