We can add, subtract, multiply and divide integers. We will start with Adding Integers.
ADDING INTEGERS To add integers you must first check the signs of the numbers you are adding together. The RULES are: SAME SIGN ADD AND KEEP If the signs are the same, add the absolute value of the integers and Example: 3 + 7 = 10 -5 + -9 = -14 DIFFERENT SIGNS SUBTRACT AND ASK If the signs are different, subtract the absolute value of the smaller integer from the absolute value of the larger integer and ask what do I have more of – positive or negative? Keep that sign. _______________________________________________________________________________________ Let's Add some Integers! 8 + 2 = ? Check signs – they are both positive. Add & Keep (Add 8 and 2 to get 10. Keep the positive sign.) 8 + 2 = 10 __________________________________________________________________________________ 14 + (–5) = ? Check signs – they are different. Subtract & Ask (Subtract the smaller absolute value from the larger so subtract 5 from 14. Ask - What do I have more of? Negative or Positive? Positive) KEEP THAT SIGN 14 + (–5) = 9 __________________________________________________________________________________ –9 + 3 = ? Check signs – they are different. Subtract & Ask (Subtract the smaller absolute value from the larger so subtract 3 from 9 = 6. Ask - What do I have more of? Negative or Positive? Negative) KEEP THAT SIGN –9 + 3 = –6 |
Adding Same Sign Numbers
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