Multi-Part Lesson
Name
PART
A
B
12-2
C
D
E
F
Add Another Way
First use this page as a workmat. Then show
two-digit numbers using
and . Write
how many tens and ones.C08-040A-112052
How
many in all?
C08-040A-112052
+
Copyright © Macmillan/McGraw-Hill, a division of The McGraw-Hill Companies, Inc.
tens
ones
tens +
+
Chapter 12 • Lesson 2C
ones =
=
five hundred thirty-one
531
Show the numbers by drawing
and .
Write how many tens and ones. C08-040A-112052
Write
how many in all.
C08-040A-112052
1. 43 + 22
2. 41 + 33
tens
ones
tens +
tens
ones
+
ones
tens +
=
+
ones
=
C12-051A-112052
C12-050A-112052
3. 14 + 52
tens
4. 45 + 34
tens
ones
+
ones
=
tens +
+
ones
=
C12-053A-112052
C12-052A-112052
532 five hundred thirty-two
Chapter 12 • Lesson 2C
Copyright © Macmillan/McGraw-Hill, a division of The McGraw-Hill Companies, Inc.
tens +
ones
Multi-Part Lesson
Name
PART
A
B
12-2
C
D
E
F
Add Another Way
Get Ready
Robin and Tony added 36 + 25. They got the
same answer, but they did the problem in
different ways.
Main Idea
I will break apart
numbers to add.
Robin’s Way:
36 + 25
30 +
6
+ 20 +
30 + 20 = 50
6 + 5 = 11
50 + 11 = 61
Tony’s Way:
36 + 25
5
4
+ 21
36 + 4 + 21
40
+ 21 = 61
Copyright © Macmillan/McGraw-Hill, a division of The McGraw-Hill Companies, Inc.
Check
Use
and . Break apart the numbers.
Write C08-040A-112052
how
many in all.
C08-040A-112052
1.
42 + 23
2. 56 + 12
+
3.
+
=
+
=
+
=
+
=
+
=
How does it help to break a number
apart before adding?
Chapter 12 • Lesson 2D
five hundred thirty-three
533
Practice
Use
and . Break apart the numbers.
Write C08-040A-112052
how
many in all.
C08-040A-112052
4.
36 + 13
5.
75 + 21
6.
534
=
+
=
+
=
+
=
+
=
+
=
7.
37 + 23
41 + 35
+
=
+
=
+
=
+
=
+
=
+
=
82 + 17
+
=
+
=
+
=
five hundred thirty-four
Copyright © Macmillan/McGraw-Hill, a division of The McGraw-Hill Companies, Inc.
8.
+
Name
Use
and . Break apart the numbers.
Write C08-040A-112052
how
many in all.
C08-040A-112052
9. 44 + 27
10. 37 + 36
6 + 21
Copyright © Macmillan/McGraw-Hill, a division of The McGraw-Hill Companies, Inc.
44 +
6
+
21
+
+
50 + 21 = 71
+
=
+
11. 19 + 14
12. 61 + 39
+
+
+
+
+
+
+
=
+
=
13. 46 + 46
14. 74 + 16
+
+
+
+
+
+
+
=
+
=
Chapter 12 • Lesson 2D
five hundred thirty-five
535
Solve. Use
and to help.
15. Dario had
34
crayons. Allison had
C08-040A-112052
C08-040A-112052
27 crayons. How many crayons
did they have in all?
crayons
16. There were 19 people in line for a ride.
22 more people got in line. How many
people are in line now?
?
19
people
22
seashells
18.
536
How do you count
on when adding two numbers?
five hundred thirty-six
Math at Home Activity: Show your child the number 32. Have him
or her draw cubes to show the number in a tens and ones chart. Have
your child add the number 24 to the original number.
Copyright © Macmillan/McGraw-Hill, a division of The McGraw-Hill Companies, Inc.
17. Dave found 44 seashells. Chris
found the C12-080A-112052-V
same number of seashells.
How many seashells did they find?
Multi-Part Lesson
Name
PART
A
B
13-2
C
D
E
Another Way to Subtract
Get Ready
If you take apart a number to make a 10
it is easier to subtract.
Main Idea
I will take apart
numbers to subtract.
Copyright © Macmillan/McGraw-Hill, a division of The McGraw-Hill Companies, Inc.
Check
Use
Subtract.
and
1. 38 - 27
C13-009A-112051.ai
C13-009A-112051.ai
38 -
2. 64 - 23
64 -
=
-
3.
. Take apart the number.
=
=
-
=
Why does it help to break a number
apart before subtracting?
Chapter 13 • Lesson 2C
five hundred seventy-one
571
Practice
Use
Subtract.
4. 36 - 14
and
36 -
=
. Take apart the number.
C13-009A-112051.ai
C13-009A-112051.ai
-
75 =
6. 45 - 24
45 -
-
75 =
8. 26 - 15
=
=
-
=
9. 98 - 27
=
=
-
=
10. 28 - 16
28 -
=
-
572
five hundred seventy-two
=
Copyright © Macmillan/McGraw-Hill, a division of The McGraw-Hill Companies, Inc.
98 -
=
-
=
7. 75 - 53
=
26 -
5. 75 - 21
Name
Use
Subtract.
11. 47 - 24
and
47 -
=
. Take apart the numbers.
C13-009A-112051.ai
C13-009A-112051.ai
-
68 -
-
79 -
=
-
=
15. 36 - 36
Copyright © Macmillan/McGraw-Hill, a division of The McGraw-Hill Companies, Inc.
=
14. 79 - 45
=
36 -
=
-
=
13. 29 - 14
29 -
12. 68 - 47
=
16. 37 - 15
37 -
=
-
=
=
-
=
17. 59 - 38
59 -
=
-
Chapter 13 • Lesson 2C
=
five hundred seventy-three
573
Solve.
18. There were 96 leaves on the tree.
63 leaves fell off of the tree.
How many leaves are left on the tree?
-
-
=
=
leaves
19. The bowl held 89 pieces of popcorn.
Sid ate 48 pieces. How many pieces
of popcorn are left?
-
=
=
20.
pieces of popcorn
How do you take apart a
two-digit number?
574
five hundred seventy-four
Math at Home Activity: Show your child a number. Have him or her
draw the number, in tens and ones. Show your child another number.
Have him or her break apart that number into tens and ones. Have your
child subtract the tens and then the ones.
Copyright © Macmillan/McGraw-Hill, a division of The McGraw-Hill Companies, Inc.
-