# 200 Aufgaben aus der Trigonometrie mit Loesungen by Woerle K.

By Woerle K.

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Example text

For example, -2 v -5 v -3 v -1 = (-2 v -5) v (-3 v -1) = 10 v 3 = 30. Four negatives, an even number, make a positive. But put one more negative into the problem and you have -2 v -5 v -3 v -1 v -4 = (-2 v -5) v (-3 v -1) v -4 = 10 v 3 v -4= 30 v -4 = -120. With an odd number of negatives, your answer is negative. WORLDLY WISDOM A quick way to remember the rules for multiplying integers: multiply same signs, your answer is positive; multiply different signs, it’s negative. CHECK POINT Complete each multiplication problem.

Try to rearrange and you just can’t get a rectangle. 1 2 3 4 1 2 3 4 5 6 7 5 6 7 The number 7 is a prime number. With a composite number of blocks, you can always make at least two rectangles. 1 2 3 4 1 2 3 4 5 6 7 8 5 6 7 The number 8 is a composite number. 8 Chapter 4: Factors and Multiples 47 MATH TRAP Most people think 1 is a prime number. Most people are wrong. It’s understandable. The number 1 has no other factors, but it doesn’t quite fit the definition of prime. Its factors aren’t itself and 1.

Positive v Positive = Positive Positive v Negative = Negative v Positive = Negative Negative v Negative = Positive If you’re multiplying more than two numbers, you can save some time by counting the number of negative signs. If the number of negatives is even, the product will be positive. If the number of negatives is odd, the product will be negative. For example, -2 v -5 v -3 v -1 = (-2 v -5) v (-3 v -1) = 10 v 3 = 30. Four negatives, an even number, make a positive. But put one more negative into the problem and you have -2 v -5 v -3 v -1 v -4 = (-2 v -5) v (-3 v -1) v -4 = 10 v 3 v -4= 30 v -4 = -120.

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