Grade 4Reading: grades 1-2RoundingAdditionSubtractionMultiplicationDivision

The Lost Island Treasure Hunt

Welcome to Adventure Island! The Head Guide lost the secret key to the golden chest. A mischievous rival took it! Use your math skills and search for clues around the island to catch them.

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	Explorer Gear	Pet Companion	Writing Hand	Cap Color	Fear
Sam	Mega Flashlight	Happy Puppy	Left-handed	Green Cap	Loud Noises
Joy	Golden Compass	Playful Monkey	Left-handed	Green Cap	Tickly Spiders
Toby	Shiny Binoculars	Happy Puppy	Left-handed	Red Cap	Tickly Spiders
Jake	Jungle Map	Friendly Parrot	Right-handed	Blue Cap	Squishy Mud
Dan	Golden Compass	Swift Squirrel	Right-handed	Blue Cap	Tickly Spiders
Lily	Shiny Binoculars	Swift Squirrel	Right-handed	Blue Cap	Tickly Spiders
Max	Shiny Binoculars	Playful Monkey	Left-handed	Red Cap	Squishy Mud
Ben	Jungle Map	Playful Monkey	Right-handed	Green Cap	Tickly Spiders
Rex	Shiny Binoculars	Friendly Parrot	Left-handed	Red Cap	Loud Noises
Abby	Super Rope	Playful Monkey	Left-handed	Red Cap	Loud Noises
Eli	Jungle Map	Swift Squirrel	Left-handed	Red Cap	Tickly Spiders
Jack	Mega Flashlight	Swift Squirrel	Left-handed	Blue Cap	Tickly Spiders
Ava	Super Rope	Friendly Parrot	Left-handed	Blue Cap	Tickly Spiders
Ruby	Super Rope	Happy Puppy	Left-handed	Blue Cap	Tickly Spiders
Mia	Golden Compass	Friendly Parrot	Left-handed	Red Cap	Tickly Spiders
Zack	Super Rope	Playful Monkey	Left-handed	Blue Cap	Loud Noises
Nora	Golden Compass	Swift Squirrel	Left-handed	Blue Cap	Tickly Spiders
Amy	Super Rope	Swift Squirrel	Left-handed	Green Cap	Squishy Mud
Luke	Jungle Map	Happy Puppy	Right-handed	Green Cap	Squishy Mud
Cody	Jungle Map	Tiny Lizard	Left-handed	Blue Cap	Tickly Spiders
Emma	Shiny Binoculars	Friendly Parrot	Right-handed	Red Cap	Loud Noises

Clue 1

Rounding

We need to check the map screen. The GPS only shows rounded numbers. Round the distance to find the first 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.

1700

1100

4300

1300

110

430

3700

110

7000

900

9000

4300

7000

9000

1700

1100

3700

1300

4300

3700

200

370

Round 1,669 to the nearest hundredT

Round 434 to the nearest tenL

Round 885 to the nearest hundredD

Round 220 to the nearest hundredP

Round 31 to the nearest tenS

Round 374 to the nearest tenY

Round 9,113 to the nearest thousandO

Round 4,343 to the nearest hundredE

Round 6,613 to the nearest thousandN

Round 54 to the nearest tenU

Round 3,669 to the nearest hundredA

Round 1,267 to the nearest hundredV

Round 112 to the nearest tenI

Round 1,114 to the nearest hundredH

0/14 letters found

Clue 2

Addition

Look! We found some bags of supplies. Add up the supplies to find the next path.

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

5341

5117

2633

3101

5014

3205

2034

5014

4040

6600

6234

5014

5341

2633

3067

6600

5014

5341

5117

5341

5117

2633

3205

2633

8173

5341

5117

2034

4040

8853

2777 + 2564 =T

5048 + 3805 =D

3244 + 3356 =W

2209 + 2908 =H

1248 + 1853 =V

3063 + 3171 =R

1465 + 1168 =E

2620 + 2394 =I

1155 + 1912 =S

2199 + 1006 =L

2110 + 1930 =N

1066 + 968 =A

4511 + 3662 =F

0/13 letters found

Clue 3

Subtraction

Our water bottles are leaking. Subtract the lost water to see how far we can walk.

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

4271

6516

7052

1645

4468

2013

6452

4468

2127

6585

6452

2127

6452

4420

6452

6673

5132

6585

7365

2770

5208

4188

4468

5373

7052

6585

5208

5994 - 1723 =T

5147 - 959 =P

5889 - 681 =S

12293 - 4928 =O

6319 - 4192 =N

2810 - 1165 =V

5378 - 910 =I

11415 - 4899 =H

6726 - 1594 =F

7947 - 1274 =Y

7942 - 890 =E

6434 - 4421 =L

6450 - 2030 =W

9672 - 3220 =A

6036 - 663 =D

3259 - 489 =M

8805 - 2220 =R

0/17 letters found

Clue 4

Multiplication facts (1-12)

We see palm trees planted in neat rows. Multiply the rows to find the secret hideout.

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

100

1 × 3 =A

11 × 2 =E

10 × 4 =D

10 × 10 =S

7 × 1 =W

4 × 2 =Y

5 × 7 =B

5 × 2 =F

7 × 7 =H

8 × 8 =T

4 × 12 =L

7 × 6 =N

7 × 10 =P

11 × 6 =U

9 × 11 =I

3 × 4 =C

0/16 letters found

Clue 5

Division facts (1-12) — the last clue

We must share our snacks with the team. Divide the food evenly to get the final clue.

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

11 ÷ 11 = ?

4 ÷ 1 = ?

96 ÷ 12 = ?

36 ÷ 6 = ?

11 ÷ 1 = ?

132 ÷ 11 = ?

18 ÷ 6 = ?

100 ÷ 10 = ?

12 ÷ 6 = ?

72 ÷ 8 = ?

5 ÷ 1 = ?

Step 2 — cross out the sentence with each answer

1.The villain unrolls the jungle map on the ground, then feeds a leaf to the tiny lizard.

2.The villain looks through the shiny binoculars, then gives a dog treat to the happy puppy.

3.The villain unrolls the jungle map on the ground, then shares some fruit with the friendly parrot.

4.The villain uses the golden compass to find the path, then follows the swift squirrel up a tree.

5.The villain uses the golden compass to find the path, then feeds a leaf to the tiny lizard.

6.The villain shines the mega flashlight in the dark cave, then shares some fruit with the friendly parrot.

7.The villain throws the super rope over the big tree, then shares some fruit with the friendly parrot.

8.The villain shines the mega flashlight in the dark cave, then follows the swift squirrel up a tree.

9.The villain looks through the shiny binoculars, then feeds a leaf to the tiny lizard.

10.The villain shines the mega flashlight in the dark cave, then gives a dog treat to the happy puppy.

11.The villain throws the super rope over the big tree, then gives a dog treat to the happy puppy.

12.The villain looks through the shiny binoculars, then shares some fruit with the friendly parrot.

Solve it

Name the culprit

Choose the one suspect left standing.

Answer Key — The Lost Island Treasure Hunt

Culprit: Ava (Super Rope · Friendly Parrot · Left-handed · Blue Cap · Tickly Spiders)

Clue 1 (Rounding): "THE VILLAIN DOES NOT HAVE A PUPPY"
Round 1,669 to the nearest hundred = 1700 (T) · Round 434 to the nearest ten = 430 (L) · Round 885 to the nearest hundred = 900 (D) · Round 220 to the nearest hundred = 200 (P) · Round 31 to the nearest ten = 30 (S) · Round 374 to the nearest ten = 370 (Y) · Round 9,113 to the nearest thousand = 9000 (O) · Round 4,343 to the nearest hundred = 4300 (E) · Round 6,613 to the nearest thousand = 7000 (N) · Round 54 to the nearest ten = 50 (U) · Round 3,669 to the nearest hundred = 3700 (A) · Round 1,267 to the nearest hundred = 1300 (V) · Round 112 to the nearest ten = 110 (I) · Round 1,114 to the nearest hundred = 1100 (H)
Clue 2 (Addition): "THE VILLAIN WRITES WITH THE LEFT HAND"
2777 + 2564 = 5341 (T) · 5048 + 3805 = 8853 (D) · 3244 + 3356 = 6600 (W) · 2209 + 2908 = 5117 (H) · 1248 + 1853 = 3101 (V) · 3063 + 3171 = 6234 (R) · 1465 + 1168 = 2633 (E) · 2620 + 2394 = 5014 (I) · 1155 + 1912 = 3067 (S) · 2199 + 1006 = 3205 (L) · 2110 + 1930 = 4040 (N) · 1066 + 968 = 2034 (A) · 4511 + 3662 = 8173 (F)
Clue 3 (Subtraction): "THE VILLAIN RAN AWAY FROM SPIDERS"
5994 - 1723 = 4271 (T) · 5147 - 959 = 4188 (P) · 5889 - 681 = 5208 (S) · 12293 - 4928 = 7365 (O) · 6319 - 4192 = 2127 (N) · 2810 - 1165 = 1645 (V) · 5378 - 910 = 4468 (I) · 11415 - 4899 = 6516 (H) · 6726 - 1594 = 5132 (F) · 7947 - 1274 = 6673 (Y) · 7942 - 890 = 7052 (E) · 6434 - 4421 = 2013 (L) · 6450 - 2030 = 4420 (W) · 9672 - 3220 = 6452 (A) · 6036 - 663 = 5373 (D) · 3259 - 489 = 2770 (M) · 8805 - 2220 = 6585 (R)
Clue 4 (Multiplication facts (1-12)): "A SHINY BLUE CAP WAS LEFT BEHIND"
1 × 3 = 3 (A) · 11 × 2 = 22 (E) · 10 × 4 = 40 (D) · 10 × 10 = 100 (S) · 7 × 1 = 7 (W) · 4 × 2 = 8 (Y) · 5 × 7 = 35 (B) · 5 × 2 = 10 (F) · 7 × 7 = 49 (H) · 8 × 8 = 64 (T) · 4 × 12 = 48 (L) · 7 × 6 = 42 (N) · 7 × 10 = 70 (P) · 11 × 6 = 66 (U) · 9 × 11 = 99 (I) · 3 × 4 = 12 (C)
Clue 5 (Division facts (1-12)): surviving statement (box 7) → Ava
11 ÷ 11 = 1 · 4 ÷ 1 = 4 · 96 ÷ 12 = 8 · 36 ÷ 6 = 6 · 11 ÷ 1 = 11 · 132 ÷ 11 = 12 · 18 ÷ 6 = 3 · 100 ÷ 10 = 10 · 12 ÷ 6 = 2 · 72 ÷ 8 = 9 · 5 ÷ 1 = 5

About this mystery

Grade level: Grade 4 math
Math topics: Rounding, Addition, Subtraction, Multiplication, Division
Reading level: grades 1-2
Theme: The Lost Island Treasure Hunt — set in Adventure Island
Format: Interactive online & printable worksheet with answer key
Solution: One unique, verified culprit among 21 suspects

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