Copyright©amberpasillas2010. For Learning to Happen! Take out a piece of paper. Take out something to write with. Try all of the examples. Ignore all.

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Presentation transcript:

copyright©amberpasillas2010

For Learning to Happen! Take out a piece of paper. Take out something to write with. Try all of the examples. Ignore all other distractions. Watch the 1 st slide then I will have you try a few examples.

copyright©amberpasillas = = = = -1 Odd # of Negatives = Negative Even # of Negatives = Positive = +1

copyright©amberpasillas2010 1) 0.16 x ) 70 x ) x Try these on your paper!

copyright©amberpasillas2010 Multiply (-3) (-0.14) 2 Step 1: Write the problem vertically 0.14 x 3 Step 2: Ignore the decimal points and multiply Step 3: Determine where the decimal point goes in the product –. – = + Step 4: Determine the sign of your answer using your integer rules. The answer is POSITIVE

copyright©amberpasillas2010 Multiply (-0.4) (0.6) x 0.6 The decimal moves two places to the left 20 – Signs are the same Signs are different POSITIVE NEGATIVE

copyright©amberpasillas2010 Multiply (0.8) (-0.9) x 0.9 The decimal moves two places to the left 70 – Signs are the same Signs are different POSITIVE NEGATIVE

copyright©amberpasillas2010 HOW MANY DECIMAL PLACES? 1 decimal place 3.0 2) (-0.40)(-2.0) 0.40  2.0 1) -3.0(0.20)  decimal places = 3 decimal places 2 decimal place 1 decimal places = 3 decimal places

copyright©amberpasillas ) (-0.40)(-2.0) 0.40  2.0 1) -3.0(0.20)  WHAT IS THE SIGN OF YOUR ANSWER? NEGATIVE POSITIVE

copyright©amberpasillas2010 Find the product. (-2.8)(-3) -2.8  POSITIVE

copyright©amberpasillas2010 Divide 0.27  Step 2: Move the decimal point in the dividend straight up into the quotient Step 3: Divide as usual. Step 1: Write the problem in the long division format. Ignore the negatives. TRICK: Dead Monkeys Smell Bad ! = Step 4: Determine the sign.

copyright©amberpasillas2010 Divide  Step 2: Move the decimal point in the dividend straight up into the quotient Step 3: Divide as usual. Step 1: Write the problem in the long division format. Ignore the negatives. TRICK: Dead Monkeys Smell Bad ! = Step 4: Determine the sign.

copyright©amberpasillas2010

Multiply Negative Decimals Multiply (-0.3) (0.9) x 0.9 The decimal moves two places to the left. 20 – #10 Signs are the same Signs are different POSITIVE NEGATIVE

copyright©amberpasillas2010 Divide Negative Decimals Divide (- 0.75)  (0.15) #11 +  + = + –  – = + +  – = – –  + = – Signs are the same Signs are different POSITIVE NEGATIVE = – 5

copyright©amberpasillas2010 Extras

copyright©amberpasillas NegativePositive 0.5 > -2 < 1.5 # < Less than > Greater than

copyright©amberpasillas  + = + –  – = + +  – = – –  + = – Signs are the same Signs are different POSITIVE NEGATIVE

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