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Subtraction Mastery • Sequence • Lenny.com

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Subtraction Mastery

A three-day intervention sequence designed for resource math groups targeting standard algorithm subtraction with 3-digit numbers within 1,000. Features systematic, mixed practice across single regrouping, double regrouping, and borrowing across zeros for Tuesday, Wednesday, and Thursday.

Tuesday Subtraction

Tuesday resource math intervention session focusing on 20 algorithm subtraction problems within 1,000. Provides structured place-value scaffolds for single regrouping, double regrouping, and borrowing across zeros.

Wednesday Subtraction

Wednesday resource math intervention session featuring 20 fresh algorithm subtraction problems within 1,000, continuing deliberate practice across all three borrowing configurations.

Thursday Subtraction

Thursday resource math intervention session providing 20 culminating algorithm subtraction problems within 1,000 to solidify student confidence and algorithm fluency.

Subtraction Mastery

A three-day intervention sequence designed for resource math groups targeting standard algorithm subtraction with 3-digit numbers within 1,000. Features systematic, mixed practice across single regrouping, double regrouping, and borrowing across zeros for Tuesday, Wednesday, and Thursday.

Tuesday Subtraction Packet

Tuesday Math Set A • Part 1

3-Digit Algorithm Subtraction

Name:

Date:

Step-by-Step: 1. Ones ➔ 2. Tens ➔ 3. Hundreds

More on the floor? Go next door!

1 #01

−

6 5 4

−

2 3 8

Check

2 #02

−

6 4 2

−

2 7 5

Check

3 #03

−

5 0 4

−

2 3 8

Check

4 #04

−

7 4 9

−

3 8 2

Check

5 #05

−

8 2 3

−

4 5 8

Check

6 #06

−

7 0 0

−

3 4 6

Check

7 #07

−

8 6 3

−

4 2 7

Check

8 #08

−

5 3 1

−

2 6 8

Check

9 #09

−

6 0 2

−

2 7 5

Check

10 #10

−

5 1 8

−

2 7 3

Check

Page 1 of 2 • Problems 1–10

Page 1 Score: / 10

Tuesday Math Set A • Part 2

3-Digit Algorithm Subtraction

Name:

Goal: 20 Accurate Differences

Zero Alert: When regrouping across zero in tens, borrow from hundreds first!

Check each column!

11 #11

−

7 1 4

−

3 8 9

Check

12 #12

−

8 0 0

−

4 6 3

Check

13 #13

−

9 7 2

−

5 4 6

Check

14 #14

−

9 5 2

−

4 7 6

Check

15 #15

−

4 0 7

−

1 8 9

Check

16 #16

−

6 3 7

−

1 8 5

Check

17 #17

−

6 2 5

−

3 6 8

Check

18 #18

−

9 0 0

−

5 2 8

Check

19 #19

−

4 8 5

−

2 4 9

Check

20 #20

−

7 4 3

−

2 8 7

Check

Page 2 of 2 • Problems 11–20

Total Tuesday Score: / 20

Tuesday Answer Key

Teacher Key Tuesday Solutions

Tuesday Subtraction: Master Key & Diagnostics

Resource Group Intervention

20 Algorithm Problems

Breakdown: ● 7 Regroup Once ● 7 Regroup Twice ● 6 Across Zeros

Verify regrouping marks in student boxes

1 654 − 238

= 416

Regroup Once (Tens) 14−8=6 | 4−3=1 | 6−2=4

Watch: Flipping digits (8−4=4) instead of borrowing.

11 714 − 389

= 325

Regroup Twice 14−9=5 | 10−8=2 | 6−3=3

Watch: Forgetting tens became 0 before borrowing from hundreds.

2 642 − 275

= 367

Regroup Twice 12−5=7 | 13−7=6 | 5−2=3

Watch: Reducing 4 to 3, but forgetting to borrow from 6.

12 800 − 463

= 337

Across Zeros 10−3=7 | 9−6=3 | 7−4=3

Watch: Tens place must become 9, not 10.

3 504 − 238

= 266

Across Zeros 14−8=6 | 9−3=6 | 4−2=2

Watch: Students skipping the 0 and borrowing directly from 5.

13 972 − 546

= 426

Regroup Once (Tens) 12−6=6 | 6−4=2 | 9−5=4

Watch: Unneeded borrowing in hundreds column.

4 749 − 382

= 367

Regroup Once (Hundreds) 9−2=7 | 14−8=6 | 6−3=3

Watch: Ones column needs NO borrowing (9 > 2).

14 952 − 476

= 476

Regroup Twice 12−6=6 | 14−7=7 | 8−4=4

Watch: 5 becomes 4, then needs regroup from 9.

5 823 − 458

= 365

Regroup Twice 13−8=5 | 11−5=6 | 7−4=3

Watch: 2 becomes 1, so 11−5=6 in tens column.

15 407 − 189

= 218

Across Zeros 17−9=8 | 9−8=1 | 3−1=2

Watch: 4 becomes 3; tens becomes 9.

6 700 − 346

= 354

Across Zeros 10−6=4 | 9−4=5 | 6−3=3

Watch: Writing 0−6=6. Reinforce 10−6=4.

16 637 − 185

= 452

Regroup Once (Hundreds) 7−5=2 | 13−8=5 | 5−1=4

Watch: Check that 7−5 was performed without borrowing.

7 863 − 427

= 436

Regroup Once (Tens) 13−7=6 | 5−2=3 | 8−4=4

Watch: 6 becomes 5. Don't borrow from 8.

17 625 − 368

= 257

Regroup Twice 15−8=7 | 11−6=5 | 5−3=2

Watch: 2 becomes 1; 11−6=5; 6 becomes 5.

8 531 − 268

= 263

Wednesday Subtraction Packet

Wednesday Math Set B • Part 1

3-Digit Algorithm Subtraction

Name:

Date:

Step-by-Step: 1. Ones ➔ 2. Tens ➔ 3. Hundreds

Write your regrouped numbers in the top boxes!

1 #01

−

7 3 4

−

3 6 8

Check

2 #02

−

7 6 5

−

3 2 8

Check

3 #03

−

6 0 5

−

2 4 7

Check

4 #04

−

5 2 1

−

2 7 6

Check

5 #05

−

8 3 9

−

4 7 2

Check

6 #06

−

8 0 0

−

3 5 4

Check

7 #07

−

8 4 3

−

4 8 5

Check

8 #08

−

5 8 4

−

2 4 7

Check

9 #09

−

5 0 3

−

1 6 8

Check

10 #10

−

6 1 5

−

2 4 8

Check

Page 1 of 2 • Problems 1–10

Page 1 Score: / 10

Wednesday Math Set B • Part 2

3-Digit Algorithm Subtraction

Name:

Goal: 20 Accurate Differences

Zero Alert: When regrouping across zero in tens, borrow from hundreds first!

Check each column!

11 #11

−

6 2 7

−

3 5 4

Check

12 #12

−

9 0 0

−

4 7 2

Check

13 #13

−

9 3 2

−

5 7 8

Check

14 #14

−

9 4 6

−

4 1 8

Check

15 #15

−

7 0 6

−

3 8 9

Wednesday Answer Key

Teacher Key Wednesday Solutions

Wednesday Subtraction: Master Key & Diagnostics

Resource Group Intervention

20 Algorithm Problems

Breakdown: ● 7 Regroup Once ● 7 Regroup Twice ● 6 Across Zeros

Verify regrouping marks in student boxes

1 734 − 368

= 366

Regroup Twice 14−8=6 | 12−6=6 | 6−3=3

Watch: 3 becomes 2; tens borrows to become 12; 7 becomes 6.

11 627 − 354

= 273

Regroup Once (Hundreds) 7−4=3 | 12−5=7 | 5−3=2

Watch: Ones column (7−4=3) needs no borrowing.

2 765 − 328

= 437

Regroup Once (Tens) 15−8=7 | 5−2=3 | 7−3=4

Watch: 6 becomes 5; tens (5−2=3) needs no hundreds borrow.

12 900 − 472

= 428

Across Zeros 10−2=8 | 9−7=2 | 8−4=4

Watch: 9 becomes 8; middle 0 becomes 9; ones becomes 10.

3 605 − 247

= 358

Across Zeros 15−7=8 | 9−4=5 | 5−2=3

Watch: Ensure tens place is treated as 9, not 10.

13 932 − 578

= 354

Regroup Twice 12−8=4 | 12−7=5 | 8−5=3

Watch: 3 becomes 2, then regroups from 9 to become 12.

4 521 − 276

= 245

Regroup Twice 11−6=5 | 11−7=4 | 4−2=2

Watch: 2 becomes 1; then 1 regroups to 11.

14 946 − 418

= 528

Regroup Once (Tens) 16−8=8 | 3−1=2 | 9−4=5

Watch: 4 becomes 3; 3−1=2 needs no borrow.

5 839 − 472

= 367

Regroup Once (Hundreds) 9−2=7 | 13−7=6 | 7−4=3

Watch: Ones place (9−2=7) requires no regrouping.

15 706 − 389

= 317

Across Zeros 16−9=7 | 9−8=1 | 6−3=3

Watch: 7 becomes 6; tens becomes 9.

6 800 − 354

= 446

Across Zeros 10−4=6 | 9−5=4 | 7−3=4

Watch: Zero in tens becomes 9, not 10.

16 453 − 187

= 266

Regroup Twice 13−7=6 | 14−8=6 | 3−1=2

Watch: 5 becomes 4, then regroups to 14.

7 843 − 485

= 358

Regroup Twice 13−5=8 | 13−8=5 | 7−4=3

Watch: 4 becomes 3; 13−8=5; 8 becomes 7.

17 758 − 291

= 467

Regroup Once (Hundreds) 8−1=7 | 15−9=6 | 6−2=4

Watch: 8−1=7 needs no borrow.

8 584 − 247

= 337

Regroup Once (Tens) 14−7=7 | 7−4=3 | 5−2=3

Thursday Subtraction Packet

Thursday Math Set C • Part 1

3-Digit Algorithm Subtraction

Name:

Date:

Step-by-Step: 1. Ones ➔ 2. Tens ➔ 3. Hundreds

Cross out digits carefully as you regroup!

1 #01

−

7 0 4

−

2 6 8

Check

2 #02

−

8 5 2

−

3 8 6

Check

3 #03

−

8 7 3

−

3 4 9

Check

4 #04

−

5 0 0

−

2 3 7

Check

5 #05

−

6 3 4

−

2 7 9

Check

6 #06

−

6 4 8

−

2 8 3

Check

7 #07

−

8 0 2

−

3 4 9

Check

8 #08

−

7 2 5

−

4 5 8

Check

9 #09

−

9 5 4

−

6 2 8

Check

10 #10

−

6 0 0

−

3 7 4

Check

Page 1 of 2 • Problems 1–10

Page 1 Score: / 10

Thursday Math Set C • Part 2

3-Digit Algorithm Subtraction

Name:

Goal: 20 Accurate Differences

Zero Alert: When regrouping across zero in tens, borrow from hundreds first!

Check each column!

11 #11

−

9 4 1

−

5 6 7

Check

12 #12

−

7 3 6

−

4 9 2

Check

13 #13

−

9 0 5

−

4 3 8

Check

14 #14

−

5 1 6

−

2 4 8

Check

15 #15

−

5 8 2

−

2 3 7

Thursday Answer Key

Teacher Key Thursday Solutions

Thursday Subtraction: Master Key & Diagnostics

Resource Group Intervention

20 Algorithm Problems

Breakdown: ● 7 Regroup Once ● 7 Regroup Twice ● 6 Across Zeros

Verify regrouping marks in student boxes

1 704 − 268

= 436

Across Zeros 14−8=6 | 9−6=3 | 6−2=4

Watch: 7 becomes 6; tens becomes 9, not 10.

11 941 − 567

= 374

Regroup Twice 11−7=4 | 13−6=7 | 8−5=3

Watch: 4 becomes 3; 13−6=7; 9 becomes 8.

2 852 − 386

= 466

Regroup Twice 12−6=6 | 14−8=6 | 7−3=4

Watch: 5 becomes 4, then regroups to 14.

12 736 − 492

= 244

Regroup Once (Hundreds) 6−2=4 | 13−9=4 | 6−4=2

Watch: Ones column (6−2=4) needs no borrow.

3 873 − 349

= 524

Regroup Once (Tens) 13−9=4 | 6−4=2 | 8−3=5

Watch: 7 becomes 6; 6−4=2 requires no hundreds borrow.

13 905 − 438

= 467

Across Zeros 15−8=7 | 9−3=6 | 8−4=4

Watch: 9 becomes 8; middle 0 becomes 9.

4 500 − 237

= 263

Across Zeros 10−7=3 | 9−3=6 | 4−2=2

Watch: Double zero: ones is 10, tens is 9, hundreds is 4.

14 516 − 248

= 268

Regroup Twice 16−8=8 | 10−4=6 | 4−2=2

Watch: 1 becomes 0, then regroups from 5 to 10.

5 634 − 279

= 355

Regroup Twice 14−9=5 | 12−7=5 | 5−2=3

Watch: 3 becomes 2; 12−7=5; 6 becomes 5.

15 582 − 237

= 345

Regroup Once (Tens) 12−7=5 | 7−3=4 | 5−2=3

Watch: 8 becomes 7; 7−3=4 needs no borrow.

6 648 − 283

= 365

Regroup Once (Hundreds) 8−3=5 | 14−8=6 | 5−2=3

Watch: 8−3=5 in ones; no borrow in ones place.

16 400 − 163

= 237

Across Zeros 10−3=7 | 9−6=3 | 3−1=2

Watch: 4 becomes 3; tens becomes 9.

7 802 − 349

= 453

Across Zeros 12−9=3 | 9−4=5 | 7−3=4

Watch: 2 becomes 12; tens becomes 9; 8 becomes 7.

17 823 − 375

= 448

Regroup Twice 13−5=8 | 11−7=4 | 7−3=4

Watch: 2 becomes 1; 11−7=4; 8 becomes 7.

8 725 − 458

= 267

Regroup Twice 15−8=7 | 11−5=6 | 6−4=2

Regroup Twice 11−8=3 | 12−6=6 | 4−2=2

Watch: 3 becomes 2, then regroups to 12.

18 900 − 528

= 372

Across Zeros 10−8=2 | 9−2=7 | 8−5=3

Watch: 9 becomes 8; middle 0 becomes 9.

9 602 − 275

= 327

Across Zeros 12−5=7 | 9−7=2 | 5−2=3

Watch: 2 becomes 12; 0 becomes 9; 6 becomes 5.

19 485 − 249

= 236

Regroup Once (Tens) 15−9=6 | 7−4=3 | 4−2=2

Watch: 8 becomes 7; no borrowing needed from 4.

10 518 − 273

= 245

Regroup Once (Hundreds) 8−3=5 | 11−7=4 | 4−2=2

Watch: 8−3 needs no regrouping.

20 743 − 287

= 456

Regroup Twice 13−7=6 | 13−8=5 | 6−2=4

Watch: 4 becomes 3, borrows to 13; 7 becomes 6.

Addition Check: Add the difference to the subtrahend to verify minuend.

Tuesday Master Key

Check

16 #16

−

4 5 3

−

1 8 7

Check

17 #17

−

7 5 8

−

2 9 1

Check

18 #18

−

6 0 0

−

2 8 5

Check

19 #19

−

8 6 4

−

3 9 7

Check

20 #20

−

8 9 2

−

5 6 7

Check

Page 2 of 2 • Problems 11–20

Total Wednesday Score: / 20

Watch: 8 becomes 7; 7−4=3 without hundreds borrowing.

18 600 − 285

= 315

Across Zeros 10−5=5 | 9−8=1 | 5−2=3

Watch: 6 becomes 5; tens becomes 9; ones becomes 10.

9 503 − 168

= 335

Across Zeros 13−8=5 | 9−6=3 | 4−1=3

Watch: 5 becomes 4; middle 0 becomes 9.

19 864 − 397

= 467

Regroup Twice 14−7=7 | 15−9=6 | 7−3=4

Watch: 6 becomes 5, then regroups to 15; 8 becomes 7.

10 615 − 248

= 367

Regroup Twice 15−8=7 | 10−4=6 | 5−2=3

Watch: 1 becomes 0, then regroups to 10; 6 becomes 5.

20 892 − 567

= 325

Regroup Once (Tens) 12−7=5 | 8−6=2 | 8−5=3

Watch: 9 becomes 8; no borrowing needed in hundreds.

Addition Check: Add the difference to the subtrahend to verify minuend.

Wednesday Master Key

Check

16 #16

−

4 0 0

−

1 6 3

Check

17 #17

−

8 2 3

−

3 7 5

Check

18 #18

−

8 1 9

−

3 6 4

Check

19 #19

−

7 6 2

−

2 8 5

Check

20 #20

−

6 7 1

−

3 4 8

Check

Page 2 of 2 • Problems 11–20

Total Thursday Score: / 20

Watch: 2 becomes 1; 11−5=6; 7 becomes 6.

18 819 − 364

= 455

Regroup Once (Hundreds) 9−4=5 | 11−6=5 | 7−3=4

Watch: 9−4=5 in ones; no borrow needed.

9 954 − 628

= 326

Regroup Once (Tens) 14−8=6 | 4−2=2 | 9−6=3

Watch: 5 becomes 4; 4−2=2 without hundreds borrow.

19 762 − 285

= 477

Regroup Twice 12−5=7 | 15−8=7 | 6−2=4

Watch: 6 becomes 5, borrows to 15; 7 becomes 6.

10 600 − 374

= 226

Across Zeros 10−4=6 | 9−7=2 | 5−3=2

Watch: 6 becomes 5; tens becomes 9.

20 671 − 348

= 323

Regroup Once (Tens) 11−8=3 | 6−4=2 | 6−3=3

Watch: 7 becomes 6; no hundreds borrowing needed.

Addition Check: Add the difference to the subtrahend to verify minuend.

Thursday Master Key

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