Trade Station Lesson Plan CRA Math Routine Grades 2–4 Special Education
Duration: 45–60 Min
Regrouping Trade Station Lesson Plan
Multisensory Subtraction with Regrouping via Concrete-Representational-Abstract (CRA) Sequence
Instructional Objective
Students will physically unbundle and exchange 1 Ten rod for 10 One units at the Trade Bank, record the exchange with visual slash-and-write notation, and compute 2-digit subtraction problems with 80% accuracy over 3 consecutive sessions.
Sample IEP Goal Target
"When presented with two-digit subtraction problems requiring regrouping, [Student] will use tactile base-ten organizers to complete trades and compute differences with 80% accuracy in 4 out of 5 measured trials."
Trade Station Materials & Workspace Setup
Tactile Manipulatives Base-ten rods (Tens) & unit cubes (Ones), or textured foam tokens. Place 10 units in each "Exchange Cup."
Visual Organizers Laminated "Trade Station Activity Mat", two-color dry-erase markers (Red for Trades, Navy for Values).
Multisensory Rhyme Card Visual poster displayed: "More on top? No need to stop! More on the floor? Go next door, trade 1 Ten for 10 more!"
Phase 1: Explicit CRA Modeling ("I Do" — 12 Mins)
Example: 52 − 27
Step 1
Build the Minuend (Top Number): "We build the top number only: 52 has 5 Tens rods and 2 Ones units on our mat. The bottom number (27) is our 'take-away' target."
Step 2
Inspect the Ones & Recite Rhyme: "Look at the Ones column: we have 2 units. We need to subtract 7. Can I take 7 from 2? No! More on the floor? Go next door! "
Step 3
The Bank Trade (Concrete): "I take 1 Ten rod from the Tens house and bring it to the Trade Station Bank. The Bank exchanges it for exactly 10 single units. I add them to my 2 units. How many Ones now? 10 + 2 = 12 Ones!"
Step 4
Recording the Trade (Representational): "Cross out the 5 Tens: write 4 above it. Cross out the 2 Ones: write 12 above it. Our value is still 52 (40 + 12 = 52), but now we have enough Ones!"
Step 5
Subtract Ones, Then Tens (Abstract): "Now take away 7 units from 12: 12 − 7 = 5. Now take away 2 Tens from 4 Tens: 4 − 2 = 2. Difference is 25!"
Regrouping Trade Station • Teacher Instructional Guide Page 1 of 2
Instructional Protocols & Differentiation Station Routine & Progress Monitoring
Guided Station Routine & Intervention Protocols
Phase 2: Partner Trade ("We Do" — 15 Mins)
Assign collaborative roles for active engagement and peer verbal scaffolding:
Role A (The Builder): Places minuend blocks in the place-value frames and verifies physical subtraction.Role B (The Bank Auditor): Audits whether a trade is needed, enforces the 1 Ten = 10 Ones trade rule, and records the slash-notation.Rotate roles after every 2 completed problems.
Concrete-to-Representational Transition
Gradually fade physical manipulatives as students demonstrate mastery:
Level 1 (Concrete): Full block exchange at the physical bank.Level 2 (Representational): Draw place-value sticks (Tens) and dots (Ones), circle 1 Ten stick and arrow it to draw 10 dots.Level 3 (Abstract): Numeric algorithm with color-coded trade boxes.
SPED Misconception Diagnostic Table
Observed Student Error Root Cognitive Cause Immediate Corrective Intervention Smaller-from-Larger Flip (e.g., 52 − 27 = 35) Reverses digits in Ones column (7 − 2 = 5) to avoid regrouping difficulty. Physically block the Tens. Put only 2 cubes down: "Hand me 7 cubes from here. Can you? No, you can't invent cubes!" Vanishing Ten (Takes 10, doesn't decrement) Working memory overload; completes the addition to Ones without subtracting from Tens. Enforce the "Toll Gate": The bank vault will not open until the Ten rod is physically dropped into the exchange chute. Over-Regrouping (Trades when not needed) Mechanical habituation; regroups reflexively on every problem (e.g., 58 − 23). Enforce the "Stop Light Check": Yellow light question: "Do you already have enough ones in your hand?"
Tiered Accommodations for Diverse Learners
Motor & Fine Motor Use magnetic Ten-frames, textured velvet tokens, or unifix snap-cubes that snap apart easily with grip assistance.
Visual & Spatial Processing High-contrast color channels (Tens = Blue, Ones = Amber). Highlight column borders with tactile puffy paint.
Attention & Executive Function Laminated 4-step checklist with self-erasing dry-erase checkboxes to keep track of subtraction phase.
Quick Progress Monitoring Criteria (Scale 1–4)
1: Novice
Subtracts bottom from top; cannot determine trade need.
2: Emerging
Executes trade with physical blocks; needs prompting for notation.
3: Proficient
Independently trades & records slashes accurately; minor calc error.
4: Mastered
Explains place value exchange verbally; solves accurately on paper.
Regrouping Trade Station • Teacher Instructional Guide Page 2 of 2
Trade Station Slides Math Routine
Special Education Concrete-to-Visual
The Fair Trade Bank
Regrouping Trade Station
Master multi-digit subtraction by unlocking the secret of place-value exchanges!
🏛️
The Bank Rule
1 Ten = 10 Ones
🔍
Look at the Ones
Top vs. Floor check
✍️
Slash & Record
Write new values clearly
Rule #1
The Golden Rule of the Bank
Always Fair Trades!
1 Ten Rod
Worth Exactly 10
10 Single Ones
Still Worth 10!
✨ The value is the same! We only change how the number is dressed!
Secret Chant
The Subtraction Rhyme
Always Start in the Ones!
Case 1: More on Top?
"More on top?
You already have enough Ones! Just subtract normally.
7 − 3 = 4 (Easy!)
Case 2: More on the Floor?
"More on the floor?
You don't have enough! Visit the Trade Bank right away!
2 − 7 = Need a Trade!
👉 Point your finger to the Ones column before touching any blocks!
Model
Solving: 43 − 18
Follow the 4 Action Steps
Step 1
Check Ones
3 on top, 8 on the floor. 8 is bigger!
Need a Trade!
Step 2
Trade at Bank
Take 1 Ten rod. Get 10 single ones.
3 + 10 = 13 Ones!
Step 3
Slash & Record
Cross out 4, write 3. Cross 3, write 13.
3 Tens & 13 Ones
Step 4
Subtract!
13 − 8 = 5 Ones.
Total = 25 🎉
💡 Notice: 3 Tens + 13 Ones is still 43! Nothing was lost!
Quick Quiz
Trade or No Trade?
Show Your Signal!
Problem A
65 − 23
Look at the Ones: 5 on top, 3 on the floor.
NO TRADE! (More on top)
Problem B
52 − 38
Look at the Ones: 2 on top, 8 on the floor.
TRADE! (Go next door)
Thumbs UP for Trade 👍 • Thumbs DOWN for No Trade 👎
Trade Station Activity Mat Station Mat
Regrouping Trade Station Organizer
The Fair Trade Bank: 1 Ten = 10 Ones
Name:
Date:
1 Build Minuend (Top #)
2 Check Ones: Need Trade?
3 Bank Trade: 1 Ten ➔ 10 Ones
4 Subtract Ones, Then Tens
Tens Zone
Rods (10s)
10
10
10
10
10
Place your starting Tens rods here
Trade Bank
Drop 1 Ten Rod Here
Exchange Vault
1 Ten Rod
Take 10 Ones to Right
Ones Zone
Units (1s)
Original Ones Frame: Max 10
1
2
3
4
5
6
7
8
9
10
Traded Ones Frame (+10 From Bank): Traded
+1
+2
+3
+4
+5
+6
+7
+8
+9
+10
Fill Frame 1 first, then add 10 traded units in Frame 2!
Dry-Erase Algorithm
Record your slash trades and subtract below.
Rhyme: More on floor? Go next door!
Tens
−
Ones
Final Difference
Station Tokens & Challenge Cards
Cut, laminate, and place into the station supply caddy.
✂️ Scissors / Laminate Prep
Official
Station Lead Banker
Audits the 1 Ten = 10 Ones trade at the bank chute. Ensures no extra blocks are taken!
Official
Station Lead Scribe
Records the slash notation and writes the new regrouped values in the top boxes.
Printable Place-Value Tokens Cut along dotted lines for emergency manipulatives
10
10
10
10
10
10
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
Trade Station Practice Worksheet Practice Sheet Regrouping Trade Station
Name:
Date:
Subtraction with Regrouping: Trade Practice
🏛️
The Trade Rule: 1 Ten Rod exchanges for 10 One Units!
Rhyme: More on the floor? Go next door!
1 Warm-Up: Check the Ones! Circle "Trade" or "No Trade"
Do not solve yet—just inspect the Ones column!
Problem A Ones: 7 vs 3
57 − 23
Trade
No Trade
Problem B Ones: 2 vs 8
42 − 18
Trade
No Trade
Problem C Ones: 4 vs 9
64 − 39
Trade
No Trade
2 Model & Solve: Cross Out, Trade, and Subtract
Step Model: 43 − 16 Cross out 1 Ten rod ➔ Draw 10 Ones
Tens (4)
✕
➔
Ones (3 + 10 = 13)
Now cross out 1 Ten and 6 Ones to find what remains!
Standard Algorithm
4 3
1 6
Step Model: 52 − 27 Cross out 1 Ten rod ➔ Draw 10 Ones
Tens (5)
✕
➔
Ones (2 + 10 = 12)
Cross out 2 Tens and 7 Ones to solve!
Standard Algorithm
5 2
2 7
Regrouping Trade Station Practice Page 1 of 2
Independent Trade Practice
Slash & Record Carefully
Remember to check the Ones first: if there is more on the floor, trade 1 Ten for 10 Ones!
Problem 1: 61 − 25 Tens | Ones
6 1
− 2 5
Check: 1 − 5? Need trade! 61 becomes 50 + 11.
Problem 2: 74 − 38 Tens | Ones
7 4
− 3 8
Check: 4 − 8? Need trade! 74 becomes 60 + 14.
Problem 3: 83 − 47 Tens | Ones
8 3
− 4 7
Check: 3 − 7? Need trade! 83 becomes 70 + 13.
Problem 4: 50 − 19 ⭐ Zero Alert Tens | Ones
5 0
− 1 9
Check: 0 − 9? 0 Ones! Trade 1 Ten for 10 Ones (0 + 10 = 10).
Part 4: Story Problem Organizer Real-World Math
Marcus collected 45 stickers in his album. He gave 18 stickers to his younger sister. How many stickers does Marcus have left?
Step 1: Set Up Equation
Total minus given
Step 2: Check Ones
More on Top
