🔎 Johns hopsins all childrens Grade 10Reading: grades 7-9MultiplicationWord problemsFractions of a numberAdditionDivision

The Great Stethoscope Caper

A specialized simulation robot has rolled out of the pediatric training lab with the hospital's ceremonial Golden Stethoscope right before the grand opening of the new research wing. We need to analyze the clues and track down the mischievous machine!

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 Tool	Helper Tool	Writing Hand	Antenna Light	System Vulnerability
Koch Bot	laser thermometer	soothing night light	left handed stylus	blue antenna light	heavy wool blanket static
Harvey Bot	mini microscope	soothing night light	right handed stylus	red antenna light	heavy wool blanket static
Sabin Bot	heart rate sensor	toy grabber claw	right handed stylus	green antenna light	heavy wool blanket static
Nightingale Bot	tablet screen	bubble blower	right handed stylus	red antenna light	high pitch frequency
Sanger Bot	mini microscope	bubble blower	left handed stylus	green antenna light	heavy wool blanket static
Curie Bot	heart rate sensor	lullaby music box	right handed stylus	blue antenna light	strong refrigerator magnet
Laennec Bot	tablet screen	lullaby music box	left handed stylus	green antenna light	heavy wool blanket static
Galen Bot	tablet screen	lullaby music box	left handed stylus	blue antenna light	strong refrigerator magnet
Nurse Beep	mini microscope	toy grabber claw	right handed stylus	red antenna light	heavy wool blanket static
Clara Bot	mini microscope	soothing night light	left handed stylus	green antenna light	heavy wool blanket static
Jenner Bot	tablet screen	soothing night light	left handed stylus	blue antenna light	heavy wool blanket static
Roentgen Bot	tablet screen	holographic projector	left handed stylus	green antenna light	heavy wool blanket static
Salk Bot	heart rate sensor	holographic projector	left handed stylus	green antenna light	strong refrigerator magnet
Blackwell Bot	bandage dispenser	bubble blower	right handed stylus	red antenna light	strong refrigerator magnet
Dr Sparky	bandage dispenser	holographic projector	left handed stylus	green antenna light	high pitch frequency
Watson Bot	heart rate sensor	bubble blower	right handed stylus	red antenna light	strong refrigerator magnet
Fleming Bot	mini microscope	bubble blower	left handed stylus	red antenna light	strong refrigerator magnet
Franklin Bot	heart rate sensor	holographic projector	left handed stylus	green antenna light	heavy wool blanket static
Lister Bot	mini microscope	toy grabber claw	right handed stylus	green antenna light	strong refrigerator magnet
Pasteur Bot	heart rate sensor	lullaby music box	left handed stylus	green antenna light	heavy wool blanket static
Banting Bot	laser thermometer	soothing night light	left handed stylus	blue antenna light	strong refrigerator magnet

Clue 1

Multiplication facts (1-12)

The suspect left a trail of power cells down the hallway. To find the first major lead, we need to calculate the total power output from these rows of cells.

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

144

108

4 × 1 =T

2 × 11 =N

3 × 7 =M

7 × 7 =L

11 × 8 =A

12 × 1 =Y

8 × 8 =H

6 × 6 =C

1 × 1 =S

11 × 4 =B

9 × 11 =I

12 × 12 =U

7 × 1 =D

12 × 9 =O

12 × 7 =X

8 × 10 =E

0/16 letters found

Clue 2

Word problems

We found an encrypted logbook containing puzzle-like records of patient transport times and medicine deliveries. Solving the riddle reveals the bot's secret path.

Solve each problem to learn its letter, then write the letters in the boxes to fill in the missing word.

Awitnesssawthevillainwas

118

104

There were 110 stethoscopes. 28 were used up. How many stethoscopes are left?L

There were 157 syringes. 39 were used up. How many syringes are left?H

Pediatrician lined up 4 rows of 11 stethoscopes. How many stethoscopes in all?F

Pediatrician lined up 7 rows of 6 syringes. How many syringes in all?T

Pediatrician found 30 stethoscopes yesterday and 74 more today. How many stethoscopes in all?N

Pediatrician found 22 syringes yesterday and 25 more today. How many syringes in all?E

There were 100 thermometers. 35 were used up. How many thermometers are left?A

0/7 letters found

Clue 3

Fractions of a number

The rogue bot drained only a fraction of the backup generator's energy. We must compute the exact remaining kilowatts to narrow down our search grid.

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

1/6 of 66 =S

3/5 of 40 =A

3/8 of 80 =L

1/2 of 104 =Y

3/4 of 52 =E

2/10 of 125 =M

2/6 of 141 =C

2/6 of 144 =F

1/6 of 168 =R

2/6 of 87 =W

3/6 of 62 =I

4/6 of 39 =H

1/2 of 102 =T

4/6 of 18 =O

3/6 of 42 =K

0/15 letters found

Clue 4

Addition

Volunteers gathered all the dropped digital badges from the pediatric playroom floor. Adding up the serial numbers of these badges gives us the next security code.

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

8470

8582

8470

4092

9054

6409

7524

3382

4691

9054

7524

6178

7638

6549

8470

8892

3170

7638

6409

4691

6247

7638

9054

6409

5831

4691

6549

8470

6178

2556 + 5914 =A

3647 + 2902 =W

4546 + 4508 =N

3158 + 2673 =H

3508 + 5384 =S

3826 + 3812 =O

2126 + 1044 =P

2893 + 4631 =G

3462 + 2716 =L

2389 + 2302 =E

1819 + 1563 =R

4217 + 2030 =D

2722 + 1370 =I

4062 + 2347 =T

2640 + 5942 =F

0/15 letters found

Clue 5

Division facts (1-12) — the last clue

The bot left a stash of toy awards in the therapy center. Dividing these prizes equally among the nearby clinics will help us trace where the bot went last.

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

24 ÷ 12 = ?

9 ÷ 9 = ?

24 ÷ 6 = ?

99 ÷ 9 = ?

132 ÷ 11 = ?

110 ÷ 11 = ?

21 ÷ 3 = ?

55 ÷ 11 = ?

80 ÷ 10 = ?

54 ÷ 9 = ?

3 ÷ 1 = ?

Step 2 — cross out the sentence with each answer

1.The villain measured the pulse, then projected a starry sky.

2.The villain inspected the culture slide, then turned on a soft glow.

3.The villain measured the pulse, then floated sparkling bubbles.

4.The villain inspected the culture slide, then floated sparkling bubbles.

5.The villain measured the pulse, then played a gentle tune.

6.The villain updated the patient chart, then dropped off a plush toy.

7.The villain updated the patient chart, then floated sparkling bubbles.

8.The villain inspected the culture slide, then projected a starry sky.

9.The villain updated the patient chart, then projected a starry sky.

10.The villain wrapped a quick bandage, then played a gentle tune.

11.The villain wrapped a quick bandage, then turned on a soft glow.

12.The villain wrapped a quick bandage, then projected a starry sky.

Solve it

Name the culprit

Choose the one suspect left standing.

Answer Key — The Great Stethoscope Caper

Culprit: Roentgen Bot (tablet screen · holographic projector · left handed stylus · green antenna light · heavy wool blanket static)

Clue 1 (Multiplication facts (1-12)): "THE BOT DOES NOT USE A LULLABY MUSIC BOX"
4 × 1 = 4 (T) · 2 × 11 = 22 (N) · 3 × 7 = 21 (M) · 7 × 7 = 49 (L) · 11 × 8 = 88 (A) · 12 × 1 = 12 (Y) · 8 × 8 = 64 (H) · 6 × 6 = 36 (C) · 1 × 1 = 1 (S) · 11 × 4 = 44 (B) · 9 × 11 = 99 (I) · 12 × 12 = 144 (U) · 7 × 1 = 7 (D) · 12 × 9 = 108 (O) · 12 × 7 = 84 (X) · 8 × 10 = 80 (E)
Clue 2 (Word problems): "LEFT HANDED STYLUS"
There were 110 stethoscopes. 28 were used up. How many stethoscopes are left? = 82 (L) · There were 157 syringes. 39 were used up. How many syringes are left? = 118 (H) · Pediatrician lined up 4 rows of 11 stethoscopes. How many stethoscopes in all? = 44 (F) · Pediatrician lined up 7 rows of 6 syringes. How many syringes in all? = 42 (T) · Pediatrician found 30 stethoscopes yesterday and 74 more today. How many stethoscopes in all? = 104 (N) · Pediatrician found 22 syringes yesterday and 25 more today. How many syringes in all? = 47 (E) · There were 100 thermometers. 35 were used up. How many thermometers are left? = 65 (A)
Clue 3 (Fractions of a number): "STATIC SHOCK FROM WOOL RESET THE SYSTEM"
1/6 of 66 = 11 (S) · 3/5 of 40 = 24 (A) · 3/8 of 80 = 30 (L) · 1/2 of 104 = 52 (Y) · 3/4 of 52 = 39 (E) · 2/10 of 125 = 25 (M) · 2/6 of 141 = 47 (C) · 2/6 of 144 = 48 (F) · 1/6 of 168 = 28 (R) · 2/6 of 87 = 29 (W) · 3/6 of 62 = 31 (I) · 4/6 of 39 = 26 (H) · 1/2 of 102 = 51 (T) · 4/6 of 18 = 12 (O) · 3/6 of 42 = 21 (K)
Clue 4 (Addition): "A FAINT GREEN GLOW WAS SPOTTED ON THE WALL"
2556 + 5914 = 8470 (A) · 3647 + 2902 = 6549 (W) · 4546 + 4508 = 9054 (N) · 3158 + 2673 = 5831 (H) · 3508 + 5384 = 8892 (S) · 3826 + 3812 = 7638 (O) · 2126 + 1044 = 3170 (P) · 2893 + 4631 = 7524 (G) · 3462 + 2716 = 6178 (L) · 2389 + 2302 = 4691 (E) · 1819 + 1563 = 3382 (R) · 4217 + 2030 = 6247 (D) · 2722 + 1370 = 4092 (I) · 4062 + 2347 = 6409 (T) · 2640 + 5942 = 8582 (F)
Clue 5 (Division facts (1-12)): surviving statement (box 9) → Roentgen Bot
24 ÷ 12 = 2 · 9 ÷ 9 = 1 · 24 ÷ 6 = 4 · 99 ÷ 9 = 11 · 132 ÷ 11 = 12 · 110 ÷ 11 = 10 · 21 ÷ 3 = 7 · 55 ÷ 11 = 5 · 80 ÷ 10 = 8 · 54 ÷ 9 = 6 · 3 ÷ 1 = 3

About this mystery

Grade level: Grade 10 math
Math topics: Multiplication, Word problems, Fractions of a number, Addition, Division
Reading level: grades 7-9
Theme: The Great Stethoscope Caper — set in the high-tech Innovation Lab at Johns Hopkins All Children's Hospital
Format: Interactive online & printable worksheet with answer key
Solution: One unique, verified culprit among 21 suspects

More free printable math cases

10th grade worksheets Addition worksheets Multiplication worksheets Division worksheets Fractions of a number worksheets All worksheets →

Mystery of the Cloud Peak Pirate

Grade 10

The Case of the Golden Stethoscope

Grade 10

The Great St. Pete Lab Mystery

Grade 10

The Mystery of the Missing Browns Playbook

Grade 10