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Regrouping Masters • Sequence • Lenny.com

Math Numbers & Counting Counting Objects Number Names Comparing Numbers Number Operations Counting Sequence Numbers 0-10 Place Value Understanding and System Add and Subtract Within 20 Addition and Subtraction Concepts Addition and Subtraction Equations Addition and Subtraction Problems Foundations for Multiplication Multiplication and Division Properties Multiply and Divide Within 100 Multiplication and Division Problems Factors and Multiples Properties of Operations Patterns and Relationships Generate and Analyze Patterns Multi-Digit Arithmetic Place Value Operations Multi-Digit and Decimal Operations Numerical Expressions Four Operations and Patterns Four Operations Problem Solving Measurement & Data Measurable Attributes Measuring Lengths Measure and Estimate Lengths in Standard Units Relate Addition and Subtraction to Length Classifying and Counting Objects Time and Money Area Concepts and Measurement Perimeter and Area Measures Angle Concepts and Measurement Time, Volume, and Mass Measurement Unit Conversions Geometry Identifying Shapes Shapes and Attributes Shape Attributes and Reasoning Shapes and Composition Classifying 2D Figures Geometric Figures and Relationships Lines, Angles, and Shapes Angle, Area, and Volume Geometric Measurement Volume of 3D Shapes Coordinate Plane Applications Transformations in the Plane Congruence and Similarity Understand congruence in terms of rigid motions Similarity and Transformations Prove Theorems Involving Similarity Pythagorean Theorem Trigonometry for General Triangles Make Geometric Constructions Prove Geometric Theorems Theorems About Circles Find Arc Lengths And Areas of Sectors of Circles Volume Formulas Relationships Between Two-Dimensional and Three-Dimensional Objects Prove Simple Geometric Theorems Algebraically Translate Between Geometric Description and Equation for Conic Section Apply Geometric Concepts in Modeling Situations Fractions & Decimals Fractions as Numbers Building Fractions Fraction Equivalence and Ordering Adding and Subtracting Fractions Multiplying and Dividing Fractions Dividing Fractions Decimal Fractions Multi-Digit Computation and Factors Add, Subtract, Multiply, and Divide Rational Numbers Rational Number System Irrational Numbers and Approximations Ratios Ratios and Proportions Proportional Relationships Unit Rate Algebra Algebraic Expressions Generate Equivalent Expressions Quantitative Relationships Proportional Relationships and Linear Equations Equations and Inequalities Equation Solving and Reasoning Linear Equations and Systems Graph Equations and Inequalities Systems of Equations Real-World Algebraic Problems Quantitative Reasoning with Units Expression Structure Equivalent Expression Forms Radicals and Integer Exponents Rational Exponents Rational and Irrational Numbers Polynomial Operations Polynomial Identities Polynomial Zeros and Factors Rational Expressions Complex Number Operations Complex Numbers in Polynomials Complex Numbers on Plane Statistics & Probability Represent and Interpret Data Data Distributions Statistical Variability Probability Models Compound Event Probabilities Statistical Sampling Interpret Categorical and Quantitative Data Bivariate Data Patterns Interpret Linear Models Comparing Two Populations Random Processes in Statistics Independence and Conditional Probability Expected Values Probability-Based Decision Making Statistical Inference and Conclusions Functions Function Concepts and Notation Define and Compare Functions Interpret Functions in Context Analyze Function Representations Model Relationships with Functions Identify Linear vs Exponential Growth Distinguish Between Function Types Compare Growth Rates Interpret Function Expressions Build Functions from Relationships Construct and Model Functions Transform and Combine Functions Model Comparison and Selection Solve Exponential Equations Trigonometry Trigonometric Ratios Involving Right Triangles Trigonometric Functions and Unit Circle Model with Trigonometric Functions Trigonometric Identities Vectors & Matrices Introduction to Vectors and Matrices Vector Quantities Vector Operations Matrix Operations Calculus Limits and Continuity Derivative Concepts and Notation Derivative Rules and Techniques Applications of Derivatives Optimization Problems Related Rates Curve Sketching and Analysis Integration Concepts and Notation Antiderivatives and Indefinite Integrals Definite Integrals and Area Fundamental Theorem of Calculus Integration Techniques Applications of Integration Differential Equations Sequences and Series Parametric and Polar Functions Vector-Valued Functions

Regrouping Masters

A three-day intervention sequence focusing on 3-digit subtraction with standard algorithm regrouping. Tailored for resource math groups with place-value alignment grids and reduced visual load across single borrowing, double borrowing, and borrowing across zeroes.

Monday Subtraction Sprint

Monday resource math session featuring 20 targeted 3-digit subtraction problems. Structured with place-value grids and reduced visual clutter balancing single regrouping, double regrouping, and borrowing across zeroes.

Wednesday Subtraction Workout

Wednesday resource math session providing 20 fresh 3-digit subtraction problems. Continues standard algorithm fluency with clear column guides across single, double, and zero regrouping.

Thursday Subtraction Mastery

Thursday resource math session offering 20 cumulative 3-digit subtraction problems. Solidifies mastery and confidence with clear place-value alignment and balanced problem types.

Regrouping Masters

A three-day intervention sequence focusing on 3-digit subtraction with standard algorithm regrouping. Tailored for resource math groups with place-value alignment grids and reduced visual load across single borrowing, double borrowing, and borrowing across zeroes.

Monday Subtraction Worksheet

Monday

3-Digit Subtraction Sprint

Name: Date:

Align place values: Hundreds (H), Tens (T), and Ones (O). Use the top boxes when regrouping.

Part 1 (Problems 1–10)

1

HTO

574

− 238

2

HTO

642

− 275

3

HTO

504

− 237

4

HTO

862

− 427

5

HTO

735

− 388

6

HTO

700

− 348

7

HTO

648

− 382

8

HTO

524

− 169

9

HTO

602

− 185

10

HTO

753

− 329

Resource Math • Algorithm Subtraction Page 1 of 2 (Turn over for 11–20)

Monday

3-Digit Subtraction Sprint (Cont.)

Part 2 (Problems 11–20)

Check each step carefully: Ones first, then Tens, then Hundreds.

Keep digits aligned inside columns

11

HTO

853

− 476

12

HTO

805

− 469

13

HTO

937

− 471

14

HTO

914

− 548

15

HTO

900

− 523

16

HTO

481

− 156

17

HTO

431

− 257

18

HTO

403

− 176

19

HTO

825

− 563

20

HTO

615

− 289

Self-Check: Subtracted ones first Regrouped carefully

Page 2 of 2

Monday Subtraction Answer Key

Teacher Key

Monday 3-Digit Subtraction Sprint

Complete Solutions & Regrouping Steps

Regrouping values shown above digits. Check student column alignment and borrowing pathways.

Part 1 (Problems 1–10)

1 Borrow Once (O)

HTO

6

14

574

− 238

336

2 Borrow Both

HTO

5

13

12

642

− 275

367

3 Across Zero

HTO

4

9

14

504

− 237

267

4 Borrow Once (O)

HTO

5

12

862

− 427

435

5 Borrow Both

HTO

6

12

15

735

− 388

347

6 Across Zero

HTO

6

9

10

700

− 348

352

7 Borrow Once (T)

HTO

5

14

648

− 382

266

8 Borrow Both

HTO

4

11

14

524

− 169

355

9 Across Zero

HTO

5

9

12

602

− 185

417

10 Borrow Once (O)

HTO

4

13

753

− 329

424

Teacher Key • Monday Sprint Page 1 of 2

Teacher Key

Monday 3-Digit Subtraction Sprint (Cont.)

Part 2 (Problems 11–20)

Full regrouping markings & answers for quick diagnostic feedback.

Check place-value column fidelity

11 Borrow Both

HTO

7

14

13

853

− 476

377

12 Across Zero

HTO

7

9

15

805

− 469

336

13 Borrow Once (T)

HTO

8

13

937

− 471

466

14 Borrow Both

HTO

8

10

14

914

− 548

366

15 Across Zero

HTO

8

9

10

900

− 523

377

16 Borrow Once (O)

HTO

7

11

481

− 156

325

17 Borrow Both

HTO

3

12

11

431

− 257

174

18 Across Zero

HTO

3

9

13

403

− 176

227

19 Borrow Once (T)

HTO

7

12

825

− 563

262

20 Borrow Both

HTO

5

10

15

615

− 289

326

Classification Summary: 7 Borrow Once • 7 Borrow Both • 6 Borrow Across Zero

Page 2 of 2

Wednesday Subtraction Worksheet

Wednesday

3-Digit Subtraction Workout

Name: Date:

Keep numbers aligned in Hundreds (H), Tens (T), and Ones (O) columns.

Part 1 (Problems 1–10)

1

HTO

673

− 248

2

HTO

743

− 268

3

HTO

605

− 248

4

HTO

754

− 319

5

HTO

825

− 379

6

HTO

800

− 453

7

HTO

849

− 582

8

HTO

634

− 187

9

HTO

501

− 176

10

HTO

582

− 237

Resource Math • Algorithm Subtraction Page 1 of 2 (Turn over for 11–20)

Wednesday

3-Digit Subtraction Workout (Cont.)

Part 2 (Problems 11–20)

Take your time on zeroes: borrow from hundreds first to give 10 to tens.

Keep digits aligned inside columns

11

HTO

952

− 486

12

HTO

704

− 368

13

HTO

928

− 461

14

HTO

513

− 258

15

HTO

900

− 364

16

HTO

491

− 265

17

HTO

426

− 179

18

HTO

402

− 187

19

HTO

736

− 492

20

HTO

841

− 395

Self-Check: Subtracted ones first Regrouped carefully

Page 2 of 2

Wednesday Subtraction Answer Key

Teacher Key

Wednesday 3-Digit Subtraction Workout

Complete Solutions & Regrouping Steps

Regrouping values shown above digits. Check student column alignment and borrowing pathways.

Part 1 (Problems 1–10)

1 Borrow Once (O)

HTO

6

13

673

− 248

425

2 Borrow Both

HTO

6

13

13

743

− 268

475

3 Across Zero

HTO

5

9

15

605

− 248

357

4 Borrow Once (O)

HTO

4

14

754

− 319

435

5 Borrow Both

HTO

7

11

15

825

− 379

446

6 Across Zero

HTO

7

9

10

800

− 453

347

7 Borrow Once (T)

HTO

7

14

849

− 582

267

8 Borrow Both

HTO

5

12

14

634

− 187

447

9 Across Zero

HTO

4

9

11

501

− 176

325

10 Borrow Once (O)

HTO

7

12

572

− 237

345

Teacher Key • Wednesday Workout Page 1 of 2

Teacher Key

Wednesday 3-Digit Subtraction Workout (Cont.)

Part 2 (Problems 11–20)

Full regrouping markings & answers for quick diagnostic feedback.

Check place-value column fidelity

11 Borrow Both

HTO

8

14

12

952

− 486

466

12 Across Zero

HTO

6

9

14

Thursday Subtraction Worksheet

Thursday

3-Digit Subtraction Mastery

Name: Date:

Show your regrouping neatly in the top boxes: Hundreds (H), Tens (T), and Ones (O).

Part 1 (Problems 1–10)

1

HTO

763

− 328

2

HTO

652

− 278

3

HTO

603

− 275

4

HTO

871

− 436

5

HTO

741

− 385

6

HTO

900

− 468

7

HTO

958

− 384

8

HTO

836

− 459

9

HTO

506

− 189

10

HTO

692

− 257

Resource Math • Algorithm Subtraction Page 1 of 2 (Turn over for 11–20)

Thursday

3-Digit Subtraction Mastery (Cont.)

Part 2 (Problems 11–20)

Stay focused: compute column by column, right to left.

Keep digits aligned inside columns

11

HTO

923

− 567

12

HTO

802

− 347

13

HTO

839

− 571

14

HTO

535

− 288

15

HTO

700

− 283

16

HTO

584

− 149

17

HTO

412

− 165

18

HTO

405

− 168

19

HTO

627

− 381

20

HTO

724

− 369

Self-Check: Subtracted ones first Regrouped carefully

Page 2 of 2

Thursday Subtraction Answer Key

Teacher Key

Thursday 3-Digit Subtraction Mastery

Complete Solutions & Regrouping Steps

Regrouping values shown above digits. Check student column alignment and borrowing pathways.

Part 1 (Problems 1–10)

1 Borrow Once (O)

HTO

5

13

763

− 328

435

2 Borrow Both

HTO

5

14

12

652

− 278

374

3 Across Zero

HTO

5

9

13

603

− 275

328

4 Borrow Once (O)

HTO

6

11

871

− 436

435

5 Borrow Both

HTO

6

13

11

741

− 385

356

6 Across Zero

HTO

8

9

10

900

− 468

432

7 Borrow Once (T)

HTO

8

15

958

− 384

574

8 Borrow Both

HTO

7

12

16

836

− 459

377

9 Across Zero

HTO

4

9

16

506

− 189

317

10 Borrow Once (O)

HTO

8

12

692

− 257

435

Teacher Key • Thursday Mastery Page 1 of 2

Teacher Key

Thursday 3-Digit Subtraction Mastery (Cont.)

Part 2 (Problems 11–20)

Full regrouping markings & answers for quick diagnostic feedback.

Check place-value column fidelity

11 Borrow Both

HTO

8

11

13

923

− 567

356

12 Across Zero

HTO

7

9

12

704

− 368

336

13 Borrow Once (T)

HTO

8

12

928

− 461

467

14 Borrow Both

HTO

4

10

13

513

− 258

255

15 Across Zero

HTO

8

9

10

900

− 364

536

16 Borrow Once (O)

HTO

8

11

491

− 265

226

17 Borrow Both

HTO

3

11

16

426

− 179

247

18 Across Zero

HTO

3

9

12

402

− 187

215

19 Borrow Once (T)

HTO

6

13

736

− 492

244

20 Borrow Both

HTO

7

13

11

841

− 395

446

Classification Summary: 7 Borrow Once • 7 Borrow Both • 6 Borrow Across Zero

Page 2 of 2

802

− 347

455

13 Borrow Once (T)

HTO

7

13

839

− 571

268

14 Borrow Both

HTO

4

12

15

535

− 288

247

15 Across Zero

HTO

6

9

10

700

− 283

417

16 Borrow Once (O)

HTO

7

14

584

− 149

435

17 Borrow Both

HTO

3

10

12

412

− 165

247

18 Across Zero

HTO

3

9

15

405

− 168

237

19 Borrow Once (T)

HTO

5

12

627

− 381

246

20 Borrow Both

HTO

6

11

14

724

− 369

355

Classification Summary: 7 Borrow Once • 7 Borrow Both • 6 Borrow Across Zero

Page 2 of 2

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