NS 3.3*1%7
Solve problems
involving multiplication of multi-digit numbers by
&&66
)OXHQWO\PXOWLSO\PXOWLGLJLWZKROHQXPEHUVXVLQJWKHVWDQGDUG
DOJRULWKP two-digit numbers.
UNDERLYING SKILLS AND CONCEPTS:
multiplication basic facts;
place value
More 2-Digit Multiplication
You use basic facts and place value when you
multiply by two-digit multipliers.
a
K
ey Ide
E x am p l E
Find
1
704
! 38
Step 1
Step 2
704
! 38
5632
E x am p l E
Find
704
! 38
5632
21120
2 6,7 5 2
2
2,586
! 42
Step 1
Step 2
Multiply
2,586 by 2.
Multiply 2,586 by 40 and
add the partial products.
2,5 8 6
! 42
5172
page 92
2,5 8 6
! 42
5172
103440
1 0 8,6 1 2
Chapter 8 – Lesson 4
D – © CSL Associates, Inc. All rights reserved.
Multiply 704 by 8. Multiply 704 by 30 and
add the partial products.
Name
P RAC T I C E
Multiply.
1.
403
27
2.
10,881
5.
567
96
6.
7,206
34
10.
6,047
57
344,679
8,536
65
14.
554,840
D – © CSL Associates, Inc. All rights reserved.
743
59
6,027
84
506,268
708
36
4.
25,488
7.
43,837
245,004
13.
3.
25,410
54,432
9.
605
42
535
84
46,828
8.
44,940
11.
5,004
68
6,248
56
349,888
647
43
27,821
12.
340,272
15.
509
92
2,059
23
47,357
16.
5,921
47
278,287
Solve each problem.
17. Kristin is 12 years old today. How
many days old is she? Assume
there are 365 days in a year.
4,380 days
18. Larry’s puppy is 22 weeks old
today. How many hours old is the
puppy? HINT: First find how many
days old the puppy is.
3,696 hours
Math
Reasoning
More 2-Digit Multiplication
MR 2.3
19. When you multiply a three-digit number by a two-digit number, what is the
greatest number of digits you can have in your product?
5
Chapter 8 – Lesson 4
page 93
MCX94.HW.CL.G4.FM&Lesson.v211
8/2/04
19:16
Page 64
Name
…at home!
P RAC T I C E
Multiply.
205
15
2.
3,075
5.
348
92
6.
627
54
6,603
43
10.
5,049
78
393,822
9,546
87
14.
830,502
6,096
85
518,160
805
37
4.
29,785
7.
33,858
283,929
13.
3.
28,899
32,016
9.
507
57
576
64
5,317
8.
36,864
11.
6,073
78
7,249
57
413,193
732
34
24,888
12.
473,694
15.
409
13
2,032
23
46,736
16.
5,219
49
255,731
Solve each problem.
17. Elsa is 13 years old today. How
many days old is she? Assume
there are 365 days in a year.
18. Larry’s baby brother is 28 weeks
old today. How many hours old is
his brother?
4,745 days
Math
Reasoning
4,704 hours
More 2-Digit Multiplication
MR 2.3
19. When you multiply a four-digit number by a two-digit number, what is the
greatest number of digits you can have in your product?
6
page 64
Home Resource and Homework
Chapter 8 Lesson 4
D – © CSL Associates, Inc. All rights reserved.
1.
MCX94TEG4Ch01_32.v8.5.2 2/26/01 19:00 Page 173
Name
P RAC T I C E
Multiply.
1.
403
27
2.
10,881
5.
567
96
6.
7,206
34
10.
6,047
57
344,679
8,536
65
14.
554,840
D – © CSL Associates, Inc. All rights reserved.
743
59
6,027
84
506,268
708
36
4.
25,488
7.
43,837
245,004
13.
3.
25,410
54,432
9.
605
42
535
84
46,828
8.
44,940
11.
5,004
68
6,248
56
349,888
647
43
27,821
12.
340,272
15.
509
92
2,059
23
47,357
16.
5,921
47
278,287
Solve each problem.
17. Kristin is 12 years old today. How
many days old is she? Assume
there are 365 days in a year.
4,380 days
18. Larry’s puppy is 22 weeks old
today. How many hours old is the
puppy? HINT: First find how many
days old the puppy is.
3,696 hours
Math
Reasoning
More 2-Digit Multiplication
MR 2.3
19. When you multiply a three-digit number by a two-digit number, what is the
greatest number of digits you can have in your product?
5
Chapter 8 – Lesson 4
Student Book Page
page 93
Name
…at home!
P RAC T I C E
Multiply.
205
15
2.
3,075
5.
348
92
6.
627
54
6,603
43
10.
5,049
78
393,822
9,546
87
14.
830,502
6,096
85
518,160
805
37
4.
29,785
7.
33,858
283,929
13.
3.
28,899
32,016
9.
507
57
576
64
5,317
8.
36,864
11.
6,073
78
7,249
57
413,193
732
34
24,888
12.
473,694
15.
409
13
2,032
23
46,736
16.
5,219
49
255,731
Solve each problem.
17. Elsa is 13 years old today. How
many days old is she? Assume
there are 365 days in a year.
18. Larry’s baby brother is 28 weeks
old today. How many hours old is
his brother?
4,745 days
Math
Reasoning
4,704 hours
More 2-Digit Multiplication
MR 2.3
19. When you multiply a four-digit number by a two-digit number, what is the
greatest number of digits you can have in your product?
6
page 64
Home Resource and Homework
Chapter 8 Lesson 4
D – © CSL Associates, Inc. All rights reserved.
1.