Do Now 2/16/12  Take out HW from last night. Text p. 238, #12-42 evens Text p. 238, #12-42 evens  Copy HW in your planner. Punchline worksheet #95 Punchline.

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Presentation transcript:

Do Now 2/16/12  Take out HW from last night. Text p. 238, #12-42 evens Text p. 238, #12-42 evens  Copy HW in your planner. Punchline worksheet #95 Punchline worksheet #95  In your journal, solve the following problems by estimating using fractions or decimals using 1% or 10%. Find 3% of 90. Find 3% of 90. Find 80% of 30. Find 80% of 30. You and three friends go out to dinner and when the bill comes the total is $65, not including the tip. If you want to leave a 20% tip, how much money should you leave for the waitress. You and three friends go out to dinner and when the bill comes the total is $65, not including the tip. If you want to leave a 20% tip, how much money should you leave for the waitress. 2.7 $

Homework Text p. 238, #12-42 evens  12) 31  14) 25  16) 8  18) 20  20) 6.4  22) 56  24) 48  26) 10  28) around $1.35  30) 30  32) 4  34) 115  36) 12  38) around $64.20  40) about 16 hits  42) a. about $10,000 b. about $850 b. about $850

Objective  SWBAT use proportions to solve percent problems

Percent- means ‘per one hundred’ or divided by 100. How many cents are there in a dollar?

“Percents and Proportions” You can represent “a is p percent of b” using the proportion You can represent “a is p percent of b” using the proportion In this equation, b is the whole number and a is the number that is compared to the base. will equal the percent.

Try It Out… What number is 15% of 88? Write a proportion where 15% is the percent and 88 is the base is 15% of 88 Percent proportion Substitute and then cross multiply

Try It Out… What number is 20% of 301? Write a proportion where 20% is the percent and 301 is the base is 20% of 301 Percent proportion Substitute and then cross multiply

Try It Out… What percent of 25 is 17? Write a proportion where 25 is the base and 17 is a part of the base. Percent proportion Substitute and then cross multiply 17 is 68% of 25

Try It Out… What percent of 136 is 51? Write a proportion where 136 is the base and 51 is a part of the base. Percent proportion Substitute and then cross multiply 51 is 37.5% of 136

Try It Out… Percent proportion Substitute and then cross multiply 20 is 12.5% of what number? Use an equation where 12.5% is the percent and 20 is a part of the base. 20 is 12.5% of 160

Try It Out… Percent proportion Substitute and then cross multiply 30 is 250% of what number? Use an equation where 250% is the percent and 30 is a part of the base. 30 is 250% of 12

Word Problem  A survey of people who suffered injuries at home found that 32% of all accidents involved falls. If 80 accidents involved falls, how many accidents were there? I’ve fallin’ and I can’t get up!! 80 is 32% of 250 Ms. Cleveland

Word Problem  Of the 325 teams in the NCAA Division 1 Women’s Basketball, 4% are in the Mid- American Conference (MAC). How many teams are in the MAC? 13 is 4% of 325

What Have We Learned… Types of Percent Problems (1) Find a percentWhat percent of 136 is 51? (2) Find a part of a baseWhat number is 15% of 88? (3) Find a base20 is 12.5% of what number?

Homework NJASK7 Prep Punchline worksheet #95 Punchline worksheet #95