Multiplying Integers 11 4 Notes MULTIPLYING INTEGERS Same

Multiplying Integers

11. 4 Notes MULTIPLYING INTEGERS Same Signs = POSITIVE Opposite Signs = NEGATIVE + --+ - -+

I can… Multiply positive integers Ø Multiply negative and positive integers Ø Self Assessment 5 - I can do it without help & teach others. 4 - I can do this with no help, but I don’t know if I can explain it. 3 - I can do this with a little help. 2 - I can do this with a lot of help! 1 - I don’t have a clue.

Rules for Multiplying Integers �Make the vertical and horizontal lines of a tic-tac- toe game. It is as easy as playing tic-tac-toe!

Rules for Multiplying Integers �Place three positive signs going diagonal and negative signs in the rest of the remaining places. + --+ - -+

Rules for Multiplying Integers �Now you can start from any side and go any straight direction and you will see the correct integer rule for multiplication. + --+ - -+

Rules for Multiplying Integers �A positive times a negative equals a negative. � Left upper corner going right or down � Right lower corner going left or up. + --+ - -+ Different Signs = Negative

Rules for Multiplying Integers �A negative times a positive equals a negative. � Center row going left or right � Center column going up or down � Right upper corner or left lower corner going diagonally + --+ - -+ Different Signs = Negative

Rules for Multiplying Integers �A negative times a negative equals a positive. � Right upper corner going left or down � Left lower corner going right or up + --+ - -+ Same Signs = Positive

Rules for Multiplying Integers �A positive times a positive equals a positive. � Left upper corner and right lower corner going diagonally Even a knucklehead like me knows that! + --+ - -+ Same Signs = Positive

Your Turn… -7(-4) = = 28 + --+ - -+

Your Turn… + --+ - -+ 8(-6) = = -48

Your Turn… Evaluate the expression when m = 5 and n = -8 + --+ -mn = ? (-1)(5)(-8) = ? (-5)(-8) = ? = 40

Your Turn… Evaluate the expression when a = -4 and b = 3 + --+ - -+ 6 ab = ? (6)(-4)(3) = ? (-24)(3) = ? = -72

I can… Multiply positive integers Ø Multiply negative and positive integers Ø Self Assessment 5 - I can do it without help & teach others. 4 - I can do this with no help, but I don’t know if I can explain it. 3 - I can do this with a little help. 2 - I can do this with a lot of help! 1 - I don’t have a clue.

11. 4 Notes MULTIPLYING INTEGERS Same Signs = POSITIVE Opposite Signs = NEGATIVE + --+ - -+