Evidence Collector Worksheet

Evidence Collector

Official Math Lab Verification Document

Agent Name:

Lab Case #1

True

False

"Zoe found 9 shells. Later, she found 7 more. She has 16 shells now."

Draw evidence here:

Researcher Notes:

Lab Case #2

True

False

"A baker had 18 cupcakes. He sold 5 cupcakes. He has 11 left."

Whole

Part

Part

Lab Case #3

True

False

"Start at 5. Jump forward 13. Land on 18."

Show your jumps:

0

5

10

15

20

Lab Case #4

True

False

"A tree had 12 owls. 5 flew away. Now there are 6."

Choose any tool to verify!

Mission Final Status:

Verified Master

Evidence Collector Key

Lab Supervisor Key

Case Verification Document

Teacher Reference Only

Case #1: Zoe's Shells

TRUE

Math Evidence:

9 + 7 = 16

Correct one-to-one correspondence on the Ten Frame should show 1 full frame and 6 counters in the second frame.

First group: 9

Add 7: Fill the first (1) then second (6)

Total: 16 (Matches story)

Case #2: Baker's Cupcakes

FALSE

Math Evidence:

18 - 5 = 13

Error Check: The story claims 11, but the actual result is 13.

Whole Circle: 18

Part Circles: 5 and 13

Story said 11 (Incorrect)

Case #3: Block Collection

TRUE

Math Evidence:

5 + 13 = 18

Landing Spot on Pathway: 18.

Start at 5

Jump 13 forward

Land on 18 (Matches story)

Facilitation Tips:

• Ask students to circle the specific part of the story that "makes it false."
• Encourage "Double Checking" — if a student finds a result is False, ask them to use a different tool to prove it again.
• Focus on 1:1 counting — remind students that every jump or counter represents exactly one item.