Lesson 4, unit4 - Percent



Gr. 8 MathUnit 4 – PercentStudent CopyLesson 48.N.3 – Solving Percent Problems (Part 2)Lesson Focus:To solve percent increase and decrease problems. Increase or Decrease ProblemsThere are 2 ways to solve increase/decrease problems:Method 1Step 1 – Find the amount of the increase/decrease by multiplying the ____________ by the ____________ ___________. Be sure to turn the percent into a ___________ before working with it! You do this by either dividing the percent by _______, or by moving the decimal ___ places to the _____ (to make the number ____________).Step 2 – ___________ the number calculated in step 1 to the original number if it is an increase problem.____________ the number calculated in step 1 from the original number if it is a decrease problem.Method 2Increase Problem ex. a 30% increaseSince it is increased by 30%, the original number is now _____% + _____% = _____% of the original amount. Be sure to turn the percent into a ___________ before working with it! Multiply the original number by _____% (____) to get your answer.Decrease Problem ex. a 30% decreaseSince it is decreased by 30%, the original number is now only _____% - _____% = _____% of the original amount.Be sure to turn the percent into a ____________ before working with it! Multiply the original number by ____% (_____) to get your answer.Ex. 1A length of 30 cm increased by 40%. What is the new length? Use each method to solve.Method 1:Method 2:Ex. 2A mass of 50 g decreased by 17%. What is the new mass? Use each method to solve.Method 1:Method 2:Ex. 3You start an exercise plan that promises that you will lose 5% of your body weight in the first month and 8% in the second. If you weigh 150 pounds now, how much will you weigh in 2 months? Is this the same thing as losing 13% over 2 months? Explain.AssignmentDo #10, 12, 13ab - 17 p. 253 ................
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