By Carolyn Wheater

*Idiot's courses: simple math and Pre-Algebra* is helping readers wake up to hurry and relearn the first strategies of arithmetic, geometry, and pre-algebra. content material comprises simple math operations (addition, subtraction, multiplication, division); be aware difficulties; components and multiples; fractions, decimals, and percents; weights and measures; graphs; facts and likelihood; and algebra and geometry fundamentals. a convention difficulties part can be integrated to aid strengthen the maths ideas. This publication is perfect for an individual desiring a refresher so as to cross front checks, corresponding to the GED®, ASVAB, and Praxis®.

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**Extra resources for Idiot's Guides: Basic Math and Pre-Algebra**

**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.