You can use a hundred chart
to add tens and ones.
1
2
3
4
5
6
7
8
For every ten you add,
move down 1 row.
20 is 2 tens.
Move down 2 rows.
9 10
11 12 13 14 15 16 17 18 19 20
21 22 23 24 25 26 27 28 29 30
4 + 20 = ?
Start on 4.
4 + 20 = 24
1
2
3
4
5
6
7
8
9 10
Check your work.
Start at 4.
Skip count by 10s.
4 , 14 , 24
So, 24 is
2 groups of 10
and 4 left over.
11 12 13 14 15 16 17 18 19 20
21 22 23 24 25 26 27 28 29 30
Use the part of the hundred chart
to add tens and ones.
Do You Understand?
Show Me! When you add
50 to 6, why is 6 the ones
digit in the sum? Explain.
422 four hundred twenty-two
1.
2 + 10 = 12
2.
5 + 30 =
3.
7 + 20 =
4.
9 + 40 =
5.
6 + 30 =
© Pearson Education, Inc. 1
1
11
21
31
41
2 3 4 5 6 7 8 9 10
12 13 14 15 16 17 18 19 20
22 23 24 25 26 27 28 29 30
32 33 34 35 36 37 38 39 40
42 43 44 45 46 47 48 49 50
Topic 8 Lesson 3
Name
Use the part of the hundred chart to add tens and ones.
1
11
21
31
41
6. 7
2 3 4 5 6 7 8 9 10
12 13 14 15 16 17 18 19 20
22 23 24 25 26 27 28 29 30 8. 9
32 33 34 35 36 37 38 39 40
42 43 44 45 46 47 48 49 50 10.3
+ 40 =
7. 8
+ 30 =
+ 10 =
9. 5
+ 10 =
+ 20 =
11.1
+ 40 =
Use the part of the hundred
chart above to solve.
12.Extend Your Thinking Sue had
some stickers in a book. She bought
30 more stickers. Now she has
36 stickers in her book. How many
stickers did Sue have in the book
at the start?
stickers
Topic 8 Lesson 3
13.Extend Your Thinking There are
40 people at a baseball game in the
morning. Some more people come to
the game in the afternoon. Now there
are 43 people at the game. How many
people came to the game in the
afternoon?
people
four hundred twenty-three 423
Use the hundred chart to solve each problem below.
1
2
3
4
5
6
7
8
9
10
11 12 13 14 15 16 17 18 19 20
21 22 23 24 25 26 27 28 29 30
14.Some hens laid 8 eggs. Then they laid
60 more eggs. How many eggs did the
hens lay in all?
eggs
31 32 33 34 35 36 37 38 39 40
41 42 43 44 45 46 47 48 49 50
51 52 53 54 55 56 57 58 59 60
61 62 63 64 65 66 67 68 69 70
71 72 73 74 75 76 77 78 79 80
81 82 83 84 85 86 87 88 89 90
15.4 students made it to the town fair early.
More students made it there on time.
There are 74 students at the fair.
How many students made it to the fair
on time?
91 92 93 94 95 96 97 98 99 100
16.8 people are on a bus. 50 people
are on a different bus. Which
number sentence shows how
many people are on both buses?
○○
○○
○○
○○
424 students
17.Extend Your Thinking Write a
number story for 3 + 40.
80 + 5 = 85
8 + 5 = 13
8 + 50 = 58
80 + 8 = 88
four hundred twenty-four
© Pearson Education, Inc. 1
Topic 8 Lesson 3