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Percent Proportions and Percent Bars
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Percent Proportions and Percent Bars

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  • 1. Finding Percents of numbersUsing the Is over Of technique in conjunction with drawing percent bars
  • 2. What do you think is the answer??• Find 25% of 20• Let’s draw a picture. ? 25% 20 100%
  • 3. Can you solve this as a proportion?• Find 25% of 20• What would the proportion look like? x 25 ? 25% 20 100 X=5 20 100%
  • 4. We can do this Mathematically by using a special proportion...just find the following... The Percent – it is the easiest to find. Just look for the % sign! The “Of” number - it is always just behind the word of. The “Is” number - it may or may not be near the “is” word. If you find the other two then what is left is the “is”!
  • 5. Finding is, of or a Percent is % Use the proportion… of 100 Find the missing number by drawing a bar and using theproportion.a) 15% of 900 is what? x 15 ? 15% 900 100 x = 135 900 100
  • 6. Finding is, of or a Percent is % of 100Find the missing number by drawing a bar and using theproportion.b) What % of 84 is 63? 63 % 84 100 63 x% X = 75% 84 100
  • 7. Finding is, of or a Percent is % of 100 Find the missing number by drawing a bar and using the proportion.c) 35% of what # is 7? 7 35% 7 35 x 100 ? 100 X = 20
  • 8. Finding is, of or a Percent is % of 100Find the missing number by drawing a barand using the proportion.d) 2.5% of 120 is what? ? 2.5% x 2.5 120 100 x=3 120 100
  • 9. Finding is, of or a Percent is % of 100Find the missing number by drawing a barand using the proportion.60% of 600 is what number? x 60 600 100 x 60% x = 360 600 100
  • 10. Homework: P. 322 #2-26 evensYou MUST show the proportion and thework you do to get the answer.