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Integers Addition and Subtraction Rules, Examples, and Practice

Learn the rules for adding and subtracting integers with examples and practice problems. Understand how to determine the sign and process to use, and keep the sign of the largest number. Practice evaluating expressions with positive and negative integers.

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Integers Addition and Subtraction Rules, Examples, and Practice

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  1. Objective Add and subtract integers

  2. Rules for adding integers • Same Sign 2. Different Signs Add numbers Subtract numbers Keep sign Keep sign of largest number

  3. Rules for subtracting integers First change to addition then follow addition rules

  4. Evaluate the expression -6 + (-3) Write the problem -6 + (-3) Draw arrows to signs & determine process to use same Same sign add the absolute value of number 6 + 3 -9 9 Keep the sign

  5. Evaluate the expression 8 + (-7) Write the problem 8 + (-7) Draw arrows to signs & determine process to use Different Opposite sign subtract the absolute value of number 8 - 7 1 Keep the sign of the largest number

  6. Evaluate the expression -5 + 4 Write the problem -5 + 4 Draw arrows to signs & determine process to use different Different signs subtract the absolute value of number 5 - 4 -1 1 Keep the sign of largest number

  7. Evaluate the expression 2 - 15 Write the problem 2 - 15 Separate number and sign then insert a “+” 2 -15 + Draw arrows to signs to show what to do opposite 15 - 2 Subtract -13 13 Keep sign of largest number

  8. Evaluate the expression 12 - (-6) Write the problem 12 - (-6) Combine the 2 negatives to make positive 12 + 6 Draw arrows to signs to show what to do same 12 + 6 Same signs add 18 Keep sign

  9. Evaluate the expression g - h if g = -2 and h = -7 Write the problem g - h Replace g with -2 and h with -7 -2 - (-7) -2 + 7 Combine the two negatives to make a positive different Draw arrows to signs to show what to do

  10. Evaluate the expression g - h if g = -2 and h = -7 -2 + 7 Different signs subtract different 7 - 2 Keep sign of largest number +5 5

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