A comprehensive 4-lesson sequence focused on mastering 3-digit subtraction, starting from standard alignment without regrouping to complex borrowing across zeros and mixed multi-digit addition/subtraction review.
Check that digits 4, 3, 3 are written cleanly in grid workspace boxes.
Problem 11: Navigator's Mistake Explanation Key
"The navigator subtracted 41 from 573 but aligned 41 under the hundreds and tens place instead of the tens and ones place (treating 41 as 410). They calculated 573 - 410 instead of 573 - 41."
Exit Ticket Key
Problem 1: 563 - 212 351
Problem 2: 784 - 431 353
Problem 3: 965 - 504 461
Homework Key
Problem 1: 485 - 253 232
Problem 2: 769 - 530 239
Unit: Subtraction Superstars Page 2 of 2
Tens (T)
Ones (O)
HTO
-
Unit: Subtraction Superstars Page 5 of 10
Subtraction Superstars — Lesson 2
Independent Practice
Practice — Page 4
PROBLEM 9 Subtract: 762 - 345
Hundreds (H)
Tens (T)
Ones (O)
HTO
-
PROBLEM 10 Subtract: 581 - 246
Hundreds (H)
Tens (T)
Ones (O)
HTO
-
Unit: Subtraction Superstars Page 6 of 10
Subtraction Superstars — Lesson 2
Independent Practice
Practice — Page 5
PROBLEM 11 Subtract: 954 - 438
Hundreds (H)
Tens (T)
Ones (O)
HTO
-
PROBLEM 12 Subtract: 683 - 247
Hundreds (H)
Tens (T)
Ones (O)
HTO
-
Unit: Subtraction Superstars Page 7 of 10
Subtraction Superstars — Lesson 2
Independent Practice
Practice — Page 6
PROBLEM 13 Subtract: 492 - 165
Hundreds (H)
Tens (T)
Ones (O)
HTO
-
PROBLEM 14 Subtract: 873 - 356
Hundreds (H)
Tens (T)
Ones (O)
HTO
-
Unit: Subtraction Superstars Page 8 of 10
Subtraction Superstars — Lesson 2
Star Commander Challenges
Word Problems
PROBLEM 15: COIN SHOWDOWN
At the galactic trading post, Captain Orion had 362 space coins. He bought a light speed engine repair kit for 135 space coins. How many space coins does Orion have left?
Show Your Work / Draw Disks
HTO
-
PROBLEM 16: MUFFIN COUNTER
The station chef baked 454 space muffins. Hungry travelers ordered 228 space muffins for breakfast. How many muffins are remaining?
Show Your Work / Draw Disks
HTO
-
Unit: Subtraction Superstars Page 9 of 10
Subtraction Superstars — Lesson 2
Astro-Navigator Mindset
Reasoning Challenge
CHALLENGE 17: EXPLAIN THE ALGORITHM
If you are subtracting 2-digit numbers from 3-digit numbers (like 582 - 47), does the unbundling rule change? Explain why trading 1 ten for 10 ones works exactly the same way.
Write your complete math proof here...
CHALLENGE 18: CUSTOM UNBUNDLER
Create your own subtraction problem that requires unbundling 1 ten into 10 ones. Draw your model and solve below!
H
T
O
HTO
-
Unit: Subtraction Superstars Page 10 of 10
454 - 228 = 226 Muffins
Check for correct regrouping: Tens=4, Ones=14.
Part B: Challenge Key Concept
"Yes, the regrouping rule is identical. No matter how many hundreds are in the top number, if there are not enough ones, we must unbundle 1 ten. Place value properties are consistent regardless of the number of digits in the hundreds place."
Exit Ticket Key
Problem 1: 342 - 128 214
Problem 2: 583 - 246 337
Problem 3: 761 - 425 336
Homework Key
Problem 1: 462 - 138 324
Problem 2: 654 - 329 325
Unit: Subtraction Superstars Page 2 of 2
Ones (O)
HTO
-
Unit: Subtraction Superstars Page 5 of 10
Subtraction Superstars — Lesson 3
Independent Practice
Practice — Page 4
PROBLEM 9 Subtract: 600 - 243
Hundreds (H)
Tens (T)
Ones (O)
HTO
-
PROBLEM 10 Subtract: 802 - 357
Hundreds (H)
Tens (T)
Ones (O)
HTO
-
Unit: Subtraction Superstars Page 6 of 10
Subtraction Superstars — Lesson 3
Independent Practice
Practice — Page 5
PROBLEM 11 Subtract: 400 - 138
Hundreds (H)
Tens (T)
Ones (O)
HTO
-
PROBLEM 12 Subtract: 903 - 465
Hundreds (H)
Tens (T)
Ones (O)
HTO
-
Unit: Subtraction Superstars Page 5 of 10
Subtraction Superstars — Lesson 3
Independent Practice
Practice — Page 6
PROBLEM 13 Subtract: 502 - 274
Hundreds (H)
Tens (T)
Ones (O)
HTO
-
PROBLEM 14 Subtract: 700 - 328
Hundreds (H)
Tens (T)
Ones (O)
HTO
-
Unit: Subtraction Superstars Page 8 of 10
Subtraction Superstars — Lesson 3
Star Commander Challenges
Word Problems
PROBLEM 15: COIN PICTURES
Mission command has 506 satellite pictures to process. So far, they have analyzed 238 pictures. How many pictures are left?
Show Your Work / Draw Disks
HTO
-
PROBLEM 16: PLANET ROVER
A rover traveled 700 meters on Mars. It completed 459 meters in rocky terrain, and the rest on smooth plains. How many meters did it travel on smooth plains?
Show Your Work / Draw Disks
HTO
-
Unit: Subtraction Superstars Page 9 of 10
Subtraction Superstars — Lesson 3
Deep Space Debugger
Navigator's Bug
CHALLENGE 17: EXPLAIN THE ZERO SLIP-UP
An Astro-Navigator solved 603 - 25 but wrote:
The Broken Code
HTO
6
0
3
-
2
5
6
0
2
What went wrong?
Analyze the zero subtraction step. Explain why the pilot got 602 instead of the correct difference.
Write your reasoning here...
CHALLENGE 18: MISSION PLANNER
Create your own subtraction problem! Choose a 3-digit minuend that has a zero in the tens place. Align and solve.
H
T
O
HTO
-
Unit: Subtraction Superstars Page 10 of 10
Problem 7 Answer
506 - 238 = 268 Pictures
Check for correct regrouping: H=4, T=9, O=16.
Problem 8 Answer
700 - 459 = 241 Meters
Check for correct regrouping: H=6, T=9, O=10.
Part B: Mistake Analysis Key
"The pilot did not borrow or trade at all. They subtracted upside down in the ones place (5 - 3 = 2), subtracted nothing in the tens (leaving 0), and subtracted nothing from the hundreds (leaving 6), calculating 603 - 25 = 602 instead of 578."
Exit Ticket Key
Problem 1: 403 - 215 188
Problem 2: 500 - 163 337
Problem 3: 702 - 345 357
Homework Key
Problem 1: 602 - 345 257
Problem 2: 800 - 453 347
Unit: Subtraction Superstars Page 2 of 2
Hundreds (H)
Tens (T)
Ones (O)
HTO
Unit: Subtraction Superstars Page 5 of 10
Subtraction Superstars — Lesson 4
Independent Practice
Practice — Page 4
PROBLEM 9 (SUBTRACTION) Subtract: 402 - 128
Hundreds (H)
Tens (T)
Ones (O)
HTO
-
PROBLEM 10 (ADDITION) Add: 567 + 278
Hundreds (H)
Tens (T)
Ones (O)
HTO
Unit: Subtraction Superstars Page 6 of 10
Subtraction Superstars — Lesson 4
Independent Practice
Practice — Page 5
PROBLEM 11 (SUBTRACTION) Subtract: 900 - 456
Hundreds (H)
Tens (T)
Ones (O)
HTO
-
PROBLEM 12 (ADDITION) Add: 683 + 179
Hundreds (H)
Tens (T)
Ones (O)
HTO
Unit: Subtraction Superstars Page 7 of 10
Subtraction Superstars — Lesson 4
Independent Practice
Practice — Page 6
PROBLEM 13 (SUBTRACTION) Subtract: 501 - 234
Hundreds (H)
Tens (T)
Ones (O)
HTO
-
PROBLEM 14 (ADDITION) Add: 495 + 288
Hundreds (H)
Tens (T)
Ones (O)
HTO
Unit: Subtraction Superstars Page 8 of 10
Subtraction Superstars — Lesson 4
Star Commander Challenges
Word Problems
PROBLEM 15: FLIGHT DURATION SHOWDOWN
Captain Nova logged 384 spaceship flight hours. Commander Lyra logged 247 spaceship flight hours. What is the total number of flight hours logged?
Show Your Work / Draw Disks
HTO
PROBLEM 16: SHIELD LOSS
Starbase Alpha started with 800 emergency defense shield units. After a space meteor storm, they had 356 defense units left. How many shield units were lost?
Show Your Work / Draw Disks
HTO
-
Unit: Subtraction Superstars Page 9 of 10
Subtraction Superstars — Lesson 4
Astro-Navigator Mindset
Reasoning Challenge
CHALLENGE 17: PROCEDURAL BLINDNESS BUG
Explain what procedural blindness is. Why is it critically important to circle and identify the operation sign (+) or (-) in a mixed-operation test BEFORE you begin writing digits or borrowing?
Write your complete math proof here...
CHALLENGE 18: CUSTOM MIXED SHOWDOWN
Create two of your own mixed multi-digit review problems! Write one addition (+) and one subtraction (-) problem, and align and solve below.
