Algebra I: 1001 Practice Problems For Dummies (+ Free Online Practice). Mary Jane Sterling

      403.

      404.

      405.

Dividing with Higher Power Divisors

      406–415 Divide each numerator by the denominator, using long division. Write any remainders as fractions.

      406.

      407.

      408.

409.

      410.

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      414.

      415.

Chapter 9

      Factoring Basics

      Factoring algebraic expressions is one of the most important techniques you’ll practice. Not much else can be done in terms of solving equations, graphing functions and conics, and working on applications if you can’t pull out a common factor and simplify an expression. Factoring changes an expression of two or more terms into one big product, which is really just one term. Having everything multiplied together allows for finding common factors in two or more expressions and reducing fractions. It also allows for the application of the multiplication property of zero. Factoring is crucial, essential, and basic to algebra.

The Problems You’ll Work On

      In this chapter, you work through factoring basics in the following ways:

       Determining what divides a number by using the rules of divisibility

       Creating prime factorizations of numbers

       Finding a numerical GCF (greatest common factor)

       Factoring out a GCF containing numbers and variables

       Reducing fractions with monomial divisors

       Reducing fractions with polynomial divisors

What to Watch Out For

      Here are a few things to keep in mind as you factor your way through this chapter:

       Making sure you apply divisibility rules correctly

       Writing a prime factorization with the correct exponents on the prime factors

       Checking that the terms remaining after dividing out a GCF don’t still have a common factor

       Reducing only factors, not terms

       Writing fractional answers with correct grouping symbols to distinguish remaining factors

Finding Divisors Using Rules of Divisibility

       416–421 Use divisibility rules for numbers 2 through 11 to determine values that evenly divide the given number.

      416. 88

      417. 1,010

      418. 3,492

      419. 4,257

      420. 1,940

      421. 3,003

Writing Prime Factorizations

      422–429 Write the prime factorization of each number.

      422. 28

      423. 45

      424. 150

      425. 108

      426. 512

427. 500

      428. 1,936

      429. 2,700

Factoring Out a GCF

      430–443 Factor each using the GCF.

      430.

      431.

      432.

      433.

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443.

Reducing Fractions with a Common GCF

      444–455 Reduce the fractions by dividing with the GCF of the numerator and denominator.

      444.