Add and subtract integers

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Presentation transcript:

Add and subtract integers Objective Add and subtract integers

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

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

Same sign add the absolute value of number 6 + 3 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

Opposite sign subtract the absolute value of number 8 - 7 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

Different signs subtract the absolute value of number 5 - 4 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

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

12 - (-6) 12 + 6 12 + 6 18 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

Replace g with -2 and h with -7 -2 - (-7) 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

Different signs subtract 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