c. \( 142+59= \) d. \( 139+26= \) e. \( 213+69= \)

Did you know that simple addition like this has been a fundamental building block of mathematics for centuries? Ancient civilizations, from the Egyptians with their hieroglyphs to the Sumerians using cuneiform, developed counting systems that laid the groundwork for modern arithmetic. So the next time you're adding numbers, remember you’re part of a historic lineage of number-crunchers! In real-world applications, addition isn't just for math class! Whether you're budgeting your money, cooking by adjusting ingredient amounts, or even tallying up scores in a game, these basic additions come in handy. For instance, adding up your expenses at the end of the month can help you plan your finances better!