advertisement

Lesson 9.2: Converting “Easy” Fractions to Decimals and Percents 2 5 1 2 1 4 3 25 Mental Math For each fraction, write the equivalent decimal and percent on your white board. 36 Example: You would write: ____ and ____ 100 87 100 19 100 3 10 1 2 7 20 Math Message Complete Problem 1 on Journal page 252. Using “Easy” Fractions • Remember that a percent literally means, “per” “cent”, or per one hundred. • It is easy to rename a fraction as a percent when the denominator is 100 because the fraction is per 100. For example, 87 has another name, 87%. 100 What are “easy” fractions? Any fraction, whose denominator is a factor of 100. 1 1 1 1 , , , 2 4 5 10 Using equivalent fractions to change “easy” fractions into percents. Ask yourself, what can I multiply the denominator by to equal 100. For example, 5 * ___ = 100 Then remember that whatever you do to denomi, you must do to nume. 2 5 * ____ * ____ Solve Problems 2-4 on page 252 with a partner. Solve problems on MJ page 253 alone. “Easy” Fractions MJ pages 342 and 343. Which are the “easy” fractions? How do you know? Let’s try a problem from tonight’s homework…