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# December13, 2013

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### December13, 2013

1. 1. Make-Up Tests? K. Academy Topics Warm-Up: (0 Questions) Ratios/Rates/Unit Rates Measurement Ratios ..
2. 2. 1. Ratio Word Problems 2. Rate Problems .5 3. Rates & Proportional Relationships Topics are due by December 20 for online and Alt.Khan. **Waaaaay too many people have a grade of zero for their homework grade (Khan), which is 20% of your overall grade.
3. 3. The ratio 90 can be simplified by dividing: 3 90 = 30 3 1 Unit rate: 30 miles, 1 hour or 30 mi/(1)h
4. 4. 1. A 64 oz. Apple Juice costs \$1.35. Find the unit rate. Which unit, (oz. or \$) do we want to reduce to 1? 2. A 12 slice pizza costs \$9.00. Find the unit rate. 3. Which is the better buy: A 12 oz. bottle of juice for \$0.85, or an 8 oz. can of juice for \$0.50?
5. 5. Unit Conversions
6. 6. Ratios Involving Measurement 1. Express the ratio 6 feet to 15 inches as a fraction in simplest form. Six feet = 72 in. Simplify 72/15; the answer is 24/5 *Change the larger unit to the smaller one. 3 pints = 6cups. The ratio is now 6 cups to 2 cups. Simplify to: 3/1
7. 7. Proportions The shadow of a 4 ft. tall mailbox is 3 ft. long. If the shadow of a tree is 36 ft. long, how tall is the tree? height shadow 4 3 = height shadow = H 36 144 = 3H H = 48 You must be careful to place the same quantities in corresponding positions in the proportion The tree is 48 ft. tall 8
8. 8. Comparing Unit Rates