Warm-up Work on your warm-up while I let people into our Zoom session 1. -9 - 7 = 2. 6 -(-5) = 3. -3 -(-2) = 4. 8 - 12 = 5. -3 - 8 = 6. -4 - (-5) - 6 = 7. If it is 5º outside and the temperature will drop 17º in the next six hours, how cold will it get? 8. Josie has $47 left on her checking account. If she writes a check for $55, what will Josie’s balance be? Multiplying and Dividing Integers 08/24/2020 - Monday Loading… Write in your INB Multiplying and Dividing Integers Multiply or divide the two numbers If the signs are the same, then the answer is POSITIVE Positive × positive = positive Example: 6 × 5 = 30 Negative × negative = positive Example: -6 × (-5) = 30 If the signs are different, then the answer is NEGATIVE Positive × negative = negative Example: 6 × (-5) = -30 Negative × positive = negative Example: -6 × 5 = -30 Here is another example how to remember: If good things happens to good people, it’s a good thing Positive × positive = positive If good things happens to bad people, it’s a bad thing Positive × negative = negative If bad things happens to bad people, it’s a good thing Negative × negative = positive Loading… Practice: In each column below determine four different expressions that could result in the given solution. -18 40 12 -28 1. -36÷2 2. 3. 4. 1. 2. 3. 4. 1. 2. 3. 4. 1. 2. 3. 4. 24 -20 7 -15 1. 2. 3. 4. 1. 2. 3. 4. 1. 2. 3. 4. 1. 2. 3. 4. Practice: One January day, the low temperature in Fargo, ND was - 8°. Over a period of six hours the temperature rose 4°. After six hours, what was the temperature? I KNOW: I NEED TO KNOW: PLAN AND WORK: SOLUTION: Warm-up with solutions 1. -9 - 7 = -16 2. 6 -(-5) = 11 3. -3 -(-2) = -1 4. 8 - 12 = -4 5. -3 - 8 = -11 6. -4 - (-5) - 6 = -5 7. If it is 5º outside and the temperature will drop 17º in the next six hours, how cold will it get? 5 - 17 = - 12 It will be -12º degrees. 8. Josie has $47 left on her checking account. If she writes a check for $55, what will Josie’s balance be? 47 - 55 = - 8 Josie will have a negative balance of $8.00. Practice with solutions In each column below determine four different expressions that could result in the given solution. These are just some of the examples. There is many more solutions. -18 40 12 -28 1. -36÷2 2. -6×3 3. 9×-2 4. -18×1 1. 5×8 2. 20×2 3. -4×-10 4. 80÷2 1. 2×6 2. -4×-3 3. 12×1 4. -24÷-2 1. 7×-4 2. -14×2 3. -28×1 4. -56÷2 24 -20 7 -15 1. -48÷-2 2. 12×2 3. -8×-3 4. 4×6 1. -10×2 2. 5×4 3. 20×-1 4. 100÷(-5) 1. -49÷-7 2. 7÷1 3. -21÷-3 4. 56÷8 1. -225÷15 2. -3×5 3. 1× -15 4. -45÷3