The top U.S. elementary school in the 2016-2017 Math League was Medina Elementary School in Medina, Wash.

Those students definitely know their numbers. Well, here are some other number you should know.

A new study in Nature Communications reports that every 2.2 pounds of extra weight you carry reduces your life expectancy by two months.

For the 30 percent of U.S. adults who are obese (50 pounds overweight), the lost months can add up to eight years or more.

But, there's hope. The researchers also say losing 2.2 pounds adds two months to your life. And losing a pound a week can undo the 50-pounds-overweight life deficit in a year.

Get there by walking 10,000 steps daily and doing two to three 30-minute, strength-building sessions weekly.

Eat nine servings of veggies and fruit daily; and skip red and processed meats, refined grains and highly processed foods.

Get seven to eight hours of sleep nightly (sleep influences weight management).

Another boost: You can add a year to your life for each year you spend studying something after your last year of formal education (high school or college).