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25.1 and 25.2 Percents, Decimals and Fractions p. 556 and 558

25.1 and 25.2 Percents, Decimals and Fractions p. 556 and 558. Glossary. Introduction : Quick Review Objective : 1. To write ratios as percents and express parts of a whole area as percents 2. Learn how to estimate and find a percent of a number

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25.1 and 25.2 Percents, Decimals and Fractions p. 556 and 558

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  1. 25.1 and 25.2Percents, Decimals and Fractionsp. 556 and 558 Glossary • Introduction: • Quick Review • Objective: 1. To write ratios as percents and express parts of a whole area as percents 2. Learn how to estimate and find a percent of a number • Remember: when multiplying decimals numbers, move the decimal to the RIGHT for each power of 10(i.e. 100 - two powers of ten, move the decimal over TWO to the right:.2 = .20 = 20%) Glossary

  2. Fraction to Percent: divide, move decimal to the right two spots (i.e. 1/5 = .20 = 20%) • Decimal to Percent: multiply by 100, move decimal to the right two spots (i.e. .20 = 20%) • Percent to Fraction: write as a fraction over 100 - simplify (i.e. 20% = 20/100 = 1/5) • Percent to Decimal: divide by 100, move decimal to the left two spots (i.e. 20% = .20) • Fraction to Percent: divide, move decimal to the right two spots (i.e. 1/5 = .20 = 20%) • Decimal to Percent: multiply by 100, move decimal to the right two spots (i.e. .20 = 20%) • Percent to Fraction: write as a fraction over 100 - simplify (i.e. 20% = 20/100 = 1/5) • Percent to Decimal: divide by 100, move decimal to the left two spots (i.e. 20% = .20) • Fraction to Percent: divide, move decimal to the right two spots (i.e. 1/5 = .20 = 20%) • Decimal to Percent: multiply by 100, move decimal to the right two spots (i.e. .20 = 20%) • Percent to Fraction: write as a fraction over 100 - simplify (i.e. 20% = 20/100 = 1/5) • Percent to Decimal: divide by 100, move decimal to the left two spots (i.e. 20% = .20)

  3. 25.3Estimate and Find Percent of a Numberp. 562 Glossary • Introduction: • Quick Review • Objective: Learn how to estimate and find a percent of a number

  4. Guided Instruction: • Example 1: Finding the percent of a number • 60% of 25 • Josh played in ____ games.

  5. Tip: _____ Tip: _____ Tip: _____ 15% of _____ Our Work (write 15% as a fraction or a decimal and multiply it with the total: 15/100 x $___ OR .15 x $____): 15% of _____ Our Work (write 15% as a fraction or a decimal and multiply it with the total: 15/100 x $___ OR .15 x $____): 15% of _____ Our Work (write 15% as a fraction or a decimal and multiply it with the total: 15/100 x $___ OR .15 x $____):

  6. 25.4Discount and Sales Taxp. 568 • Introduction: • Quick Review • Objective: to learn how to solve problems involving discounts and sales tax • Vocab: • discount= amount subtracted from the regular price • SALE PRICE = regular price - discount! • sales tax= percent of the cost of an item Glossary

  7. Guided Instruction: • Example 1: Discount - Volleyball set, $32 (25% off) • 32 x .25 = _________ • SALE PRICE = regular price - discount • Discount = _________ and Sale Price = __________ • Example 3: Sales Tax - Table tennis, $119(5% sales tax) • 119 x .05 = ___________ • She paid ___________ in sales tax.

  8. 25.6Simple Interestp. 538 Glossary • Introduction: • Quick Review • Objective: Learn how to find simple interest • Vocab: • principal= original amount put into a bank account • simple interest=fixed percent of the principal paid yearly (formula: I = prt ... I = interest, p = principal, r = interest rate per year, t = time in years)

  9. Guided Instruction: • Example 1: Finding the simple interest ($500, 6%, 2 years) • I = prt • Katrina will earn ________ in interest.

  10. RECAP: Match the vocab word with its definition • I = interest, p = principal, r = interest rate per year, t = time in years • amount subtracted from the regular price • original amount put into a bank account • percent of the cost of an item • regular price - discount • fixed percent of the principal paid yearly • principal • discount • SALE PRICE • sales tax • simple interest • rate • I = prt

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