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Multiplying Integers -3(-4) = 12 3(-4) = -12 -3(4) = -12 3(4) = 12 When the first number is positive think of adding groups of the second number. 3(-4) = 3(4) = 0 + 4 + 4 + 4 ? 0 + (-4) + (-4) + (-4) ? 3(-4) = 0 + (-4) + (-4) + (-4) = ? When the first number is positive think of adding groups of the second number. 3(4) = 0 + 4 + 4 + 4 = ? 4(-2) = 4(2) = When the first number is positive think of adding groups of the second number. 0 + 2 + 2 + 2 + 2 ? 0 + (-2) + (-2) + (-2) + (-2) ? = = 2(-8) = 2(8) = When the first number is positive think of adding groups of the second number. 0 + 8 + 8 ? 0 + (-8) + (-8) ? = = *adding a positive A positive times a positive is: 20(5) = positive* ? Therefore: **adding a negative A positive times a negative is: 20(-5) = negative** ? When the first number is negative think of subtracting groups of the second number. -3(-5) = -3(5) = 0 − 5 − 5 − 5 ? 0 - (-5) - (-5) - (-5) ? -3(-5) = 0 - (-5) - (-5) - (-5) = ? When the first number is negative think of subtracting groups of the second number. -3(5) = 0 − 5 − 5 − 5 = ? -4(-7) = -4(7) = When the first number is negative think of subtracting groups of the second number. *Remember to use K.C.I. 0 − 7 − 7 − 7 - 7 ? 0 - (-7) - (-7) - (-7) - (-7) ? = = -2(-9) = -2(9) = When the first number is negative think of subtracting groups of the second number. *Remember to use K.C.I. 0 − 9 − 9 ? 0 - (-9) - (-9) ? = = *subtracting a positive A negative times a positive is: -3(15) = negative* ? Therefore: **subtracting a negative -3(-15) = A positive times a negative is: positive** ? -4(-5) = -4(5) = 4(-5) = 4(5) = 11(-4) = -3(7) = -9(3) = 6(-5) = -12(-3) = -7(-5) = 9(5) = 6(8) = -6(-7) = 6(-7) = -6(7) = 6(7) = |