Name
Copyright © The M
cGraw
-Hill Com
panies, Inc. Permission is granted to reproduce for classroom
use.Lesson 1 Reteach
Take Apart Hundreds to Subtract
Mental math can make subtraction easier.
600 - 99 = 501
100 500
100 - 99 = 1
500 + 1 = 501
Break apart hundreds to subtract mentally.
1. 303 - 98 = / \
100 203
100 - 98 =
203 + =
3. 360 - 99 = / \
- =
+ =
2. 500 - 97 = / \
100 - 97 =
400 + =
4. 304 - 98 = / \
- =
+ =
You can break apart 600 to be 100 and 500.
99 is 1 away from 100.Add the 1 to 500 to get
your answer.
60 Grade 2 • Chapter 7 Subtract Three-Digit Numbers
Program: My Math 2013
Vendor: Aptara
Component: C07_Reteach
Grade: 2
PDF Proof
060_069_CCSS_C07_RT_116214.indd Page 60 01/06/11 12:07 AM s-20060_069_CCSS_C07_RT_116214.indd Page 60 01/06/11 12:07 AM s-20 /Volumes/146/GO00807/MY_MATH_2013/ANCILLARY/G2/RETEACH/002_116214_X_P1.../Volumes/146/GO00807/MY_MATH_2013/ANCILLARY/G2/RETEACH/002_116214_X_P1...
Name Co
pyri
ght
© T
he M
cGra
w-H
ill C
ompa
nies
, Inc
. Per
mis
sion
is g
rant
ed t
o re
prod
uce
for
clas
sroo
m u
se.
Lesson 2 Reteach
Subtract Hundreds
Find 600 - 300.
6 hundreds - 3 hundreds = hundreds
600 - 300 =
Subtract.
1. 4 hundreds - 1 hundred = hundreds
400 - 100 =
2. 7 hundreds - 3 hundreds = hundreds
700 - 300 =
3. 8 hundreds - 5 hundreds = hundreds
800 - 500 =
4. 600 500 800 600 500 - 100 - 200 - 300 - 200 - 100
Grade 2 • Chapter 7 Subtract Three-Digit Numbers 61
Program: My Math 2013
Vendor: Aptara
Component: C07_Reteach
Grade: 2
PDF Proof
060_069_CCSS_C07_RT_116214.indd Page 61 01/06/11 12:07 AM s-20060_069_CCSS_C07_RT_116214.indd Page 61 01/06/11 12:07 AM s-20 /Volumes/146/GO00807/MY_MATH_2013/ANCILLARY/G2/RETEACH/002_116214_X_P1.../Volumes/146/GO00807/MY_MATH_2013/ANCILLARY/G2/RETEACH/002_116214_X_P1...
Name
Copyright © The M
cGraw
-Hill Com
panies, Inc. Permission is granted to reproduce for classroom
use.Lesson 3 Reteach
Mentally Subtract 10 or 100
Mentally subtract 100.
300 - 200
3 - 2 = 1So, 300 - 200 = 100 .
Mentally subtract 10.
230 - 10
3 - 1 = 2So, 230 - 10 = 220 .
Subtract.
1. 500 - 200
5 - 2 = 3 So, 500 - 200 = 300 .
3. 600 - 300
6 - 3 =
So, 600 - 300 = .
5. 400 - 400
4 - 4 =
So, 400 - 400 = .
2. 650 - 20
5 - 2 =
So, 650 - 20 = .
4. 870 - 10
7 - 1 =
So, 870 + 10 = .
6. 330 - 30
3 - 3 =
So, 330 - 30 = .
62 Grade 2 • Chapter 7 Subtract Three-Digit Numbers
Program: My Math 2013
Vendor: Aptara
Component: C07_Reteach
Grade: 2
PDF Proof
060_069_CCSS_C07_RT_116214.indd Page 62 01/06/11 12:07 AM s-20060_069_CCSS_C07_RT_116214.indd Page 62 01/06/11 12:07 AM s-20 /Volumes/146/GO00807/MY_MATH_2013/ANCILLARY/G2/RETEACH/002_116214_X_P1.../Volumes/146/GO00807/MY_MATH_2013/ANCILLARY/G2/RETEACH/002_116214_X_P1...
Name Co
pyri
ght
© T
he M
cGra
w-H
ill C
ompa
nies
, Inc
. Per
mis
sion
is g
rant
ed t
o re
prod
uce
for
clas
sroo
m u
se.
Lesson 4 Reteach
Regroup Tens
hundreds tens ones
1 6 3 - 1 3 5
Remember: Regroup 1 ten as 10 ones.
Use the base-ten blocks to subtract.
1. hundreds tens ones
4 3 7 - 2 1 8
Use base-ten blocks and WorkMat 7. Subtract.
2. 321 - 13 = 3. 549 - 211 =
4. 869 - 5 = 5. 623 - 415 =
6. 460 - 152 = 7. 708 - 26 = Grade 2 • Chapter 7 Subtract Three-Digit Numbers 63
Program: My Math 2013
Vendor: Aptara
Component: C07_Reteach
Grade: 2
PDF Proof
060_069_CCSS_C07_RT_116214.indd Page 63 01/06/11 12:07 AM s-20060_069_CCSS_C07_RT_116214.indd Page 63 01/06/11 12:07 AM s-20 /Volumes/146/GO00807/MY_MATH_2013/ANCILLARY/G2/RETEACH/002_116214_X_P1.../Volumes/146/GO00807/MY_MATH_2013/ANCILLARY/G2/RETEACH/002_116214_X_P1...
Name
Copyright © The M
cGraw
-Hill Com
panies, Inc. Permission is granted to reproduce for classroom
use.Lesson 5 Reteach
Regroup Hundreds
Step 1 Step 2 Step 3
Subtract the ones. Subtract the tens. Subtract the
Write how many Regroup 1 hundred hundreds.
ones are left. as 10 tens. Write Write how many the new number of hundreds hundreds and tens in are left. the boxes.
hundreds tens ones
2 1 7 - 1 3 4
hundreds tens ones
2 1 7 - 1 3 4
hundreds tens ones
2 1 7 - 1 3 4
Use base-ten blocks and WorkMat 7. Subtract.
1. 827 - 433 = 2. 245 - 153 =
3. 597 - 489 = 4. 762 - 234 =
5. 624 - 325 = 6. 943 - 144 = 64 Grade 2 • Chapter 7 Subtract Three-Digit Numbers
Program: My Math 2013
Vendor: Aptara
Component: C07_Reteach
Grade: 2
PDF Proof
060_069_CCSS_C07_RT_116214.indd Page 64 01/06/11 12:07 AM s-20060_069_CCSS_C07_RT_116214.indd Page 64 01/06/11 12:07 AM s-20 /Volumes/146/GO00807/MY_MATH_2013/ANCILLARY/G2/RETEACH/002_116214_X_P1.../Volumes/146/GO00807/MY_MATH_2013/ANCILLARY/G2/RETEACH/002_116214_X_P1...
Name Co
pyri
ght
© T
he M
cGra
w-H
ill C
ompa
nies
, Inc
. Per
mis
sion
is g
rant
ed t
o re
prod
uce
for
clas
sroo
m u
se.
Lesson 6 Reteach
Three-Digit Subtraction
Step 1 Subtract ones.
You cannot take 7 ones from 4 ones.Regroup 1 ten as 10 ones.Now you can subtract 7.
Step 2 Subtract tens.
You can cross out 3 rods.
Step 3 Subtract hundreds.
You can cross out 1 flat.
Count the blocks you have left.You have 1 flat and 7 cubes.
244 - 137 =
You can use base-ten blocks to help subtract
three-digit numbers.
Hundreds Tens Ones
2 4 4 - 1 3 7
Grade 2 • Chapter 7 Subtract Three-Digit Numbers 65
Program: My Math 2013
Vendor: Aptara
Component: C07_Reteach
Grade: 2
PDF Proof
060_069_CCSS_C07_RT_116214.indd Page 65 01/06/11 12:07 AM s-20060_069_CCSS_C07_RT_116214.indd Page 65 01/06/11 12:07 AM s-20 /Volumes/146/GO00807/MY_MATH_2013/ANCILLARY/G2/RETEACH/002_116214_X_P1.../Volumes/146/GO00807/MY_MATH_2013/ANCILLARY/G2/RETEACH/002_116214_X_P1...
Name
Copyright © The M
cGraw
-Hill Com
panies, Inc. Permission is granted to reproduce for classroom
use.Lesson 7 Reteach
Rewrite Three-Digit Subtraction
You can write a subtraction fact two different
ways.
548548 – 230 = 318 is the same as - 230
318
Subtract.
1. 708 708 – 501 = is the same as - 501
2. 100 100 – 75 = is the same as - 75
3. 369 369 – 258 = is the same as - 258
4. 602 602 – 199 = is the same as - 199
66 Grade 2 • Chapter 7 Subtract Three-Digit Numbers
Program: My Math 2013
Vendor: Aptara
Component: C07_Reteach
Grade: 2
PDF Proof
060_069_CCSS_C07_RT_116214.indd Page 66 01/06/11 12:07 AM s-20060_069_CCSS_C07_RT_116214.indd Page 66 01/06/11 12:07 AM s-20 /Volumes/146/GO00807/MY_MATH_2013/ANCILLARY/G2/RETEACH/002_116214_X_P1.../Volumes/146/GO00807/MY_MATH_2013/ANCILLARY/G2/RETEACH/002_116214_X_P1...
Name Co
pyri
ght
© T
he M
cGra
w-H
ill C
ompa
nies
, Inc
. Per
mis
sion
is g
rant
ed t
o re
prod
uce
for
clas
sroo
m u
se.
Lesson 8 Reteach (1)
Problem Solving STRATEGY: Write a Number Sentence
There were 185 apples growing
on a tree. Andrew and his sister
picked 62 apples and put them
in the basket. How many apples
are left on the tree?
What do I know?
There are 185 apples on the tree. 62 apples were picked.
What do I need to find?
How many apples are left on the tree?
Understand
Step 1
Plan
Step 2
Solve
Step 3 Write a Number Sentence.
185
62 ?
185 - 62 = 123 apples left
Check
Step 4Is my answer reasonable?
How do I know?
How will I solve the problem?
I can write a number sentence.
Grade 2 • Chapter 7 Subtract Three-Digit Numbers 67
Program: My Math 2013
Vendor: Aptara
Component: C07_Reteach
Grade: 2
PDF Proof
060_069_CCSS_C07_RT_116214.indd Page 67 01/06/11 12:07 AM s-20060_069_CCSS_C07_RT_116214.indd Page 67 01/06/11 12:07 AM s-20 /Volumes/146/GO00807/MY_MATH_2013/ANCILLARY/G2/RETEACH/002_116214_X_P1.../Volumes/146/GO00807/MY_MATH_2013/ANCILLARY/G2/RETEACH/002_116214_X_P1...
Name
Copyright © The M
cGraw
-Hill Com
panies, Inc. Permission is granted to reproduce for classroom
use.Lesson 8 Reteach (2)
Problem Solving STRATEGY: Write a Number Sentence
Write a number sentence to solve.
1. Tara bought 79 paints at the art supply store. She bought 100 brushes. How many more brushes did she buy?
brushes
2. Cameron’s Corner Coffee Shop sold 962 cups of coffee in the morning and 491 cups in the afternoon. How many more cups of coffee did Cameron sell in the morning?
cups of coffee
3. The school library has a goal to receive 800 books during a book drive. So far, they have received 543 books. How many more books do they need to reach their goal?
books
4. Brayden took a math test with 200 questions. He got 188 questions right. How many questions did he miss?
questions68 Grade 2 • Chapter 7 Subtract Three-Digit Numbers
Program: My Math 2013
Vendor: Aptara
Component: C07_Reteach
Grade: 2
PDF Proof
060_069_CCSS_C07_RT_116214.indd Page 68 01/06/11 12:07 AM s-20060_069_CCSS_C07_RT_116214.indd Page 68 01/06/11 12:07 AM s-20 /Volumes/146/GO00807/MY_MATH_2013/ANCILLARY/G2/RETEACH/002_116214_X_P1.../Volumes/146/GO00807/MY_MATH_2013/ANCILLARY/G2/RETEACH/002_116214_X_P1...
Name Co
pyri
ght
© T
he M
cGra
w-H
ill C
ompa
nies
, Inc
. Per
mis
sion
is g
rant
ed t
o re
prod
uce
for
clas
sroo
m u
se.
You can use place-value charts to help you
regroup across zeros.
Find 305 - 176.
Step 1 Step 2 Step 3
Subtract the ones.No tens to regroup.Regroup the hundreds.
Regroup the tens. Subtract the ones, tens, and hundreds.
hundreds tens ones
3 0 5 – 1 7 6
hundreds tens ones
3 0 5 – 1 7 6
hundreds tens ones
3 0 5 – 1 7 6 1 2 9
Subtract. Check your answer.
1. 106 - 28
6. 205 - 92
2. 503 - 167
7. 308 - 175
3. 405 - 218
8. 300 - 56
4. 601 - 378
9. 505 - 90
5. 200 - 145
10. 802 - 132
11. 500 - 418 = 12. 206 - 138 =
13. 801 - 482 = 14. 100 - 33 =
15. 607 - 527 = 16. 700 - 19 =
Lesson 9 Reteach
Subtract Across Zeros
Grade 2 • Chapter 7 Subtract Three-Digit Numbers 69
Program: My Math 2013
Vendor: Aptara
Component: C07_Reteach
Grade: 2
PDF Proof
060_069_CCSS_C07_RT_116214.indd Page 69 01/06/11 12:07 AM s-20060_069_CCSS_C07_RT_116214.indd Page 69 01/06/11 12:07 AM s-20 /Volumes/146/GO00807/MY_MATH_2013/ANCILLARY/G2/RETEACH/002_116214_X_P1.../Volumes/146/GO00807/MY_MATH_2013/ANCILLARY/G2/RETEACH/002_116214_X_P1...
Top Related