&&66
)OXHQWO\DGGDQGVXEWUDFWZLWKLQXVLQJVWUDWHJLHVDQG
NS 2.2*1%7
Find the sum
or difference of two whole numbers up to three
DOJRULWKPVEDVHGRQSODFHYDOXHSURSHUWLHVRIRSHUDWLRQVDQGRUWKHUHODWLRQVKLS
digits long.
EHWZHHQDGGLWLRQDQGVXEWUDFWLRQ
UNDERLYING SKILLS AND CONCEPTS:
addition basic fact;
regrouping
Add 3-Digit Numbers (sums " 1,000)
a
K
You can use basic facts and regrouping to add
ey Ide
two 3-digit numbers.
You may need to regroup ones to tens or tens to hundreds.
Sometimes you will need to regroup hundreds to thousands.
E x am p l E
1
Add 675 ! 374.
Step 1:
Add the ones.
5!4"9
B – © CSL Associates, Inc. All rights reserved.
!
Step 2:
Add the tens and regroup.
7 ! 7 " 14
6 7 5
5
3 7 4 !4
9
1
6 7 5
70
3 7 4 ! 70
4 9 140
!
9
E x am p l E
Step 3:
Add the hundreds.
1 ! 6 ! 3 " 10
1
6 7 5
!
3 7 4
1, 0 4 9
100
600
! 300
1000
2
Add 857 ! 394.
Step 1:
Add the ones and regroup.
7 ! 4 " 11
!
1
8 5 7
5
3 9 4 !4
1
11
Chapter 8 – Lesson 4
Step 2:
Add the tens and regroup.
1 ! 5 ! 9 " 15
!
1 1
10
8 5 7
50
3 9 4 ! 90
5 1 150
Step 3:
Add the hundreds.
1 ! 8 ! 3 " 12
1
!
8 5 7
3 9 4
1, 2 5 1
100
800
! 300
1200
page 93
Name
P RAC T I C E
Add.
823
623
2
436
347
1,446
5
746
328
783
6
1,074
9
678
542
1,220
Math
Reasoning
13
3
843
592
976
328
1,304
4
517
249
815
7
1,435
10
642
173
529
736
766
8
1,265
11
725
494
1,219
634
683
1,317
12
586
629
1,215
Adding
MR 1.0
What is the largest number you can add to 699 without
regrouping the hundreds?
300
page 94
Chapter 8 – Lesson 4
B – © CSL Associates, Inc. All rights reserved.
1
Name
P RAC T I C E
Add.
548
237
2
101
867
785
5
968
653
349
6
1,002
9
10
1,610
13
852
578
766
988
1,754
121
876
4
254
371
997
7
1,430
748
862
Math
Reasoning
3
533
789
625
8
1,322
11
865
284
1,149
621
699
1,320
12
896
630
1,526
Adding
MR 1.0
What is the largest number you can add to 499 without
regrouping the hundreds?
500
page 64
Home Resource and Homework
Chapter 8 Lesson 4
B – © CSL Associates, Inc. All rights reserved.
1
MCX94TEG2Ch01_30.v9.4.1 2/19/01 19:46 Page 173
Name
P RAC T I C E
Add.
1
823
623
2
436
347
1,446
5
783
746
328
6
1,074
9
10
B – © CSL Associates, Inc. All rights reserved.
1,220
13
843
592
976
328
1,304
642
173
4
517
249
815
7
1,435
678
542
Math
Reasoning
3
529
736
766
8
1,265
11
725
494
1,219
634
683
1,317
12
586
629
1,215
Adding
MR 1.0
What is the largest number you can add to 699 without
regrouping the hundreds?
300
Chapter 8 – Lesson 4
Student Book Page
page 94
Name
P RAC T I C E
Add.
548
237
2
101
867
785
5
968
653
349
6
1,002
9
10
1,610
13
852
578
766
988
1,754
121
876
4
254
371
997
7
1,430
748
862
Math
Reasoning
3
533
789
625
8
1,322
11
865
284
1,149
621
699
1,320
12
896
630
1,526
Adding
MR 1.0
What is the largest number you can add to 499 without
regrouping the hundreds?
500
page 64
Home Resource and Homework
Chapter 8 Lesson 4
B – © CSL Associates, Inc. All rights reserved.
1