MSM07G7_RESBK_Ch03_078-085.pe
12/29/05
9:00 PM
Page 82
Name
LESSON
Date
Class
Challenge
3-10 Weigh Out in Space
How much do you think you would weigh on Mars? You can
calculate anyone’s weight on any of the planets by multiplying his
or her weight times the planet’s gravitational pull. Use the table to
calculate what each animal listed below would weigh on different
planets. Write your answers in simplest form.
Gravitational Pull of the Planets
Planet
Mercury
Venus
Mars
Jupiter
19
50
9
10
19
50
2
Gravitational
Pull
Animal
1
2
Weight on Earth
Planet
Neptune
1.
Mouse
1
pound
16
2.
Cat
54 pounds
1
Mercury
Jupiter
3.
Dog
1
502 pounds
Saturn
Neptune
4.
5.
6.
Gorilla
Cow
Small parrot
200 pounds
1,000 pounds
7
pound
8
1
5
1
Weight on Other Planet
3
pounds
40
199
pounds
1
200
1
138 pounds
39
474
pounds
0
3
605 pounds
Uranus
160 pounds
Venus
900 pounds
Jupiter
2,500 pounds
7.
Macaw
32 pounds
Neptune
8.
Elephant
10,700 pounds
Uranus
82
4
5
76 pounds
Neptune
Copyright © by Holt, Rinehart and Winston.
All rights reserved.
19
20
Uranus Neptune
Mars
Mercury
1
Saturn
133
pounds
400
1
12
pounds
0
1
45 pounds
8,560 pounds
Holt Mathematics
2.3 CRB 4-up 103-127
12/29/05
9:02 PM
Page 122
Practice C
LESSON
3-10 Multiplying Fractions and Mixed Numbers
Practice B
LESSON
3-10 Multiplying Fractions and Mixed Numbers
Multiply. Write each answer in simplest form.
Multiply. Write each answer in simplest form.
1
1. 5 • 2
3
2. 9 • 4
1
22
3
64
5
9
• 4. 15 7
5
8. 15 • 6
1
57
1 3
10. 23 • 5
3 2
14. 34 • 5
3
15
3
3
2
2
17. 15 • 63
7
78
5
3
2
1 2
12. 48 • 9
17
1420
11
12
3 2 2
14. 35 • 9 • 3
2
1
15. 55 • 39
8
15
5
11
1
4
165
5
18. 25 • 46
2
103
Complete each multiplication sentence.
3
115
?
3
?
3
1 ?
3
17. 4 • 7 14
3
16. 5 • 1
2
0
5
3
2
19. Rolf spent 15 hours last week practicing his saxophone. If 1
of
0
the time was spent practicing warm-up routines, how much time
did he spend practicing warm-up routines?
2
5
4 ?
3
20. 5 • 4 5
2
2
20. A muffin recipe calls for 5 tablespoon of vanilla extract for
6 muffins. Arthur is making 18 muffins. How much vanilla extract
2 ?
5
18. 3 • 8 12
6
1
19. 3 • 8 4
41 hours
3 ?
3
21. 4 • 7 7
3
4
4
22. A hippopotamus lives about 27 times as long as a tiger.
1
A tiger lives an average of 16 years. How long does the
average hippopotamus live?
does he need?
1
1 T
5
417 years
4
23. A pie crust recipe calls for 5 teaspoon of baking powder.
Alice is making 13 pies. How much baking powder does
she need?
79
Copyright © by Holt, Rinehart and Winston.
All rights reserved.
Holt Mathematics
Reteach
LESSON
3-10 Multiplying Fractions and Mixed Numbers
To multiply fractions and mixed numbers:
Step 1: Write any mixed numbers as improper fractions.
Step 2: Multiply the numerators.
Step 3: Multiply the denominators.
Step 4: Write the answer in simplest form.
4 3
Multiply: 9 • 8
4 3
4•3
• 9 8
9•8
12
72
1
共
4
Multiply: 64 • 15
共
Divide numerator
and denominator
by 12, the GCF.
兲
兲
共 兲
2
105 teaspoons
80
Copyright © by Holt, Rinehart and Winston.
All rights reserved.
Holt Mathematics
Challenge
LESSON
3-10 Weigh Out in Space
How much do you think you would weigh on Mars? You can
calculate anyone’s weight on any of the planets by multiplying his
or her weight times the planet’s gravitational pull. Use the table to
calculate what each animal listed below would weigh on different
planets. Write your answers in simplest form.
Remember,
positive times
negative equals
negative.
Gravitational Pull of the Planets
1
4
25
9
64 • 15 4 • 5
Planet
Mercury
Venus
Mars
Jupiter
19
50
9
10
19
50
2
Gravitational
Pull
25 • (9)
4•5
1
2
Saturn
19
20
Uranus Neptune
4
5
1
5
1
225
20
1
6
Weight on Earth
Planet
1.
Animal
Mouse
1
pound
16
Neptune
2.
Cat
54 pounds
3.
Dog
502 pounds
4.
Gorilla
200 pounds
5.
Cow
1,000 pounds
6.
Small parrot
7
pound
8
7.
Macaw
32 pounds
Neptune
8.
Elephant
10,700 pounds
Uranus
1
114
Multiply. Write each answer in simplest form.
6
2
1
6•1
1. 6 • 9 9 9
3
4
90
2 7
5. 7 • 8
1
1
9. 2 • 44
3
1
2
兲
83
Mercury
Jupiter
3
1
Saturn
共 兲
Neptune
3
5
2
3
10. 3 • 14
1
28
1
2
11. 55 • 13
15
1
2
9
7. 1
• 3
0
5
14
4
3 5
1
2
5 2
8. 28 • 3
20
4•5
1
3
3 5
•
4. 1
• 22 1
• 0
0 2
10 • 2
20
4
30
5 3
6. 9 • 4
1
4
5
2. 5 • 7 5 • 7 35 7
1
10
10 • 9
3. 33 • 9 3 • 9 3 3
共
1
8
11. 38 • 45
2
2
13. 211 • 3
1
32
3 1
7
9. 1
• • 2 7 2
1
18
1
92
1 3
15. 86 • 7
1
12
16. 23 • 38
1
2
3
2
5
8. 1
• 5 12
10. 32 • 27
14
115
22
9
6. 11 • 27
7
45
7
45
5 2
12. 46 • 5
2
15
6
7
5. 1
• 5 18
2
7
7. 9 • 1
0
7
78
7
110
2 2
13. 25 • 3
1
2
5
3
9. 21 • 8
2 1
11. 35 • 2
2
15
冢 冣
3
8
• 4. 4
15
1
4
1
122
1
3. 7 • 5
3
34
7
6
6. 1
• 2 14
1
2
3
7. 12 • 7
1
2. 15 • 4
5
17
2
25
7
9
5. 1
• 9
4
3
7
1
1. 12 • 7
2
3. 6 • 5
16
共
1
1
12. 42 • 19
3
1
13. 24 • 13
2
兲
33
5
Mars
76 pounds
Uranus
160 pounds
Venus
900 pounds
Jupiter
2,500 pounds
Mercury
Neptune
Copyright © by Holt, Rinehart and Winston.
All rights reserved.
81
Copyright © by Holt, Rinehart and Winston.
All rights reserved.
Holt Mathematics
Copyright © by Holt, Rinehart and Winston.
All rights reserved.
122
1
82
Weight on Other Planet
3
pounds
40
199
pounds
1
200
1
138 pounds
39
474
pounds
0
3
605 pounds
133
pounds
400
1
120 pounds
1
45 pounds
8,560 pounds
Holt Mathematics
Holt Mathematics