Problem 3: Chimp Bananas 434 → [O]

Part 1: Bananas Left After Monday (−)

500 − 246 = 254 pounds

Part 2: Add Tuesday Delivery (+)

254 + 180 = 434 pounds

Final Answer: 434 pounds

Problem 4: Aquarium Visitors 485 → [W]

Part 1: Visitors Left Behind (−)

702 − 385 = 317 visitors

Part 2: Add New Visitors Entering (+)

317 + 168 = 485 visitors

Final Answer: 485 visitors

Riddle Decoder Key

336=[S] 434=[O] 485=[W] 634=[N]

Punchline: "SNOW!"

Students write S (Prob 1), N (Prob 2), O (Prob 3), and W (Prob 4).

Day 2 Instructional Tips

• Across Zeros in Prob 3 & 4: Remind students that 500 can be thought of as 50 tens -> unpack 1 ten leaves 49 tens and 10 ones.
• Checking Work: Encourage students to check their subtraction by adding the answer back to the subtracted number!

Regrouping Masters • Facilitator Guide Page 2 of 3

Teacher Key

Day 3: Word Problem Solutions

Bakery & Community Theme • Complete Worked Steps & Riddle Key

Grade 3 Regrouping

Problem 1: Bakery Cookies 232 → [F]

700 baked − 468 sold

  [6] [9] [10]

   7  0  0

−  4  6  8

   2  3  2

Answer: 232 cookies

Direct subtraction across two zeros (700 -> 690 + 10).

Problem 2: Community Garden Seeds 665 → [R]

386 sunflower + 279 pumpkin

  [1] [1]

   3 8 6

+  2 7 9

   6 6 5

Answer: 665 seeds

Double carry: 6+9=15 (carry 1); 1+8+7=16 (carry 1); 1+3+2=6.

Problem 3: Apple Harvest 480 → [O]

Part 1: Apples Left After Market (−)

620 − 285 = 335 apples

Part 2: Add Afternoon Picked Batch (+)

335 + 145 = 480 apples

Final Answer: 480 apples

Problem 4: Raffle Ticket Goal 167 → [G]

Part 1: Tickets Sold Thu & Fri (+)

347 + 286 = 633 tickets

Part 2: Difference from 800 Goal (−)

800 − 633 = 167 tickets needed

Final Answer: 167 tickets

Riddle Decoder Key

167=[G] 232=[F] 480=[O] 665=[R]

Punchline: "A FROG!"

Students write F (Prob 1), R (Prob 2), O (Prob 3), and G (Prob 4).

Word Problem Mastery Rubric

• 3 (Exemplary): Accurate vertical regrouping and correct answers with units on all 4 problems.
• 2 (Proficient): Sets up correct operations; minor computation slip in regrouping.
• 1 (Emerging): Reverses digits in subtraction or misidentifies addition/subtraction.

Regrouping Masters • Facilitator Guide Page 3 of 3

700

− 346

Claim

Box 4 −

832

− 475

Claim

Box 5 ★ −

605

− 268

Claim

Box 6 −

714

− 358

Claim

Box 7 ★ −

500

− 237

Claim

Box 8 −

921

− 465

Claim

Box 9 −

624

− 387

Claim

Box 10 ★ −

800

− 453

Claim

Box 11 −

732

− 286

Claim

Box 12 ★ −

904

− 538

Claim

Box 13 −

651

− 287

Claim

Box 14 ★ −

700

− 426

Claim

Box 15 −

815

− 369

Claim

Box 16 ★ −

900

− 462

Claim

Verification Key: 1:346 • 2:356 • 3:354 • 4:357 • 5:337 • 6:356 • 7:263 • 8:456 9:237 • 10:347 • 11:446 • 12:366 • 13:364 • 14:274 • 15:446 • 16:438

Board 2 of 3 • Subtraction Showdown Grade 3 Regrouping Game (★ = Across Zero) Page 2

Board 3

Championship Showdown

Mixed 3-Digit Addition & Subtraction • Ultimate Partner Showdown

Player 1 (O):

Player 2 (X):

Rules: 1. Choose any unsolved box (watch the + or − sign!). 2. Solve it on scratch paper. 3. Claim it with O or X. Connect 4 in a row to win!

Box 1 +

378

+ 285

Claim

Box 2 −

520

− 367

Claim

Box 3 +

456

+ 378

Claim

Box 4 −

700

− 468

Claim

Box 5 −

614

− 278

Claim

Box 6 +

289

+ 345

Claim

Box 7 −

803

− 457

Claim

Box 8 +

386

+ 279

Claim

Box 9 +

467

+ 358

Claim

Box 10 −

715

− 348

Claim

Box 11 +

548

+ 276

Claim

Box 12 −

604

− 279

Claim

Box 13 −

823

− 467

Claim

Box 14 +

395

+ 428

Claim

Box 15 −

900

− 534

Claim

Box 16 +

476

+ 389

Claim

Verification Key: 1:663 • 2:153 • 3:834 • 4:232 • 5:336 • 6:634 • 7:346 • 8:665 9:825 • 10:367 • 11:824 • 12:325 • 13:356 • 14:823 • 15:366 • 16:865

Board 3 of 3 • Championship Showdown Grade 3 Regrouping Game (Mixed Operations) Page 3