Number Lab Cover Page Safe Version Final Lab Protocol NL-2026
Official Lab Record
NUMBER
LAB
MASTERY
Unit Assessment
Lead Scientist
Lab Date
Station ID
Mental Math Scaffolds 1 (Light) Mental Math Strategies
Module 01: Adding & Subtracting 10
Scientist: ______________________
Lab Date: _______________________
Lab Observation: The Tens Digit
When we add or subtract 10 , only the digit in the Tens Place changes. The Hundreds and Ones stay the same!
Original
2
4
5
+ 10 →
New Result
2
5
5
01. 326 + 10 =
3
2
6
3
6
02. 581 + 10 =
5
8
1
5
1
03. 472 - 10 =
4
7
2
4
2
Lab Challenge
Start with 248 . Add 10, then add 10 again.
________
Mental Math Scaffolds 2 (Light) Mental Math Strategies
Module 01: Adding & Subtracting 100
Scientist: ______________________
Lab Date: _______________________
Lab Observation: The Hundreds Digit
When we add or subtract 100 , only the digit in the Hundreds Place changes. The Tens and Ones stay exactly the same!
Original
3
5
9
+ 100 →
New Result
4
5
9
01. 247 + 100 =
2
4
7
4
7
02. 613 + 100 =
6
1
3
1
3
03. 895 - 100 =
8
9
5
9
5
Lab Challenge
Start with 125 . Add 100, then subtract 10.
________
Mental Math Mastery Worksheet (Light) Mental Math Mastery
Final Lab Protocol: Skills Assessment
Scientist: ______________________
Lab Date: _______________________
Think: Which digit changes? (+/- 10 = Tens place | +/- 100 = Hundreds place)
Observation 01 452 + 10 =
____
Observation 02 831 - 100 =
____
Observation 03 605 + 100 =
____
Observation 04 279 - 10 =
____
Observation 05 148 + 100 =
____
Observation 06 593 - 10 =
____
?
Status Report
How many points did you earn today?
/ 6
Comparison Lab Scaffolds 1 (Light) Comparison Lab
Module 02: Comparing 3-Digit Numbers
Scientist: ______________________
Lab Date: _______________________
Lab Procedure: Step-by-Step
Step 01
Compare Hundreds
Step 02
Compare Tens
Step 03
Compare Ones
324
H
T
O
?
319
H
T
O
Protocol Check Use: < > =
581
H
T
O
?
581
H
T
O
Protocol Check Use: < > =
627
H
T
O
?
727
H
T
O
Protocol Check Use: < > =
< Less Than
> Greater Than
= Equal To
Comparison Lab Scaffolds 2 (Light) Comparison Lab
Module 02: Advanced Comparisons
Scientist: ______________________
Lab Date: _______________________
Expert Strategy: Compare Digits
Check Hundreds First
425 vs 525
|
Check Tens Next
481 vs 431
492
H
T
O
512
H
T
O
Advanced Test "Is 400 more than 500?"
735
H
T
O
729
H
T
O
Advanced Test "Is 30 more than 20?"
904
H
T
O
907
H
T
O
Advanced Test "Is 4 more than 7?"
Final Goal
Circle the LARGEST number: 342, 519, 488
Comparison Mastery Worksheet (Light) Comparison Mastery
Final Lab Protocol: Skills Assessment
Scientist: ____________________ Lab Date: _____________________
< Less Than
> Greater Than
= Equal To
321
324
Protocol 01
548
458
Protocol 02
791
791
Protocol 03
105
150
Protocol 04
630
620
Protocol 05
999
998
Protocol 06
!
Status Report
Module Complete! Check your work, Scientist.
/ 6
Number Lab Answer Key (Light) Answer Key
Number Lab Mastery Protocol
Mental Math Protocols
Scaffolds 1
1. 336
2. 591
3. 462
CH: 268
Scaffolds 2
1. 347
2. 713
3. 795
CH: 215
Mastery
1. 462 | 2. 731
3. 705 | 4. 269
5. 248 | 6. 583
Comparison Protocols
Scaffolds 1
1. 324 > 319
2. 581 = 581
3. 627 < 727
Scaffolds 2
1. 492 < 512
2. 735 > 729
3. 904 < 907
CH: 519
Mastery
1. 321 < 324
2. 548 > 458
3. 791 = 791
4. 105 < 150
5. 630 > 620
6. 999 > 998
Protocol Verification: Final Key for Instructor Use Only.