If you can add two 3-digit numbers, then you can use the same method to add 4-digit numbers together. Just remember to add on the number that you have regrouped.

Activity: Adding 2-digit numbers Complete this interactive activity to learn more about adding numbers using column addition and then put your knowledge to the test with a quiz.

A zero-sum game is a situation in game theory where the only way to win is at someone else's expense. Here's how zero-sum and positive-sum games apply in finance.

Winning Mega Millions numbers and lottery results for $150 million drawing jackpot Tuesday, August 5, 2025. Any winners last night? What time is next drawing?

Want healthier kidneys? Try adding these superfoods to your plate.

Cell Energy and Cell Functions Cells manage a wide range of functions in their tiny package — growing, moving, housekeeping, and so on — and most of those functions require energy.

The Washington Mystics picked up another first-round pick before the trade deadline, putting themselves in position to dominate the 2026 WNBA Draft.

Miami Dolphins' signed former Pittsburgh Steelers' running back Aaron Shampklin and NFL Veteran Mike Boone on Monday after veteran back Alexander Mattison had season-ending neck surgery.

Improving the pitching staff has been a priority for the Chicago Cubs as the trade deadline approaches.

ED Miliband’s Net Zero policies will cost every household £389 a year by 2030, Tory analysis today reveals. The Labour government has pledged to totally decarbonise Britain’s energy grid ...