Finding the Percent of a Number

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Presentation transcript:

Finding the Percent of a Number LESSON 7-7 Additional Examples Use a proportion to find 60% of 45. Let n represent the number you want to find. part whole n 45 60 100 = 100  n = 60  45 Write the cross products. 100n = 2,700 Multiply. n = 27 Divide each side by 100. 60% of 45 is 27.

Finding the Percent of a Number LESSON 7-7 Additional Examples Find 88% of 250. 88% = 0.88 Write 88% as a decimal. 0.88  250 = 220 Multiply. So, 88% of 250 is 220.

Finding the Percent of a Number LESSON 7-7 Additional Examples Use mental math to find 75% of 84. What you think 75% is equivalent to ;  84 = 63. 75% of 84 is 63. 3 4 Why it works 75% = 75 100 = Write 75% as a fraction in simplest form. 3 4  84 =  Multiply 84 by . Rewrite 84 as . 3 4 84 1 = Simplify. = 63 Divide. 252 4