Get out your notebook and do the focus Add 4, , Subtract 369, ,078 Basic Math and Pre-Algebra for Dummies by Mark Zegarelli

HISTORY OF NUMBERS: Infinity (∞) is the idea of “foreverness”. It means numbers never end because you can always add one to any number you name. So, you can not really add one to infinity, because infinity is not a number. BUT if you could, ∞ + 1 = ∞ Basic Math and Pre-Algebra for Dummies by Mark Zegarelli

Quick History of numbers: Hunter-gatherer societies lumped things into “a lot” or “a little”. When farming developed and trade began, people used stones, clay tokens, or other objects to keep count of animals, grain, oil, and the like. They traded one-to- one. Eventually, they started drawing pictures instead of using stones. These drawings developed into tally marks and became more complex over time. In and attempt to keep track of things, early humans invented numbers. Basic Math and Pre-Algebra for Dummies by Mark Zegarelli

Over time, the Babylonians, Egyptians, Greeks, Romans, Mayans, Arabs, and Chinese, just to name a few, developed their own systems of writing numbers. You have seen Roman numerals. Our system, Hindu- Arabic numbers, is based on the early Arabic numbers or the decimal system. As we work through formulas and sets of numbers this year, we’ll talk about who developed them. Basic Math and Pre-Algebra for Dummies by Mark Zegarelli

FOLDABLE: We are going to make this foldable in your notebook so that it does not get lost. Fold a clean sheet (front and back). Cut flap into three sections. Basic Math and Pre-Algebra for Dummies by Mark Zegarelli Adding Integers Same Signs Adding Integers Different Signs Subtracting Integers

ADDING INTEGERS-make foldable If the signs are the SAME: Find the sum (add) Use the same sign as the integers. If the signs are the different: Find the difference (subtract) Use the sign of the integer with the larger value. Basic Math and Pre-Algebra for Dummies by Mark Zegarelli

HOMEWORK: WORKSHEET: multiplying and dividing integers Help can be found in previous ppt. Basic Math and Pre-Algebra for Dummies by Mark Zegarelli