NS 3.3
Solve problems involving multiplication of multi-digit numbers by
two-digit numbers.
UNDERLYING SKILLS AND CONCEPTS:
multiply by 1-digit multipliers;
write money amounts in decimal
notation
Multiply Money Amounts
To solve a money problem where you are multiplying
a whole number times a money amount:
a
K
ey Ide
Step 1: Multiply the same way you would with whole numbers.
Step 2: Write the answer as dollars and cents.
E x am p l E
1
John bought 5 rolls of tape. Each roll costs $1.50.
How much did the tape cost all together? Find 5 $1.50.
S tep 2
Multiply the same
way as for whole
numbers.
2
$1. 50
5
St ep 3
Write the answer
as dollars and cents.
re g ro u p
$1.50
5
7 50
$ 1 .5 0
5
$ 7 .5 0
The rolls of tape cost $7.50 all together.
E x am p l E
2
Harold bought 9 pounds of apples. Apples are 95¢ a pound.
How much did Harold pay for the 9 pounds of apples? Find 9 $0.95.
St e p 1
Write the numbers
vertically.
S tep 2
Multiply the same
way as for whole
numbers.
8 4
$0. 95
9
$ 0 .9 5
9
8 55
St ep 3
Write the answer
as dollars and cents.
re g ro u p
$ 0 .9 5
9
$ 8 .5 5
Harold paid $8.55 for the apples.
page 148
Chapter 13 – Lesson 2
D – © CSL Associates, Inc. All rights reserved.
Step 1
Write the problem
vertically.
Name
P RAC T I C E
Find each product.
1.
$0.75
4
2.
$3.00
5.
$8.68
6
$7.42
3
3.
$22.26
6.
$52.08
D – © CSL Associates, Inc. All rights reserved.
$10.84
5
$12.38
7
4.
$86.66
7.
$54.20
$15.99
8
$25.25
9
$227.25
8.
$127.92
$136.89
2
$273.78
9. $1.75 2 $3.50
10. 9 $6.36 11. $5.98 4 $23.92
12. 8 $12.99 $103.92
13. $9.11 7 $63.77
14. $7.94 10 $79.40
15. $4.85 5 $24.25
16. $121.33 4 $485.32
17. $3.25 8 $26.00
18. $150.05 5 $750.25
19. $2.79 3 $8.37
20. $347.90 6 $2,087.40
21. 6 $0.89 $5.34
22. $3,295.50 7 $57.24
$23,068.50
Solve.
23. Skye buys 9 pounds of carrots at the market. The carrots cost
$1.29 a pound. How much do the carrots cost altogether?
$11.61
24. Pilar bought 3 movie tickets for $5.50 each.
How much did she pay for the movie tickets altogether?
$16.50
Math
Reasoning
Number Sense
MR 1.2
25. Mr. Tyler bought 38 packages of clay. Each package cost $6.95.
How much did the clay cost all together?
Explain each step of your solution strategy.
$264.10; Possible answer: Step 1: $6.95 695 cents
Step 2: 695 38 26410
Step 3: 26410 cents $264.10
Chapter 13 – Lesson 2
page 149
MCX94.HW.CL.G4.FM&Lesson.v211
8/2/04
19:16
Page 100
Name
…at home!
P RAC T I C E
Find each product.
$0.35
8
2.
$2.80
5.
$7.59
9
$68.31
$6.27
5
3.
$31.35
6.
$20.48
3
$4.70
11. $6.78 3 4.
$68.52
7.
$61.44
9. $2.35 2 $11.42
6
$12.87
8
$35.35
7
$247.45
8.
$102.96
$158.49
3
$475.47
10. 9 $7.32 $65.88
$20.34
12. 6 $15.83 $94.98
13. $8.91 7 $62.37
14. $6.95 10 $69.50
15. $5.45 5 $27.25
16. $134.95 4 $539.80
17. $2.75 8 $22.00
18. $160.04 5 $800.20
19. $4.89 4 $19.56
20. $285.70 6 $1,714.20
21. 7 $0.76 $5.32
22. $2,469.50 7 $17,286.50
Solve.
23. Neda buys 5 pounds of oranges at the market. The oranges cost
$1.29 a pound. How much do the oranges cost all together?
$6.45
24. Peter bought 4 movie tickets for $4.50 each.
How much did he pay for the movie tickets all together?
Math
Reasoning
$18.00
Number Sense
MR 1.2
25. Mr. Patton bought 27 packages of clay. Each package cost $6.95.
How much did the clay cost all together?
Explain each step of your solution strategy.
$187.65; Possible answer: Step 1: $6.95 695 cents
Step 2: 695 27 18765
Step 3: 18765 cents $187.65
page 100
Home Resource and Homework
Chapter 13 Lesson 2
D – © CSL Associates, Inc. All rights reserved.
1.
MCX94TEG4Ch01_32.v8.5.2 2/26/01 19:01 Page 275
Name
P RAC T I C E
Find each product.
1.
$0.75
4
2.
$3.00
5.
$8.68
6
$7.42
3
3.
$22.26
6.
$52.08
D – © CSL Associates, Inc. All rights reserved.
$10.84
5
$12.38
7
4.
$86.66
7.
$54.20
$15.99
8
$25.25
9
$227.25
8.
$127.92
$136.89
2
$273.78
9. $1.75 2 $3.50
10. 9 $6.36 11. $5.98 4 $23.92
12. 8 $12.99 $103.92
13. $9.11 7 $63.77
14. $7.94 10 $79.40
15. $4.85 5 $24.25
16. $121.33 4 $485.32
17. $3.25 8 $26.00
18. $150.05 5 $750.25
19. $2.79 3 $8.37
20. $347.90 6 $2,087.40
21. 6 $0.89 $5.34
22. $3,295.50 7 $57.24
$23,068.50
Solve.
23. Skye buys 9 pounds of carrots at the market. The carrots cost
$1.29 a pound. How much do the carrots cost altogether?
$11.61
24. Pilar bought 3 movie tickets for $5.50 each.
How much did she pay for the movie tickets altogether?
$16.50
Math
Reasoning
Number Sense
MR 1.2
25. Mr. Tyler bought 38 packages of clay. Each package cost $6.95.
How much did the clay cost all together?
Explain each step of your solution strategy.
$264.10; possible answer: Step 1: $6.95 695 cents
Step 2: 695 38 26410
Step 3: 26410 cents $264.10
Chapter 13 – Lesson 2
Student Book Page
page 149
Name
…at home!
P RAC T I C E
Find each product.
$0.35
8
2.
$2.80
5.
$7.59
9
$68.31
$6.27
5
3.
$31.35
6.
$20.48
3
$4.70
11. $6.78 3 4.
$68.52
7.
$61.44
9. $2.35 2 $11.42
6
$12.87
8
$35.35
7
$247.45
8.
$102.96
$158.49
3
$475.47
10. 9 $7.32 $65.88
$20.34
12. 6 $15.83 $94.98
13. $8.91 7 $62.37
14. $6.95 10 $69.50
15. $5.45 5 $27.25
16. $134.95 4 $539.80
17. $2.75 8 $22.00
18. $160.04 5 $800.20
19. $4.89 4 $19.56
20. $285.70 6 $1,714.20
21. 7 $0.76 $5.32
22. $2,469.50 7 $17,286.50
Solve.
23. Neda buys 5 pounds of oranges at the market. The oranges cost
$1.29 a pound. How much do the oranges cost all together?
$6.45
24. Peter bought 4 movie tickets for $4.50 each.
How much did he pay for the movie tickets all together?
Math
Reasoning
$18.00
Number Sense
MR 1.2
25. Mr. Patton bought 27 packages of clay. Each package cost $6.95.
How much did the clay cost all together?
Explain each step of your solution strategy.
$187.65; Possible answer: Step 1: $6.95 695 cents
Step 2: 695 27 18765
Step 3: 18765 cents $187.65
page 100
Home Resource and Homework
Chapter 13 Lesson 2
D – © CSL Associates, Inc. All rights reserved.
1.