Regrouping Baseline Pre Test Diagnostic Benchmark Grade 2 / Grade 3 Math
Regrouping Baseline Pre-Test
Addition and subtraction with regrouping up to 3 digits
Student Name __________________
Date __________
Score: ______ / 10 pts
Instructions: Solve each problem vertically. Record all regrouping marks in the top boxes.
1 pt each
1 Add with Regrouping
H T O
3 5 8
Workspace
2 Add with Regrouping
H T O
4 6 7
Workspace
3 Add with Regrouping
H T O
5 2 9
Workspace
4 Add with Regrouping
H T O
6 4 5
Workspace
5 Add with Regrouping
H T O
3 9 6
Workspace
6 Subtract with Regrouping
H T O
7 4 2
- 3 8 5
Workspace
7 Subtract with Regrouping
H T O
6 5 3
- 2 8 9
Workspace
8 Subtract across Zero
H T O
8 0 4
- 3 6 7
Workspace
9 Word Problem
Leo collected 286 autumn leaves. Maya collected 349 leaves. How many leaves did they collect in all?
Equation:
Answer:
leaves
10 Word Problem
The school library had 520 mystery books. Students checked out 278 books. How many mystery books remain?
Equation:
Answer:
books
Self-Check: ✓ Did you check place values? ✓ Did you record all trades/regrouping marks?
Page 1 of 1
Regrouping Pre Test Teacher Guide Teacher Guide & Key Diagnostic Scoring Rubric
Pre-Test Answer Key & Diagnostic Guide
Detailed solutions, regrouping checkpoints, and misconception cues
Total Assessment 10 Problems (10 Pts)
Step-by-Step Solutions 1 point per problem
#1. 358 + 274 Ans: 632
Regroup 12 ones (carry 1 ten). Regroup 13 tens (carry 1 hundred).
#2. 467 + 185 Ans: 652
Regroup 12 ones (carry 1 ten). Regroup 15 tens (carry 1 hundred).
#3. 529 + 348 Ans: 877
Regroup 17 ones (carry 1 ten). Tens: 1+2+4=7 (no regrouping).
#4. 645 + 87 Ans: 732
Place value alignment check! Carry 1 ten, carry 1 hundred: 6+1=7.
#5. 396 + 408 Ans: 804
Regroup 14 ones (carry 1). 1+9+0=10 tens (write 0, carry 1 hundred).
#6. 742 − 385 Ans: 357
Borrow 1 ten (12−5=7). Borrow 1 hundred (13−8=5). Hundreds: 6−3=3.
#7. 653 − 289 Ans: 364
Borrow 1 ten (13−9=4). Borrow 1 hundred (14−8=6). Hundreds: 5−2=3.
#8. 804 − 367 Ans: 437
Across zero: 804 → 7 hundreds, 9 tens, 14 ones. 14−7=7, 9−6=3, 7−3=4.
#9. Leo & Maya (Leaves) Ans: 635 leaves
Equation: 286 + 349 = 635. Award 0.5 pt for accurate equation, 0.5 pt for correct sum and unit.
#10. Library Mystery Books Ans: 242 books
Equation: 520 − 278 = 242. Regroup from tens (0 becomes 10, borrow from 5). Award 0.5 pt for equation, 0.5 pt for answer with unit.
Diagnostic Error Matrix
Reversal Subtraction (#6, #7, #8) Student subtracts top from bottom (e.g., 5 − 2 = 3 instead of borrowing). Remediation: Use base-10 chips to prove "You can't take 5 from 2 without unbundling."
Regrouping Across Zero Error (#8) Student skips the zero or converts zero to 10 without taking from the hundreds column. Remediation: Model 804 as 80 tens and 4 ones → 79 tens and 14 ones.
Place Value Misalignment (#4) Aligning 87 under hundreds/tens instead of tens/ones. Remediation: Enforce vertical grid guidelines and column headers (H, T, O).
Forgotten Add-In (#1, #2, #5) Carrying marks written but forgotten during column addition. Remediation: Highlighting the carried box before adding.
Benchmark Placement Tiers
9–10 Pts: Mastery Tier 1: Extension / 4-digit
7–8 Pts: Approaching Tier 1: Precision practice
5–6 Pts: Developing Tier 2: Guided small group
0–4 Pts: Intervention Tier 3: Base-10 manipulatives
Teacher Resource: Grade 2–3 Regrouping Assessment Suite Answer Key • Page 1 of 1
Regrouping Growth Post Test Growth Assessment Grade 2 / Grade 3 Math
Regrouping Growth Post-Test
Addition and subtraction with regrouping up to 3 digits
Student Name __________________
Date __________
Score: ______ / 10 pts
Instructions: Solve each problem vertically. Record all regrouping marks in the top boxes.
1 pt each
1 Add with Regrouping
H T O
3 6 7
Workspace
2 Add with Regrouping
H T O
4 7 8
Workspace
3 Add with Regrouping
H T O
5 3 8
Workspace
4 Add with Regrouping
H T O
6 5 8
Workspace
5 Add with Regrouping
H T O
2 9 7
Workspace
6 Subtract with Regrouping
H T O
7 5 3
- 3 8 6
Workspace
7 Subtract with Regrouping
H T O
6 4 2
- 2 7 8
Workspace
8 Subtract across Zero
H T O
7 0 5
- 3 4 8
Workspace
9 Word Problem
The community garden harvested 278 red apples and 356 green apples. How many apples were picked in all?
Equation:
Answer:
apples
10 Word Problem
A bakery baked 610 blueberry muffins in the morning. By noon, they had sold 385 muffins. How many muffins are left?
Equation:
Answer:
muffins
Self-Check: ✓ Did you check place values? ✓ Did you record all trades/regrouping marks?
Page 1 of 1
Regrouping Post Test Teacher Guide Teacher Guide & Key Post-Assessment & Growth Tracking
Post-Test Answer Key & Growth Guide
Complete solutions, regrouping verification, and pre-to-post growth analytics
Total Assessment 10 Problems (10 Pts)
Step-by-Step Solutions 1 point per problem
#1. 367 + 285 Ans: 652
Regroup 12 ones (carry 1 ten). Regroup 15 tens (carry 1 hundred).
#2. 478 + 165 Ans: 643
Regroup 13 ones (carry 1 ten). Regroup 14 tens (carry 1 hundred).
#3. 538 + 327 Ans: 865
Regroup 15 ones (carry 1 ten). Tens: 1+3+2=6 (no regrouping).
#4. 658 + 76 Ans: 734
Place value alignment check! Carry 1 ten, carry 1 hundred: 6+1=7.
#5. 297 + 508 Ans: 805
Regroup 15 ones (carry 1). 1+9+0=10 tens (write 0, carry 1 hundred).
#6. 753 − 386 Ans: 367
Borrow 1 ten (13−6=7). Borrow 1 hundred (14−8=6). Hundreds: 6−3=3.
#7. 642 − 278 Ans: 364
Borrow 1 ten (12−8=4). Borrow 1 hundred (13−7=6). Hundreds: 5−2=3.
#8. 705 − 348 Ans: 357
Across zero: 705 → 6 hundreds, 9 tens, 15 ones. 15−8=7, 9−4=5, 6−3=3.
#9. Orchard Harvest (Apples) Ans: 634 apples
Equation: 278 + 356 = 634. Award 0.5 pt for accurate equation, 0.5 pt for correct sum and unit.
#10. Bakery Blueberry Muffins Ans: 225 muffins
Equation: 610 − 385 = 225. Regroup across tens: 0 becomes 10 (borrowed from 1 ten → 0 tens). Regroup 6 hundreds → 5 hundreds, 10 tens. 10−8=2. 5−3=2.
Measuring Pre-to-Post Growth
Growth Metric Formula:
Growth = Post-Score − Pre-Score
Because problem sets 1–10 match item-for-item in cognitive complexity, direct delta scoring accurately isolates skill mastery.
High Growth (+4 to +10 pts) Full conceptual leap. Regrouping is automated. Progress to multi-step word problems and 4-digit mental math.
Moderate Growth (+2 to +3 pts) Algorithm is understood but basic facts or column alignment slips still occur. Provide fluency drills.
Flat / Low Growth (0 to +1 pt) Persistent unaddressed misconception (e.g. subtracting smaller from larger, or zero confusion). Schedule 1-on-1 manipulatives reteach.
Next Steps by Outcome
Score 9–10: Enrichment: Estimation & 4-digit
Score 7–8: Peer tutoring / Word problem sets
Score ≤ 6: Small-group targeted regrouping clinic
Teacher Resource: Grade 2–3 Regrouping Assessment Suite Post-Test Key • Page 1 of 1
Two Digit Growth Post Test 2-Digit Post-Test Grade 2 / Grade 3 Math
2-Digit Regrouping Post-Test
Addition and subtraction with regrouping within 100
Student Name __________________
Date __________
Score: ______ / 10 pts
Instructions: Solve each 2-digit problem vertically. Show your regrouping marks in the Tens (T) and Ones (O) boxes.
1 pt each
1 2-Digit Addition
T O
4 8
Workspace
2 2-Digit Addition
T O
5 6
Workspace
3 2-Digit Addition
T O
2 9
Workspace
4 2-Digit Addition
T O
6 7
Workspace
5 2-Digit Addition
T O
3 5
Workspace
6 2-Digit Subtraction
T O
7 2
- 3 8
Workspace
7 2-Digit Subtraction
T O
8 5
- 4 9
Workspace
8 Subtract with Zero
T O
9 0
- 3 6
Workspace
9 Word Problem
Maya baked 38 chocolate cookies and 47 vanilla cookies for the bake sale. How many cookies did Maya bake altogether?
Equation:
Answer:
cookies
10 Word Problem
A toy shop had 71 puzzle boxes on the shelf. Customers bought 45 puzzle boxes. How many puzzle boxes remain on the shelf?
Equation:
Answer:
puzzles
Check Your Work: ✓ 10 ones = 1 ten (trade when adding) ✓ Unbundle 1 ten = 10 ones (when subtracting)
2-Digit Post-Test • Page 1 of 1
Two Digit Mastery Retest Intervention Retest Grade 2 / Grade 3 Math
2-Digit Regrouping Retest
Post-intervention assessment for addition and subtraction within 100
Student Name __________________
Date __________
Score: ______ / 10 pts
Instructions: Solve each 2-digit problem vertically. Show your regrouping marks in the Tens (T) and Ones (O) boxes.
1 pt each
1 2-Digit Addition
T O
4 7
Workspace
2 2-Digit Addition
T O
5 8
Workspace
3 2-Digit Addition
T O
3 9
Workspace
4 2-Digit Addition
T O
6 8
Workspace
5 2-Digit Addition
T O
4 5
Workspace
6 2-Digit Subtraction
T O
7 3
- 3 9
Workspace
7 2-Digit Subtraction
T O
8 4
- 4 8
Workspace
8 Subtract with Zero
T O
9 0
- 4 6
Workspace
9 Word Problem
Caleb collected 39 red marbles and 46 blue marbles. How many marbles does Caleb have in all?
Equation:
Answer:
marbles
10 Word Problem
The art club had 73 paint brushes. During art class, 48 brushes were used. How many brushes were not used?
Equation:
Answer:
brushes
Check Your Work: ✓ 10 ones = 1 ten (trade when adding) ✓ Unbundle 1 ten = 10 ones (when subtracting)
2-Digit Retest • Page 1 of 1
Two Digit Assessment Teacher Guide Teacher Resource & Key 2-Digit Foundation Level
2-Digit Post-Test & Retest Teacher Guide
Side-by-side answer keys, regrouping cues, and intervention strategies
Standard 2.NBT.B.5 / 3.NBT.A.2
Post-Test Solutions 10 Pts
#1. 48 + 27 (8+7=15; 1+4+2) Ans: 75
#2. 56 + 39 (6+9=15; 1+5+3) Ans: 95
#3. 29 + 45 (9+5=14; 1+2+4) Ans: 74
#4. 67 + 28 (7+8=15; 1+6+2) Ans: 95
#5. 35 + 46 (5+6=11; 1+3+4) Ans: 81
#6. 72 − 38 (12−8=4; 6−3=3) Ans: 34
#7. 85 − 49 (15−9=6; 7−4=3) Ans: 36
#8. 90 − 36 (10−6=4; 8−3=5) Ans: 54
#9. Cookies (Add): 38 + 47 85 cookies
0.5 pt equation, 0.5 pt sum + unit label
#10. Puzzles (Sub): 71 − 45 26 puzzles
0.5 pt equation, 0.5 pt diff + unit label
Retest Solutions 10 Pts
#1. 47 + 28 (7+8=15; 1+4+2) Ans: 75
#2. 58 + 37 (8+7=15; 1+5+3) Ans: 95
#3. 39 + 35 (9+5=14; 1+3+3) Ans: 74
#4. 68 + 27 (8+7=15; 1+6+2) Ans: 95
#5. 45 + 36 (5+6=11; 1+4+3) Ans: 81
#6. 73 − 39 (13−9=4; 6−3=3) Ans: 34
#7. 84 − 48 (14−8=6; 7−4=3) Ans: 36
#8. 90 − 46 (10−6=4; 8−4=4) Ans: 44
#9. Marbles (Add): 39 + 46 85 marbles
0.5 pt equation, 0.5 pt sum + unit label
#10. Brushes (Sub): 73 − 48 25 brushes
0.5 pt equation, 0.5 pt diff + unit label
Diagnostic Intervention Protocol (2-Digit Regrouping)
Addition: Trading 10 Ones
If ones sum ≥ 10, write the ones digit in the ones column and place the carried ten directly in the T box . Remind students to add all 3 numbers in the tens column (carried ten + top ten + bottom ten).
Subtraction: Unbundling 1 Ten
When top ones digit < bottom ones digit, teach students to say: "More on the floor? Go next door and borrow 1 ten!" Cross out the tens digit, decrease it by 1, and add 10 to the ones digit.
Mastery Progression Criteria