Student Edition - Mathematics in Context - Britannica

Answers to Check Your Work• Thinking of $47.00 as $50.00 $3.00:1 2 of $47.00 1 2of ($50.00 $3.00) 1 2of $50.00 1 2of $3.00 $25.00 $1.50 $23.50b. 1 1 4 $8.20 $10.25. Strategies will vary.• 1 2of $8.20 $4.10, so1 of $8.20 $2.05.4So 1 1 4 $8.20 $8.20 $2.05 $10.25.• Using a ratio table:Price $8.20 $4.10 $2.05 $10.25Weight (kg) 11 21 4 1 1 4SectionB5. Kenji might have thought:Discounts• 12.54 is more than 12 and 0.39 is more than 1 3. So theanswer will be more than 1 3 of 12, which is 4. Checking4.8096 is more than 4.• 12.54 is close to 12 and 0.39 is close to 0.5. So that wouldbe like taking 1 2 of 12, which is 6. Checking 4.8906 isreasonable.1. Discount 3 gives the best sale price. You may have used one ofthe following strategies:• Calculate and compare the discount prices.Discount 1: 10% of $5.98 is about $0.60. So 5% of $5.98 isabout $0.30.The sale price is $5.98 $0.30 $5.68.Discount 2: The discount is $0.50 off. So the sale price is$5.98 $0.50 $5.48.Discount 3: One-fifth of $5.98 is about $1.20. So the saleprice is $5.98 $1.20 $4.78.So Discount 3 gives the best sale price (largest discount).Answers to Check Your Work 41