🔎 The johns hopsins all childrGrade 10Reading: grades 7-9AdditionSubtractionMultiplicationRoundingDivision

The Great St. Pete Lab Mystery

An experimental therapy assistant drone has flown out of the pediatric rehabilitation lab! To safely bring it back to its charging cradle, we must identify which researcher accidentally loaded the incorrect navigation codes before it left the building.

Suspects

Possible suspects

Cross off a row as each clue rules it out. On screen, tap a row.

21 of 21 still in play

Name	Primary Sensor	Auxiliary Tool	Staff Eyewear	Lanyard Ribbon	Remote Override
Dr Daniel Hale Williams	Thermal Sensor	Tablet Screen	Safety Goggles	Teal Lanyard	Siren Whistle
Dr Paul Ehrlich	Sonar Diagnostic	Drone Delivery	Safety Goggles	Teal Lanyard	Flashlight Beam
Dr Gerty Cori	Thermal Sensor	Drone Delivery	No Goggles	Red Lanyard	Neodymium Magnet
Dr Jane Cooke Wright	Acoustic Monitor	Maglev Glider	No Goggles	Yellow Lanyard	Flashlight Beam
Dr Charles Drew	Laser Scanner	Holographic Projector	No Goggles	Yellow Lanyard	Flashlight Beam
Dr Emil von Behring	Sonar Diagnostic	Voice Synthesizer	No Goggles	Red Lanyard	Flashlight Beam
Dr Jonas Salk	Acoustic Monitor	Drone Delivery	Safety Goggles	Teal Lanyard	Siren Whistle
Dr Helen Rodriguez Trias	Sonar Diagnostic	Holographic Projector	No Goggles	Red Lanyard	Siren Whistle
Dr Patricia Bath	Thermal Sensor	Maglev Glider	Safety Goggles	Yellow Lanyard	Neodymium Magnet
Dr Margaret Chung	Acoustic Monitor	Tablet Screen	Safety Goggles	Yellow Lanyard	Flashlight Beam
Dr Clara Barton	UV Disinfector	Voice Synthesizer	Safety Goggles	Yellow Lanyard	Siren Whistle
Dr Virginia Avinger	UV Disinfector	Voice Synthesizer	No Goggles	Teal Lanyard	Flashlight Beam
Dr Rebecca Lee Crumpler	UV Disinfector	Tablet Screen	No Goggles	Red Lanyard	Siren Whistle
Dr Harriet Lane	UV Disinfector	Holographic Projector	Safety Goggles	Teal Lanyard	Siren Whistle
Dr Antonia Novello	Acoustic Monitor	Holographic Projector	No Goggles	Yellow Lanyard	Neodymium Magnet
Dr Alice Hamilton	Thermal Sensor	Holographic Projector	Safety Goggles	Teal Lanyard	Neodymium Magnet
Dr Helen Taussig	Thermal Sensor	Holographic Projector	No Goggles	Red Lanyard	Flashlight Beam
Dr Alexander Fleming	Thermal Sensor	Voice Synthesizer	Safety Goggles	Teal Lanyard	Siren Whistle
Dr Elizabeth Blackwell	UV Disinfector	Voice Synthesizer	Safety Goggles	Red Lanyard	Flashlight Beam
Dr Virginia Apgar	Acoustic Monitor	Holographic Projector	No Goggles	Teal Lanyard	Siren Whistle
Dr Johns Hopkins	UV Disinfector	Maglev Glider	Safety Goggles	Teal Lanyard	Siren Whistle

Clue 1

Addition

We gather the laboratory intake sheets. By calculating the sum of the newly received medicine vials, we can unlock the primary system diagnostics.

Solve each problem to learn its letter. Then write that letter in every box that shows the same number, and read the secret clue.

7120

8118

3431

9601

2054

9601

7120

3431

3984

4368

2398

7770

9476

9601

2398

3984

2398

6918

4368

3431

3707

6918

4368

7590

6495

3431

5457

2625 + 4495 =T

1823 + 2545 =L

3951 + 3639 =I

6181 + 3420 =S

630 + 1424 =Y

4543 + 3575 =H

1897 + 1810 =V

2591 + 3904 =D

3247 + 6229 =K

3704 + 4066 =C

2235 + 4683 =G

2556 + 1428 =M

2378 + 1053 =E

1195 + 1203 =A

3053 + 2404 =R

0/15 letters found

Clue 2

Subtraction

A batch of outdated sensor modules must be removed from our total inventory count. Finding the remaining balance gives us access to the secondary security log.

Solve each problem to learn its letter. Then write that letter in every box that shows the same number, and read the secret clue.

8399

4546

4689

6276

2226

6276

4376

4689

7924

8399

1194

5107

4992

4689

6276

6414

1433

4689

8399

1728

3379

5107

3379

8163

4689

6276

12177 - 3778 =T

9192 - 2778 =A

5119 - 430 =E

8791 - 4415 =P

5451 - 344 =O

4650 - 104 =H

7110 - 2118 =R

4392 - 2664 =Y

7719 - 4340 =G

7227 - 951 =S

2286 - 60 =U

4630 - 3197 =F

8076 - 152 =C

2814 - 1620 =W

11938 - 3775 =L

0/15 letters found

Clue 3

Multiplication facts (1-12)

The vaccine storage trays are arranged in identical rows and columns. Multiplying the dimensions allows us to verify the tray count and access the camera feeds.

Solve each problem to learn its letter. Then write that letter in every box that shows the same number, and read the secret clue.

108

3 × 7 =S

3 × 4 =T

9 × 5 =P

8 × 11 =E

10 × 4 =H

7 × 1 =I

2 × 11 =N

12 × 9 =R

11 × 7 =W

4 × 12 =O

4 × 9 =A

8 × 9 =L

0/12 letters found

Clue 4

Rounding

A digital clinical scale shows a precise weight value that we must round to the nearest whole pound to bypass the main security console lockout.

Solve each problem to learn its letter. Then write that letter in every box that shows the same number, and read the secret clue.

500

430

2000

500

1300

500

300

7000

500

130

1100

3700

500

2300

1300

2000

430

230

2000

9000

900

300

1100

Round 511 to the nearest hundredA

Round 1,107 to the nearest hundredD

Round 426 to the nearest tenT

Round 228 to the nearest tenB

Round 8,645 to the nearest thousandH

Round 130 to the nearest tenR

Round 314 to the nearest hundredN

Round 6,919 to the nearest thousandY

Round 3,680 to the nearest hundredW

Round 2,253 to the nearest hundredS

Round 21 to the nearest tenF

Round 1,289 to the nearest hundredL

Round 1,585 to the nearest thousandE

Round 902 to the nearest hundredI

0/14 letters found

Clue 5

Division facts (1-12) — the last clue

We need to distribute a crate of medical adhesive patches equally among the various treatment wards. Solving this division problem reveals the final command sequence.

First solve each problem. Then find each answer in the list below and cross that sentence out. One sentence will be left — that's exactly what the villain did!

Step 1 — solve these

84 ÷ 7 = ?

45 ÷ 9 = ?

42 ÷ 6 = ?

10 ÷ 1 = ?

64 ÷ 8 = ?

90 ÷ 10 = ?

4 ÷ 1 = ?

8 ÷ 4 = ?

54 ÷ 9 = ?

132 ÷ 12 = ?

6 ÷ 2 = ?

Step 2 — cross out the sentence with each answer

1.The villain boots up the acoustic monitor, then deploys the drone delivery unit.

2.The villain activates its laser scanner, then deploys the drone delivery unit.

3.The villain activates its laser scanner, then updates its tablet screen.

4.The villain engages the sonar diagnostic, then glides away on its maglev track.

5.The villain runs a UV disinfector cycle, then displays a holographic warning.

6.The villain activates its laser scanner, then speaks through the voice synthesizer.

7.The villain powers up its thermal sensor, then updates its tablet screen.

8.The villain runs a UV disinfector cycle, then updates its tablet screen.

9.The villain runs a UV disinfector cycle, then deploys the drone delivery unit.

10.The villain engages the sonar diagnostic, then deploys the drone delivery unit.

11.The villain activates its laser scanner, then glides away on its maglev track.

12.The villain powers up its thermal sensor, then speaks through the voice synthesizer.

Solve it

Name the culprit

Choose the one suspect left standing.

Answer Key — The Great St. Pete Lab Mystery

Culprit: Dr Jonas Salk (Acoustic Monitor · Drone Delivery · Safety Goggles · Teal Lanyard · Siren Whistle)

Clue 1 (Addition): "THE SYSTEM LACKS A MAGLEV GLIDER"
2625 + 4495 = 7120 (T) · 1823 + 2545 = 4368 (L) · 3951 + 3639 = 7590 (I) · 6181 + 3420 = 9601 (S) · 630 + 1424 = 2054 (Y) · 4543 + 3575 = 8118 (H) · 1897 + 1810 = 3707 (V) · 2591 + 3904 = 6495 (D) · 3247 + 6229 = 9476 (K) · 3704 + 4066 = 7770 (C) · 2235 + 4683 = 6918 (G) · 2556 + 1428 = 3984 (M) · 2378 + 1053 = 3431 (E) · 1195 + 1203 = 2398 (A) · 3053 + 2404 = 5457 (R)
Clue 2 (Subtraction): "THE SUSPECT WORE SAFETY GOGGLES"
12177 - 3778 = 8399 (T) · 9192 - 2778 = 6414 (A) · 5119 - 430 = 4689 (E) · 8791 - 4415 = 4376 (P) · 5451 - 344 = 5107 (O) · 4650 - 104 = 4546 (H) · 7110 - 2118 = 4992 (R) · 4392 - 2664 = 1728 (Y) · 7719 - 4340 = 3379 (G) · 7227 - 951 = 6276 (S) · 2286 - 60 = 2226 (U) · 4630 - 3197 = 1433 (F) · 8076 - 152 = 7924 (C) · 2814 - 1620 = 1194 (W) · 11938 - 3775 = 8163 (L)
Clue 3 (Multiplication facts (1-12)): "STOP IT WITH A SIREN WHISTLE"
3 × 7 = 21 (S) · 3 × 4 = 12 (T) · 9 × 5 = 45 (P) · 8 × 11 = 88 (E) · 10 × 4 = 40 (H) · 7 × 1 = 7 (I) · 2 × 11 = 22 (N) · 12 × 9 = 108 (R) · 11 × 7 = 77 (W) · 4 × 12 = 48 (O) · 4 × 9 = 36 (A) · 8 × 9 = 72 (L)
Clue 4 (Rounding): "A TEAL LANYARD WAS LEFT BEHIND"
Round 511 to the nearest hundred = 500 (A) · Round 1,107 to the nearest hundred = 1100 (D) · Round 426 to the nearest ten = 430 (T) · Round 228 to the nearest ten = 230 (B) · Round 8,645 to the nearest thousand = 9000 (H) · Round 130 to the nearest ten = 130 (R) · Round 314 to the nearest hundred = 300 (N) · Round 6,919 to the nearest thousand = 7000 (Y) · Round 3,680 to the nearest hundred = 3700 (W) · Round 2,253 to the nearest hundred = 2300 (S) · Round 21 to the nearest ten = 20 (F) · Round 1,289 to the nearest hundred = 1300 (L) · Round 1,585 to the nearest thousand = 2000 (E) · Round 902 to the nearest hundred = 900 (I)
Clue 5 (Division facts (1-12)): surviving statement (box 1) → Dr Jonas Salk
84 ÷ 7 = 12 · 45 ÷ 9 = 5 · 42 ÷ 6 = 7 · 10 ÷ 1 = 10 · 64 ÷ 8 = 8 · 90 ÷ 10 = 9 · 4 ÷ 1 = 4 · 8 ÷ 4 = 2 · 54 ÷ 9 = 6 · 132 ÷ 12 = 11 · 6 ÷ 2 = 3

About this mystery

Grade level: Grade 10 math
Math topics: Addition, Subtraction, Multiplication, Rounding, Division
Reading level: grades 7-9
Theme: The Great St. Pete Lab Mystery — set in The Johns Hopkins All Children's Hospital Innovation Hub
Format: Interactive online & printable worksheet with answer key
Solution: One unique, verified culprit among 21 suspects

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