1. Review Three ways to write ratios. All ratios must be what?
Are they equivalent?
2/3 and 4/6
150miles / 5hours. Find unit rate
5cm = ?cm
1min 1hr

2. 5.7 Solving/Writing Proportions

3. Information Proportion: 2 ratios are equal. Ex: 2/3 = 4/6
Cross product: 2 ratios, multiply num. by den. of 2nd ratio.

4. Are they proportions?
9 , 6
10, 20
2 , 5
20 , 50
4 , 8
10 , 20
5 , 10
4 6

5. Are they proportions? - St
5 , 10
8 , 16
9 , 3
32 , 8
10 , 2
25 5
8 , 4
9 6

6. Proportions with Equivalent Ratios
2 = x
12 = x

7. Proportions with equivalent Ratio - St
x = 20
x = 6
5 = x
6 18
x = 2
12 6

8. Solve using cross product
11 = 3 t
30 = 15
48 x + 9

9. Solve using cross product-st.
12 = 4
x 3
15 = 51
5 x + 11
16 = 10 p
8 = 20
2 t

10. review

11. Write/Solve Proportions
Hair grows about 0.7cm. in 2 weeks. How long does hair take to grow in 14cm.?

12. Writing/Solving Proportions
A roll of paper towels cost $ How many rolls can you buy for $9.50.

13. Writing/Solving Proportions-St
Carl works 8hrs and earns $52. How many hours would he have to work to earn $130?

14. Write/Solve Proportion-st
Store sells a drink in two sizes. 10 ounces for $2.25 and 35 ounces for $7. Are they equivalent?

15. Wrap-up
Questions/Comments
I.C.: workbook pg. 69 (GRADED TOMORROW)