CHAPTER Ratios, Rates, and Proportional Reasoning

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Name: _____________________________________________________Date: ______________2.2 Warm UpThousands Hundreds Tens Ones Decimal Point Tenths Hundredths.1. Round to the nearest 10. Use the place value chart to help you.a) 18.5 ≈ b) 51.6 ≈2. Round to the nearest 100. Use the place value chart to help you.a) 489 ≈ b) 625 ≈3. Change dollars ($) to cents (¢). Example: $0.00839 = $0.00839 × 100= 0.839¢a) $0.00908 = $0.00908 × 100 b) $0.00504 = ×= ¢ =4. Write each fraction with a denominator of 1.a) ÷ 3b) ÷ ____18=3 1÷ 315=5 1÷ ____5. Write each fraction with a denominator of 100.a) ÷ 3$2.19=300 100÷ 3b)$4.20=400 10068 MHR ● Chapter 2: Ratios, Rates, and Proportional Reasoning
Name: _____________________________________________________Date: ______________2.2 Ratesrate• compares 2 quantities measured in different units• example: $1.69 per 100 g or $1.69/100 g of foodWorking Example 1: Determine Unit Ratesunit rate• a rate in which the second term is 1• example: 30 km/h means 30 km travelled in 1 hJesse and Brent send text messages to each other.Jesse can text 187 words in 5 min.Brent can text 444 words in 10 min.Estimate and calculate Jesse’s and Brent’s texting speeds.SolutionSpeed of texting =number of wordstimeEstimate:187 words is about 200 words.444 words is about 400 words.To estimate, round the numbers.Estimate SpeedCalculate SpeedJesse200 words= _______ words/min5 min187 words5 min187 5= 37.4 words/minBrent400 words= _______ words/min10 min444 words10 min444 10= words/minJesse can text words/min and Brent can text words/min.The estimates and answers are close to each other, so the answer is reasonable.Find the unit rates.a) Brandon runs 150 m in 25 s.b) Kira earns $88 for working 8 h.150 m25 s= m/s=150 ÷ 25$= $/hBrandon runsm/s.h2.2 Rates ● MHR 69
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Page 50: Working Example 2: Show You Know$3.

CHAPTER Ratios, Rates, and Proportional Reasoning

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