CCSS
Fluently
and subtract
within
1000numbers
using strategies and
NS 2.1G3.NBT.2
Find the sum
or add
difference
of two
whole
algorithms based on place value, properties of operations, and/or the relationship
between 0 and 10,000.
between addition and subtraction.
UNDERLYING SKILLS AND CONCEPTS:
addition basic facts;
expanded notation;
regroup ones for ten
Add 3-Digit Numbers
a
K
ey Ide
You can use models or place value to add three-digit numbers.
You may need to regroup, or trade, ones and tens.
E x am p l E
Maria read 167 pages last month. She read 285 pages this month.
How many pages did she read in these two months?
Find 167 + 285.
You can use a model.
You can use place value.
Step 1: Add the ones.
7 5 12
11
16 7
28 5
1 ten
and
2 ones
167
2
Step 2: Add the tens.
10 60 80 150
285
1 ten
carried over
from Step 1.
Step 2: Add in each place.
300 Step 3:
Add the parts.
140
1 hundred
and
5 tens
11111
167
2 8 5
52
Step 3: Add the hundreds.
12
300
140
12
452
100 100 200 400
4 hundreds
1 hundred
carried over
from Step 2.
111
1 67
2 85
4 52
Maria read 452 pages in two months.
page 54
Chapter 5 – Lesson 3
C – © CSL Associates, Inc. All rights reserved.
Step 1: Model each addend.
Name
P RAC T I C E
Add.
1.
218
129
2.
251
142
347
6.
393
175
119
7.
112
108
365
335
220
C – © CSL Associates, Inc. All rights reserved.
8.
580
12.
325
199
4.
524
325
255
294
11.
3.
450
229
700
249
151
400
5.
537
9.
679
13.
411
126
525
280
397
10.
805
14.
599
511
1,110
247
150
675
225
900
15.
432
348
780
Solve.
16. Miguel’s cat eats 28 ounces of
17. Mrs. Smith had 500 grams of
canned food each week. His dog
cheese. She made sandwiches.
eats 64 ounces each week. How
She had 200 grams of cheese
many ounces of food do his
left. How much cheese did she
pets eat each week?
use?
500 ? 200
She used 300 grams.
28 64 92 ounces
Math
Reasoning
Number Sense
MR 1.1
Match the problem to the sum.
18. 250 150 200
19. 75 125 300
20. 115 185 400
Chapter 5 – Lesson 3
page 55
MCX94.HW.CL.G3.FM&Lesson.v211
8/3/04
13:56
Page 38
Name
…at home!
P RAC T I C E
Add.
316
137
2.
453
6.
136
215
123
107
3.
407
188
394
7.
351
11.
243
151
230
541
139
595
235
425
8.
410
269
660
12.
4.
680
9.
255
208
679
245
355
13.
139
261
600
5.
379
10.
463
14.
488
422
400
910
217
162
765
125
890
15.
587
524
1,111
Solve.
16. Briana’s cat eats 24 ounces of
canned food each week. Her
dog eats 72 ounces each week.
How many ounces of food do
her pets eat each week?
17. Mrs. Jones had 500 grams of
cheese. She made sandwiches.
She had 300 grams of cheese
left. How much cheese did she
use?
24 72 96 ounces
500 ? 300
She used 200 grams.
Math
Reasoning
Number Sense
MR 1.1
Match the problem to the sum.
18. 350 250 300
19. 125 175 400
20. 285 115 600
page 38
Home Resource and Homework
Chapter 5 Lesson 3
C – © CSL Associates, Inc. All rights reserved.
1.
MCX94TEG3Ch01_32.v8.9.3 2/21/01 14:44 Page 103
Name
P RAC T I C E
Add.
1.
218
129
2.
251
142
347
6.
393
175
119
7.
112
108
4.
13.
700
411
126
5.
537
450
229
9.
679
365
335
220
C – © CSL Associates, Inc. All rights reserved.
8.
580
12.
325
199
524
325
255
294
11.
3.
525
280
397
10.
805
249
151
14.
400
599
511
1,110
247
150
675
225
900
15.
432
348
780
Solve.
16. Miguel’s cat eats 28 ounces of
17. Mrs. Smith had 500 grams of
canned food each week. His dog
cheese. She made sandwiches.
eats 64 ounces each week. How
She had 200 grams of cheese
many ounces of food do his
left. How much cheese did she
pets eat each week?
use?
500 ? 200
She used 300 grams.
28 64 92 ounces
Math
Reasoning
Number Sense
MR 1.1
Match the problem to the sum.
18. 250 150 200
19. 75 125 300
20. 115 185 400
Chapter 5 – Lesson 3
Student Book Page
page 55
Name
…at home!
P RAC T I C E
Add.
316
137
2.
453
6.
136
215
123
107
3.
407
188
394
7.
351
11.
243
151
230
541
139
595
235
425
8.
410
269
660
12.
4.
680
9.
255
208
679
245
355
13.
139
261
600
5.
379
10.
463
14.
488
422
400
910
217
162
765
125
890
15.
587
524
1,111
Solve.
16. Briana’s cat eats 24 ounces of
canned food each week. Her
dog eats 72 ounces each week.
How many ounces of food do
her pets eat each week?
17. Mrs. Jones had 500 grams of
cheese. She made sandwiches.
She had 300 grams of cheese
left. How much cheese did she
use?
24 72 96 ounces
500 ? 300
She used 200 grams.
Math
Reasoning
Number Sense
MR 1.1
Match the problem to the sum.
18. 350 250 300
19. 125 175 400
20. 285 115 600
page 38
Home Resource and Homework
Chapter 5 Lesson 3
C – © CSL Associates, Inc. All rights reserved.
1.