EM3MRB_G1-2_30a-30b_ALG_CA
10/9/08
6:18 PM
Page 34
Operations and Computation
You can also use trade-first subtraction to subtract
numbers having more than two digits.
352 168 ?
1. Look at the 1s place.
You cannot take 8 ones from 2 ones
without getting a negative number.
2. So trade 1 ten for 10 ones.
5 tens 1 ten 4 tens
2 ones 10 ones 12 ones
3. Look at the 10s place. You cannot
take 6 tens from 4 tens without
getting a negative number.
35A
100s 10s
3
1
5
6
100s 10s
3
1
4
5
6
100s 10s
3
1
4
5
6
1s
2
8
1s
12
2
8
1s
12
2
8
EM3MRB_G1-2_30a-30b_ALG_CA
9/19/08
11:59 AM
Page 35
Operations and Computation
4. So trade 1 hundred for 10 tens.
3 hundreds 1 hundred 2 hundreds
4 tens 10 tens 14 tens
5. Now subtract the hundreds,
the tens, and the ones.
100s 10s
1s
14
4
5
6
12
2
8
100s 10s
1s
14
4
5
6
8
12
2
8
4
2
3
1
2
3
1
1
352 168 184
35B
EM3MRB_G1-2_30a-30b_ALG
10/23/08
4:20 PM
Page 36
Operations and Computation
You can also use U.S. traditional subtraction
to subtract.
352 168 ?
1. Start with the 1s.
Since 8 2, you need to regroup.
Trade 1 ten for 10 ones:
352 3 hundreds 4 tens 12 ones.
Subtract the 1s: 12 8 4.
4
12
3
1
5
6
2
2. Go to the 10s.
Since 6 4, you need to regroup.
2
Trade 1 hundred for 10 tens:
3
352 2 hundreds 14 tens 12 ones.
1
Subtract the 10s: 14 6 8.
14
4
35C
5
6
8
8
4
12
2
8
4
EM3MRB_G1-2_30a-30b_ALG
11/4/08
6:18 PM
Page 37
Operations and Computation
3. Go to the 100s.
You don’t need to regroup.
Subtract the 100s: 2 1 1.
352 168 184
14
2
3
1
1
4
5
6
8
12
2
8
4
Try It Together
Subtract two numbers with three or more digits. Show a
partner what you did.
35D
Date
Time
PROJECT
2
U.S. Traditional Subtraction 1
Algorithm Project 2
Use any strategy to solve the problem.
1. Jakob has 342 red blocks
and 168 blue blocks in his
toy box. How many more
red blocks than blue blocks
are in the toy box?
red blocks
Use U.S. traditional subtraction to solve each problem.
2.
96
- 47
−−−
3.
285
- 143
−−−−
4.
543
- 89
−−−−
5.
381
- 184
−−−−
6.
452
- 176
−−−−
7.
808
- 259
−−−−
Go to www.everydaymathonline.com for additional practice pages.
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5P
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Date
Time
PROJECT
2
U.S. Traditional Subtraction 2
Algorithm Project 2
Use U.S. traditional subtraction to solve each problem.
1. Rosa had 213 baseball cards.
She gave 138 cards to her
friend Andre. How many
cards does she have left?
baseball cards
2.
371
- 89
−−−−
3.
346
- 248
−−−−
4.
493
- 156
−−−−
5.
354
- 265
−−−−
6.
305
- 167
−−−−
7.
250
- 175
−−−−
6P
Go to www.everydaymathonline.com for additional practice pages.
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Date
Time
PROJECT
U.S. Traditional Subtraction 3
2
Algorithm Project 2
Use U.S. traditional subtraction to solve each problem.
1. There are 124 children who ride a
bus to school. 65 of them are boys.
How many girls ride a bus to school?
girls
2. Write a number story for 327 - 68.
Solve your number story.
Fill in the missing numbers in the subtraction problems.
4.
3.
13
3
-
5
4
7
2
5
8
-
4
0
3
1
2
7
5
0
9
1
1
9
2
8
5.
6.
2
-
9
1
4
6
4
-
9
Go to www.everydaymathonline.com for additional practice pages.
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7P
11/4/08 11:37:25 AM
Date
Time
PROJECT
U.S. Traditional Subtraction 4
2
Algorithm Project 2
Use U.S. traditional subtraction to solve each problem.
1. Jenna’s book has 297 pages. Shen’s
book has 346 pages. How many
more pages are in Shen’s book?
pages
2. Write a number story for 405 - 268.
Solve your number story.
Fill in the missing digits in the subtraction problems.
3.
4.
17
3
-
8
4
9
7
15
2
-
6
3
6
4
7
9
6.
5.
7
4
-
5
6
8
1
7
9
8
8P
-
8
5
0
1
9
9
5
Go to www.everydaymathonline.com for additional practice pages.
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Name
PROJECT
2
Date
Time
Online
Additional
Practice
Trade-First Subtraction
Algorithm Project 2
Use trade-first subtraction to solve each problem.
1. Meera had 217 rocks in
her collection. She gave
68 rocks to her sister.
How many rocks did she
have left?
rocks
2.
463
- 241
−−−−
3.
76
- 39
−−−
4.
179
- 97
−−−−
5.
403
- 368
−−−−
6.
453
- 94
−−−−
7.
886
- 288
−−−−
8A
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Name
PROJECT
2
Date
Time
Solving
LessonMultidigit
Title Subtraction Problems 1
Online
Additional
Practice
Algorithm Project 2
Use any strategy to solve the problems.
1. There are 334 buttons in a
box. 175 of the buttons are
round. How many buttons
are not round?
buttons
2.
607
- 418
−−−−
3.
472
- 321
−−−−
4.
90
- 18
−−−
5.
317
- 98
−−−−
6.
67
- 38
−−−
7.
761
- 468
−−−−
8B
EM3cuOP1_G2_P02_8A-8D.indd 8B
11/4/08 12:00:35 PM
Name
PROJECT
2
Date
Time
Solving Multidigit Subtraction Problems 2
Online
Additional
Practice
Algorithm Project 2
Use any strategy to solve the problems.
1. The library had a book sale.
On Saturday it raised $247.
On Sunday it raised $136.
How much more money did
the library raise on Saturday?
$
2.
94
- 65
−−−
3.
485
- 286
−−−−
4.
510
- 487
−−−−
5.
307
- 149
−−−−
6.
331
- 92
−−−−
7.
875
- 421
−−−−
8C
EM3cuOP1_G2_P02_8A-8D.indd 8C
11/4/08 12:00:45 PM
Name
PROJECT
2
Date
Time
Solving Multidigit Subtraction Problems 3
Online
Additional
Practice
Algorithm Project 2
Use any strategy to solve the problems.
1. Yesterday, Alex had $405 in
his bank account. He spent
$126 today. How much
money does he have left?
$
2.
215
- 136
−−−−
3.
83
- 64
−−−
4.
606
- 247
−−−−
5.
572
- 341
−−−−
6.
416
- 97
−−−−
7.
772
- 574
−−−−
8D
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