2. \( 78-35=78-35= \) 3. \( 125+64=125+64= \) 4. \( 200-89=200-89= \) 5. \( 567+198=567+198= \) 6. \( 430-275=430-275= \) 7. \( 950+105=950+105= \) 8. \( 600-327=600-327= \) 9. \( 1.240+3.560=1.240+3.560= \) 10. \( 4.000-1.875=4.000-1.875= \)
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The Deep Dive
Did you know that subtraction and addition are some of the most fundamental arithmetic operations? Their origins can be traced back to ancient civilizations, where counting objects was a common necessity. The Babylonians used a base-60 number system, which still influences how we measure time today! In a practical sense, mastering these basic operations can be a game changer, whether you're managing your finances, cooking up a storm in the kitchen, or just trying to solve everyday puzzles. Remember to double-check your calculations; a simple slip can lead to an entirely different conclusion. Always use estimation to keep your answers reasonable!
