7th Grade Math

Extra Practice EP15

Extra Practice

Multi-Part Lesson 5-3: Similarity and Proportional Reasoning

PART A PAGES 293–298

Find the value of x in each pair of similar figures.

1.

8 cm

"

$

#

% 5 cm

& '

) (

4 cm

x cm

2.

10 ft

*

+ ,

• . /

10 ft

15 ft 15 ft

x ft 12 ft

3.

2 in.

3 in.

; 8

:

x in.

4 in.

6

$ "

#

7 in.

x m

2.5 m

24.5 m

7 m

(^10)
/,
.
PARTS B C PAGES 299–303
For each pair of similar figures, find the perimeter of the second figure.

1. P = 15 mm P =? mm 2. P = 24 cm P =? cm

5 mm

15 mm

(^) 6 cm
4 cm

3. P = 42 in. P =? in. 4. P = 20 in. P =? in.

12 in. 8 in.

8 in.

5 in.

Multi-Part Lesson 6-1: Percents

PARTS A B PAGES 318–324

Find each number. Round to the nearest tenth if necessary.

1. 5% of 40 2. 10% of 120 3. 12% of 150 4. 12.5% of 40


2. 75% of 200 6. 13% of 25.3 7. 250% of 44 8. 0.5% of 13.7


3. 600% of 7 10. 1.5% of $25 11. 81% of 134 12. 43% of 110


4. 61% of 524 14. 100% of 3.5 15. 20% of 58.5 16. 45% of 125.5


5. 23% of 500 18. 80% of 8 19. 90% of 72 20. 32% of 54

EP2_EP36_ExtPract_M1_895130.indd EP15 1/6/10 11:46 AM