Reteach
Chapter 1
Grade 2
Name
Lesson 1
Reteach
Addition Properties
2+3=
5
4+0=
4
3+2=
5
0+4=
4
The order of the addends
changed. The sum is the same.
Add 0 to a number. The sum
is the same as the other addend.
Find each sum.
Copyright © The McGraw-Hill Companies, Inc. Permission is granted to reproduce for classroom use.
1.
8+4=
12
4+8=
12
3.
2.
5+0=
0+5=
4.
3+4=
1+8=
4+3=
8+1=
5.
6.
5+3=
6+5=
3+5=
5+6=
Grade 2 • Chapter 1 Apply Addition and Subtraction Concepts
3
Name
Lesson 2
Reteach
Count On to Add
You can use squares to count on.
Find 5 + 3. Start at 5. Count on 3.
5+3=
1 2 3 4 5 6 7 8
8
5
+3
8
Use the squares. Add squares to count on.
1. 8 + 1 =
9
Copyright © The McGraw-Hill Companies, Inc. Permission is granted to reproduce for classroom use.
2. 6 + 2 =
3. 7 + 3 =
4. 5 + 1 =
5. 9 + 3 =
6. 7 + 2 =
7. 6 + 3 =
4
Grade 2 • Chapter 1 Apply Addition and Subtraction Concepts
Name
Lesson 3
Reteach
Doubles and Near Doubles
Addends that are the same are called doubles.
Two addends that are almost doubles are near
doubles.
3 + 3
=
addend addend
6
3
+
4
=
7
Copyright © The McGraw-Hill Companies, Inc. Permission is granted to reproduce for classroom use.
Add. Use doubles.
1. 4 + 4 =
3. 2 + 3 =
8
2. 6 + 5 =
4. 5 + 5 =
Grade 2 • Chapter 1 Apply Addition and Subtraction Concepts
5
Name
Lesson 4
Reteach
Make a 10
8+3=?
You can make a 10 to find 8 + 3:
1. Add to 8 to make 10.
2. Subtract the same number
from 3.
8 + 2 = 10
3-2= 1
3. Add the sum and difference.
4. The answer is also the sum of
8 + 3.
10 + 1 = 11
We know that 10 + 1 equals 11, so 8 + 3 also equals 11.
10 + 1 = 11 and 8 + 3 = 11
1.
2.
7+6=?
9+5=?
9+
= 10
5-
+
=
So, 9 + 5 =
6
.
=
7+
= 10
6-
+
=
So, 7 + 6 =
=
.
Grade 2 • Chapter 1 Apply Addition and Subtraction Concepts
Copyright © The McGraw-Hill Companies, Inc. Permission is granted to reproduce for classroom use.
Make a 10 to add. Use the example above for help.
Name
Lesson 5
Reteach
Add Three Numbers
You can group addends.
You can use doubles or
make a 10.
Find a double.
Make a 10.
4
3
8
+4 +3
6
5
+4
11
10
+5
15
Find a double. Circle addends that make
doubles. Add.
1.
3
3
+7
6
+7
4
2
4
+2 + 4
4
5
8
+4 +5
3
7
6
+3 +7
5
5 10
+2 +2
Copyright © The McGraw-Hill Companies, Inc. Permission is granted to reproduce for classroom use.
13
Make a 10. Circle addends that make a 10. Add.
2.
8
2
+4
10
+4
14
4
3
10
+6 + 3
1
9 10
+4 + 4
8
7
8
+ 3 + 10
5
6
10
+5 + 6
9
9
+2
2
8
7
7
0
0
+ 8 +10 + 8 +16
Find the sum.
3.
8
3
+8
3
+16
8
9
+1
8
+10
Grade 2 • Chapter 1 Apply Addition and Subtraction Concepts
18
+2
7
Name
Lesson 6
Reteach (1)
Problem Solving
STRATEGY: Write a Number Sentence
Sanders’ Orchard sells bags of
apples. Malia buys 4 bags. Steve
buys 2 bags. How many bags of
apples do they buy in all?
Step 1
Understand
What do I know?
Malia buys 4 bags. Steve buys 2 bags.
The total number of bags of apples Steve and
Malia buy?
Step 2
Plan
How will I solve?
Step 3
Solve
Write a number sentence.
I will write a number sentence.
4+2=6
bags of apples
Step 4
Check
8
Is my answer reasonable?
Grade 2 • Chapter 1 Apply Addition and Subtraction Concepts
Copyright © The McGraw-Hill Companies, Inc. Permission is granted to reproduce for classroom use.
What do I need to find?
Name
Lesson 6
Reteach (2)
Problem Solving
STRATEGY: Write a Number Sentence
Write a number sentence to solve.
Copyright © The McGraw-Hill Companies, Inc. Permission is granted to reproduce for classroom use.
1. A.J., Seth, and Lily each
have 1 box of pencils. There
are 5 pencils in each box.
How many pencils do they
have in all?
+
+
pencils
2. Johnny buys 3 bottles of
juice for a party. He decides
to buy 6 more bottles. How
many total bottles does
Johnny buy?
+
3. Steffan has 3 sunflowers
and 5 tulips in his garden.
How many flowers are there
in all?
+
4. Mateo saw 3 red tricycles
and 3 blue tricycles coming
down the sidewalk. How many
tricycles did he see in all?
+
5. Aiden has 7 robot stickers
and 5 alien stickers on his
folder. How many stickers
in all?
+
Grade 2 • Chapter 1 Apply Addition and Subtraction Concepts
=
=
bottles
=
flowers
=
tricycles
=
stickers
9
Name
Lesson 7
Reteach
Count Back to Subtract
Count back
to subtract.
8-2=
Count back
to subtract.
6
9
10 - 1 =
Count back to subtract. Show how you use
to help.
1.
3
9-3=
5.
4.
7
6.
8.
8-6=
9-2=
6-2=
5-1=
7.
6
9-1=
9.
4-3=
7-3=
Grade 2 • Chapter 1 Apply Addition and Subtraction Concepts
Copyright © The McGraw-Hill Companies, Inc. Permission is granted to reproduce for classroom use.
7-4=
10
3.
2.
Name
Lesson 8
Reteach
Subtract All and Subtract Zero
5-0=
5
5-5=
Subtract 0.
You have the same number left.
0
Subtract all.
You have 0 left.
Subtract. You can cross out pictures to help.
Copyright © The McGraw-Hill Companies, Inc. Permission is granted to reproduce for classroom use.
1.
2.
9-0=
9
6-0=
9-9=
0
6-6=
3.
4.
4-0=
7-0=
4-4=
7-7=
5.
6.
5-0=
8-0=
5-5=
8-8=
Grade 2 • Chapter 1 Apply Addition and Subtraction Concepts
11
Name
Lesson 9
Reteach
Use Doubles to Subtract
You can use doubles facts to subtract.
Remember, doubles are
addends that are the same
number.
If you know 6 + 6 = 12, you know 12 - 6 =
6
.
Subtract. Use doubles facts to help.
1.
2.
8-4=
8
, so
7+7=
, so
.
14 - 7 =
.
4.
3.
3+3=
, so
5+5=
, so
6-3=
.
10 - 5 =
.
5. 8 + 8 =
16 - 8 =
12
, so
.
6. 9 + 9 =
18 - 9 =
, so
.
Grade 2 • Chapter 1 Apply Addition and Subtraction Concepts
Copyright © The McGraw-Hill Companies, Inc. Permission is granted to reproduce for classroom use.
4+4=
Name
Lesson 10
Reteach
Relate Addition and Subtraction
8+4=
12
12 - 4 =
8
These addition and
subtraction facts
have the same three
numbers.
Use addition facts to subtract.
2.
1.
4+7=
Copyright © The McGraw-Hill Companies, Inc. Permission is granted to reproduce for classroom use.
11 - 7 =
3.
11
4
3+6=
9-3=
4.
9+3=
2+5=
12 - 3 =
7-5=
5.
6.
2+8=
1+6=
10 - 2 =
7-6=
Grade 2 • Chapter 1 Apply Addition and Subtraction Concepts
13
Name
Lesson 11
Reteach
Missing Addends
9+
= 14
Write a related fact.
Related facts use the
same numbers.
14 - 9 =
So, 9 +
5
5
= 14.
Find the missing addend. Draw pictures to help.
1. 8 +
4
= 12
2. 7 +
4
Copyright © The McGraw-Hill Companies, Inc. Permission is granted to reproduce for classroom use.
12 - 8 =
= 12
12 - 7 =
3. 5 +
= 13
13 - 5 =
4. 9 +
= 17
17 - 9 =
14
Grade 2 • Chapter 1 Apply Addition and Subtraction Concepts
Name
Lesson 12
Reteach
Fact Families
Some fact families have two addition facts and two
subtraction facts.
9+7=
16
16 - 7 =
9
7+9=
16
16 - 9 =
7
Some fact families have one addition fact and one
subtraction fact.
8+8=
16
16 - 8 =
8
Copyright © The McGraw-Hill Companies, Inc. Permission is granted to reproduce for classroom use.
Complete each fact family.
1.
2.
3.
4.
9+4=
13
13 - 9 =
4
4+9=
13
13 - 4 =
9
6+5=
11 - 5 =
5+6=
11 - 6 =
9+8=
17 - 9 =
8+9=
17 - 8 =
7+7=
14 - 7 =
Grade 2 • Chapter 1 Apply Addition and Subtraction Concepts
15
Name
Lesson 13
Reteach
Two-Step World Problems
You can draw a model to help solve two-step
word problems.
Mia had 3 friends over for a party. 2 more friends came. Then
3 more friends came late. How many friends are over now?
Step 1
3 friends were over
Step 2
5 friends are over
2 more came
3 + 2 = 5 friends
3 more friends
came late
5 + 3 = 8 friends
1. Ella found 2 pens in her room. She found 4 more pens in the
kitchen. Ella then found 2 more pens in her brother’s room.
How many pens did Ella find in all?
Step 1:
+
=
Step 2:
+
=
pens
2. Ryan saw 8 birds in a tree. 2 flew away. Ryan went outside,
and 3 more birds flew away. How many birds are left?
Step 1:
16
-
=
Step 2:
-
=
pens
Grade 2 • Chapter 1 Apply Addition and Subtraction Concepts
Copyright © The McGraw-Hill Companies, Inc. Permission is granted to reproduce for classroom use.
On a separate sheet of paper, draw a model to
help solve. Then, write the number sentences.