Finding the Percent of Increase or Decrease 4 - （发现的百分比增加或减少4 -）.pdf

Finding the Percent of Increase or Decrease Objectives: • To find the “percent of increase or decrease” using the percent box Outcomes: • To complete the “Percent (rate) of Increase or Decrease” worksheet with at least a 90% score Warm-Up: The percent box is an excellent tool for the visual learner. It is easy to remember and easy to use, making these more difficult percent problems much less complicated. The student does not need to do percent or fraction conversions when using the box. The main box is divided into four squares. The upper left square is marked “is/part”. The lower left square is marked “of/whole”. The upper right square is marked “percent”, and finally the bottom right square is always filled in with “100”. After placing the numbers in the appropriate squares, cross-multiply the numbers in the two filled-in squares that are diagonal from each other. Divide the answer by the leftover number. Is/Part % Of/Whole 100 New Instruction: The boxes are color coordinated for easy placement of numbers. FINDING THE PERCENT OF INCREASE OR DECREASE ORIGINAL AMOUNT $24.00 FINAL AMOUNT $30.00 FIND THE PERCENT (RATE) OF INCREASE. AMOUNT OF % INCREASE / $6.00 ? PERCENT OF (find the difference INCREASE between the original and final amounts) WHOLE / $24.00 100 ALWAYS 100 ORIGINAL 1. Subtract original amount from final amount. $30.00 - $24.00 = $6.00 (amount of increase) 2. Cross-multiply numbers in two filled-in boxes. $6.00 X 100 = 600 3. Divide result by the extra number. 600 ÷$24.00 = 25%