🔎 ShrekGrade 4Reading: grades 3-4MultiplicationRoundingSkip countingPlace valueDivision

The Swamp Potion Mystery

Someone splashed green slime all over Marshland Hall and ran off! Detective, help Chief Marsh Ranger Brok figure out which bandit did it before the grand mud festival begins.

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	Swamp Skill	Marsh Gadget	Dominant Hand	Fur Color	Dislike
Shrek Simon	Onion Bombing	Mud Scooter	Right Handed	Brown Scruff	Clean Towels
Fiona Fox	Mud Slagging	Swamp Compass	Left Handed	Brown Scruff	Clean Towels
Puss Pierre	Mud Slagging	Mud Scooter	Left Handed	Green Scruff	Sweet Perfume
Ogre Barnaby	Burp Blasting	Earwax Torch	Right Handed	Green Scruff	Clean Towels
Donkey Dale	Bug Snacking	Earwax Torch	Left Handed	Brown Scruff	Clean Towels
Witch Wanda	Onion Bombing	Slug Cannon	Right Handed	Green Scruff	Clean Towels
Boggy Bob	Mud Slagging	Earwax Torch	Left Handed	Brown Scruff	Fresh Soap
Knight Norbert	Bug Snacking	Mud Scooter	Right Handed	Brown Scruff	Fresh Soap
Bear Barnaby	Onion Bombing	Swamp Compass	Right Handed	Grey Scruff	Sweet Perfume
Gargoyle Grom	Onion Bombing	Rotten Shield	Left Handed	Brown Scruff	Sweet Perfume
Fairy Flora	Bug Snacking	Earwax Torch	Right Handed	Grey Scruff	Clean Towels
Troll Tor	Onion Bombing	Swamp Compass	Right Handed	Brown Scruff	Clean Towels
Dragon Greta	Burp Blasting	Swamp Compass	Right Handed	Brown Scruff	Clean Towels
Cookie Carl	Burp Blasting	Rotten Shield	Right Handed	Brown Scruff	Sweet Perfume
Wolf Walter	Onion Bombing	Rotten Shield	Right Handed	Green Scruff	Fresh Soap
Goblin Gus	Mud Slagging	Earwax Torch	Right Handed	Brown Scruff	Clean Towels
Piper Pete	Burp Blasting	Rotten Shield	Right Handed	Brown Scruff	Clean Towels
Gnome Gideon	Mud Slagging	Mud Scooter	Right Handed	Grey Scruff	Sweet Perfume
Mirror Mark	Onion Bombing	Swamp Compass	Left Handed	Grey Scruff	Sweet Perfume
Swamp Sam	Burp Blasting	Mud Scooter	Right Handed	Grey Scruff	Fresh Soap
Prince Percy	Burp Blasting	Rotten Shield	Right Handed	Green Scruff	Clean Towels

Clue 1

Multiplication facts (1-12)

You count the rows of smashed pumpkins in the swamp garden to get your first hint.

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

7 × 7 =T

9 × 7 =C

8 × 8 =N

2 × 2 =B

9 × 6 =S

3 × 11 =U

10 × 4 =I

11 × 2 =A

2 × 1 =E

8 × 4 =M

1 × 10 =R

4 × 11 =O

12 × 5 =D

11 × 5 =H

0/14 letters found

Clue 2

Rounding

A mud covered signpost gives an approximate distance that points to a clue.

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

2000

900

1300

370

900

110

1700

3000

430

1300

700

1700

900

1700

430

370

1100

7000

1100

110

5000

200

7000

900

1700

1300

3000

Round 1,976 to the nearest thousandF

Round 5,131 to the nearest thousandL

Round 3,375 to the nearest thousandW

Round 52 to the nearest tenP

Round 427 to the nearest tenA

Round 6,689 to the nearest thousandE

Round 668 to the nearest hundredG

Round 18 to the nearest tenO

Round 1,707 to the nearest hundredH

Round 182 to the nearest hundredM

Round 88 to the nearest tenI

Round 1,290 to the nearest hundredR

Round 367 to the nearest tenN

Round 108 to the nearest tenS

Round 928 to the nearest hundredT

Round 1,052 to the nearest hundredD

0/16 letters found

Clue 3

Skip counting

Following footsteps in equal jumps across the marsh lily pads reveals the next clue.

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

130

100

140

100

140

Skip-count by 2s. Fill the blank: 2, 4, 6, 8, 10, 12, 14, 16, 18, ___, 22, 24T

Skip-count by 5s. Fill the blank: 5, 10, 15, 20, 25, 30, 35, 40, 45, 50, ___, 60, 65C

Skip-count by 2s. Fill the blank: 2, 4, 6, 8, 10, 12, 14, 16, 18, 20, ___, 24, 26F

Skip-count by 10s. Fill the blank: 10, 20, 30, 40, ___, 60, 70R

Skip-count by 3s. Fill the blank: 3, 6, 9, 12, 15, ___, 21, 24N

Skip-count by 10s. Fill the blank: 10, 20, 30, 40, 50, 60, 70, 80, 90, 100, 110, 120, ___, 140, 150D

Skip-count by 5s. Fill the blank: 5, 10, 15, 20, 25, 30, 35, 40, 45, 50, 55, 60, 65, ___, 75, 80S

Skip-count by 3s. Fill the blank: 3, 6, 9, 12, 15, 18, ___, 24, 27E

Skip-count by 3s. Fill the blank: 3, 6, 9, 12, 15, 18, 21, 24, 27, 30, ___, 36, 39H

Skip-count by 5s. Fill the blank: 5, 10, 15, 20, 25, 30, 35, 40, 45, 50, 55, ___, 65, 70G

Skip-count by 10s. Fill the blank: 10, 20, 30, 40, 50, 60, 70, 80, 90, 100, 110, 120, 130, ___, 150, 160W

Skip-count by 10s. Fill the blank: 10, 20, 30, 40, 50, 60, 70, 80, 90, ___, 110, 120O

Skip-count by 2s. Fill the blank: 2, 4, 6, 8, ___, 12, 14M

Skip-count by 3s. Fill the blank: 3, 6, 9, 12, 15, 18, 21, 24, 27, 30, 33, 36, ___, 42, 45I

Skip-count by 2s. Fill the blank: 2, 4, 6, 8, 10, 12, ___, 16, 18A

Skip-count by 5s. Fill the blank: 5, 10, ___, 20, 25L

0/16 letters found

Clue 4

Place value

Digging through marshland logs you find a numbered chest key that exposes the next detail.

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

2000

100

200

600

9000

8000

600

8000

500

7000

200

300

9000

800

600

200

5000

400

What is the value of the 2 in 32,987?M

What is the value of the 8 in 8,342?E

What is the value of the 6 in 655?S

What is the value of the 2 in 1,217?R

What is the value of the 4 in 6,415?F

What is the value of the 9 in 594?D

What is the value of the 9 in 39,805?W

What is the value of the 5 in 95,663?U

What is the value of the 7 in 37,112?B

What is the value of the 4 in 2,749?C

What is the value of the 8 in 829?N

What is the value of the 3 in 357?O

What is the value of the 1 in 6,159?A

What is the value of the 5 in 1,500?L

What is the value of the 7 in 4,072?H

0/15 letters found

Clue 5

Division facts (1-12) — the last clue

Dividing swamp berries equally among the witnesses calms them down so they reveal the last piece.

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

30 ÷ 5 = ?

6 ÷ 3 = ?

11 ÷ 11 = ?

9 ÷ 3 = ?

40 ÷ 5 = ?

9 ÷ 1 = ?

10 ÷ 2 = ?

99 ÷ 9 = ?

36 ÷ 3 = ?

12 ÷ 3 = ?

20 ÷ 2 = ?

Step 2 — cross out the sentence with each answer

1.The villain tossed onion bombs everywhere, then checked a swamp compass.

2.The villain let out a mighty burp, then checked a swamp compass.

3.The villain splashed mud across the floor, then fired a slug cannon.

4.The villain slid down the muddy bank, then checked a swamp compass.

5.The villain slid down the muddy bank, then hid behind a rotten shield.

6.The villain splashed mud across the floor, then lit the way with an earwax torch.

7.The villain let out a mighty burp, then hid behind a rotten shield.

8.The villain tossed onion bombs everywhere, then zoomed away on a mud scooter.

9.The villain splashed mud across the floor, then checked a swamp compass.

10.The villain slid down the muddy bank, then zoomed away on a mud scooter.

11.The villain splashed mud across the floor, then zoomed away on a mud scooter.

12.The villain munched on crunchy swamp beetles, then hid behind a rotten shield.

Solve it

Name the culprit

Choose the one suspect left standing.

Answer Key — The Swamp Potion Mystery

Culprit: Piper Pete (Burp Blasting · Rotten Shield · Right Handed · Brown Scruff · Clean Towels)

Clue 1 (Multiplication facts (1-12)): "THE BANDIT DOES NOT USE A MUD SCOOTER"
7 × 7 = 49 (T) · 9 × 7 = 63 (C) · 8 × 8 = 64 (N) · 2 × 2 = 4 (B) · 9 × 6 = 54 (S) · 3 × 11 = 33 (U) · 10 × 4 = 40 (I) · 11 × 2 = 22 (A) · 2 × 1 = 2 (E) · 8 × 4 = 32 (M) · 1 × 10 = 10 (R) · 4 × 11 = 44 (O) · 12 × 5 = 60 (D) · 11 × 5 = 55 (H)
Clue 2 (Rounding): "FOOTPRINTS SHOW A RIGHT HANDED SLIME THROW"
Round 1,976 to the nearest thousand = 2000 (F) · Round 5,131 to the nearest thousand = 5000 (L) · Round 3,375 to the nearest thousand = 3000 (W) · Round 52 to the nearest ten = 50 (P) · Round 427 to the nearest ten = 430 (A) · Round 6,689 to the nearest thousand = 7000 (E) · Round 668 to the nearest hundred = 700 (G) · Round 18 to the nearest ten = 20 (O) · Round 1,707 to the nearest hundred = 1700 (H) · Round 182 to the nearest hundred = 200 (M) · Round 88 to the nearest ten = 90 (I) · Round 1,290 to the nearest hundred = 1300 (R) · Round 367 to the nearest ten = 370 (N) · Round 108 to the nearest ten = 110 (S) · Round 928 to the nearest hundred = 900 (T) · Round 1,052 to the nearest hundred = 1100 (D)
Clue 3 (Skip counting): "THE RANGER SCARED THEM OFF WITH CLEAN TOWELS"
Skip-count by 2s. Fill the blank: 2, 4, 6, 8, 10, 12, 14, 16, 18, ___, 22, 24 = 20 (T) · Skip-count by 5s. Fill the blank: 5, 10, 15, 20, 25, 30, 35, 40, 45, 50, ___, 60, 65 = 55 (C) · Skip-count by 2s. Fill the blank: 2, 4, 6, 8, 10, 12, 14, 16, 18, 20, ___, 24, 26 = 22 (F) · Skip-count by 10s. Fill the blank: 10, 20, 30, 40, ___, 60, 70 = 50 (R) · Skip-count by 3s. Fill the blank: 3, 6, 9, 12, 15, ___, 21, 24 = 18 (N) · Skip-count by 10s. Fill the blank: 10, 20, 30, 40, 50, 60, 70, 80, 90, 100, 110, 120, ___, 140, 150 = 130 (D) · Skip-count by 5s. Fill the blank: 5, 10, 15, 20, 25, 30, 35, 40, 45, 50, 55, 60, 65, ___, 75, 80 = 70 (S) · Skip-count by 3s. Fill the blank: 3, 6, 9, 12, 15, 18, ___, 24, 27 = 21 (E) · Skip-count by 3s. Fill the blank: 3, 6, 9, 12, 15, 18, 21, 24, 27, 30, ___, 36, 39 = 33 (H) · Skip-count by 5s. Fill the blank: 5, 10, 15, 20, 25, 30, 35, 40, 45, 50, 55, ___, 65, 70 = 60 (G) · Skip-count by 10s. Fill the blank: 10, 20, 30, 40, 50, 60, 70, 80, 90, 100, 110, 120, 130, ___, 150, 160 = 140 (W) · Skip-count by 10s. Fill the blank: 10, 20, 30, 40, 50, 60, 70, 80, 90, ___, 110, 120 = 100 (O) · Skip-count by 2s. Fill the blank: 2, 4, 6, 8, ___, 12, 14 = 10 (M) · Skip-count by 3s. Fill the blank: 3, 6, 9, 12, 15, 18, 21, 24, 27, 30, 33, 36, ___, 42, 45 = 39 (I) · Skip-count by 2s. Fill the blank: 2, 4, 6, 8, 10, 12, ___, 16, 18 = 14 (A) · Skip-count by 5s. Fill the blank: 5, 10, ___, 20, 25 = 15 (L)
Clue 4 (Place value): "MARSH WEEDS HELD BROWN SCRUFF"
What is the value of the 2 in 32,987? = 2000 (M) · What is the value of the 8 in 8,342? = 8000 (E) · What is the value of the 6 in 655? = 600 (S) · What is the value of the 2 in 1,217? = 200 (R) · What is the value of the 4 in 6,415? = 400 (F) · What is the value of the 9 in 594? = 90 (D) · What is the value of the 9 in 39,805? = 9000 (W) · What is the value of the 5 in 95,663? = 5000 (U) · What is the value of the 7 in 37,112? = 7000 (B) · What is the value of the 4 in 2,749? = 40 (C) · What is the value of the 8 in 829? = 800 (N) · What is the value of the 3 in 357? = 300 (O) · What is the value of the 1 in 6,159? = 100 (A) · What is the value of the 5 in 1,500? = 500 (L) · What is the value of the 7 in 4,072? = 70 (H)
Clue 5 (Division facts (1-12)): surviving statement (box 7) → Piper Pete
30 ÷ 5 = 6 · 6 ÷ 3 = 2 · 11 ÷ 11 = 1 · 9 ÷ 3 = 3 · 40 ÷ 5 = 8 · 9 ÷ 1 = 9 · 10 ÷ 2 = 5 · 99 ÷ 9 = 11 · 36 ÷ 3 = 12 · 12 ÷ 3 = 4 · 20 ÷ 2 = 10

About this mystery

Grade level: Grade 4 math
Math topics: Multiplication, Rounding, Skip counting, Place value, Division
Reading level: grades 3-4
Theme: The Swamp Potion Mystery — set in Muddy Marshlands
Format: Interactive online & printable worksheet with answer key
Solution: One unique, verified culprit among 21 suspects

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