6:7-9 Estimating With Percents. Estimating cost You want a scarf that costs $14.99. The tax is 5%. Estimate the cost of the scarf with tax. 2 ways to.

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Presentation transcript:

6:7-9 Estimating With Percents

Estimating cost You want a scarf that costs $ The tax is 5%. Estimate the cost of the scarf with tax. 2 ways to solve First way is estimate the price and multiply by the tax. $14.99  $15  $15 x 5% (0.05) = $0.75 $15 + $0.75 = $15.75 A different way to think of this is the cost is 100% for the item + % tax $15 x 105% (cost of item plus tax) = $15.75 Way 2- use number sense 10% of $15 is $1.50, so 5% is $0.75.

Extra practice A bicycle costs $ and has 7% tax. What is the total cost? $150 x 107%  $ OR $150 x 7% = $10.50  $150 + $10.50 = $ A sweatshirt cost $17.99 and has 8% tax. What is the total cost? A pack pf pencils cost $1.99 and have a 10% tax. What is the total cost?

Estimating a tip Same principal. You have a bill of $ Estimate a 15% tip. $26.22  $26 $26 x 10% = $2.60 $26 x 5% = $1.30 $ $1.30 = $3.90 Or $26 x 15% = $3.90

Try these Estimate a 15% tip on $76.02 Estimate a 15% tip on $489.03

Estimating a sale price A pair of boots costs $ The store is having a 30% sale. Estimate the sale price. $58.97  $60. If it is 30% off, that means the sale price is 70% (100%-30%). 70% x $60 = $42. Way 2 $60 x 30% = $18 $60 - $18 = $42

Try these Estimate the sale price of a baseball glove that’s originally $40.19 but is 40% off. $40.19  $40 $40 x 60% = $24 Estimate the sale price of a necklace that costs $42 originally and is 40% off. Estimate the sale price of a ball that originally cost $5.99 but is 30% off.

homework P #7-20 all Chapter review p #1-33 all due in 2 school days