Grade 3Reading: grades 3-4Place valueAdditionRoundingSkip countingMissing addends

The Lost Map Mystery

Someone snatched the ancient treasure map from Mapmaker Maya's tent! Detective, decipher the clues left behind to unmask the Jungle Bandit.

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	Gadget	Gear	Stance	Bandana	Weakness
Ranger Riley	Decoder Ring	Canvas Backpack	Right Handed	Red Bandana	Loud Noise
Forest Finn	Flashlight	Binoculars	Left Handed	Blue Bandana	Bright Light
Reef Ricky	Compass Watch	Rescue Rope	Left Handed	Red Bandana	Bright Light
Safari Sarah	Flashlight	Canvas Backpack	Left Handed	Blue Bandana	Cold Water
Desert Daisy	Decoder Ring	Climbing Boots	Right Handed	Red Bandana	Cold Water
Mountain Mia	Compass Watch	Binoculars	Right Handed	Red Bandana	Cold Water
Captain Cora	Signal Whistle	Climbing Boots	Right Handed	Blue Bandana	Bright Light
River Rider Leo	Grappling Hook	Climbing Boots	Right Handed	Red Bandana	Loud Noise
Jungle Jane	Flashlight	Binoculars	Right Handed	Red Bandana	Cold Water
Valley Scout Vance	Decoder Ring	Adventure Helmet	Left Handed	Red Bandana	Cold Water
Explorer Ethan	Signal Whistle	Canvas Backpack	Right Handed	Red Bandana	Cold Water
Navigator Noah	Grappling Hook	Climbing Boots	Right Handed	Blue Bandana	Cold Water
Hiker Hannah	Compass Watch	Adventure Helmet	Right Handed	Red Bandana	Loud Noise
Swamp Sally	Grappling Hook	Binoculars	Right Handed	Red Bandana	Bright Light
Pathfinder Penny	Signal Whistle	Climbing Boots	Right Handed	Yellow Bandana	Bright Light
Treasure Ben	Signal Whistle	Climbing Boots	Right Handed	Red Bandana	Cold Water
Valley Violet	Signal Whistle	Binoculars	Left Handed	Yellow Bandana	Loud Noise
Canyon Cliff	Flashlight	Climbing Boots	Right Handed	Red Bandana	Loud Noise
Cave Cody	Decoder Ring	Rescue Rope	Right Handed	Yellow Bandana	Cold Water
Outback Owen	Grappling Hook	Binoculars	Right Handed	Blue Bandana	Cold Water
Tracker Toby	Flashlight	Rescue Rope	Left Handed	Blue Bandana	Loud Noise

Clue 1

Place value

The mapmaker noticed mystery digits stamped on a brass crate near the campsite.

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

8000

2000

500

4000

3000

5000

3000

100

5000

4000

200

4000

3000

2000

4000

5000

4000

200

9000

6000

4000

200

9000

What is the value of the 5 in 6,256?T

What is the value of the 6 in 4,767?I

What is the value of the 2 in 2,356?V

What is the value of the 6 in 6,814?P

What is the value of the 1 in 198?U

What is the value of the 5 in 5,349?S

What is the value of the 9 in 9,458?K

What is the value of the 1 in 419?B

What is the value of the 8 in 8,720?H

What is the value of the 4 in 542?E

What is the value of the 9 in 3,296?O

What is the value of the 5 in 529?L

What is the value of the 4 in 14,895?A

What is the value of the 2 in 726?D

What is the value of the 3 in 43,445?N

What is the value of the 2 in 249?C

0/16 letters found

Clue 2

Addition

Detective Sam counted up all the muddy footprints left near the riverbank.

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

714

560

438

714

819

589

294

647

804

560

802

277

714

560

438

629

248

804

438

450

714

560

438

578

819

578

266

560

714

560

589

705

450

392 + 322 =T

392 + 237 =Y

462 + 357 =R

238 + 322 =H

278 + 524 =O

157 + 281 =E

146 + 148 =C

218 + 232 =D

358 + 231 =A

377 + 201 =I

130 + 118 =U

242 + 405 =K

174 + 103 =W

548 + 256 =S

170 + 96 =G

398 + 307 =N

0/16 letters found

Clue 3

Rounding

The explorer checked the digital altimeter but it only shows rounded numbers.

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

7000

3000

400

9000

2000

400

900

5000

500

800

900

2000

300

7000

900

2000

600

700

600

4000

6000

900

7000

400

Round 6,794 to the nearest thousandT

Round 689 to the nearest hundredC

Round 67 to the nearest tenF

Round 4,855 to the nearest thousandK

Round 948 to the nearest hundredA

Round 16 to the nearest tenD

Round 829 to the nearest hundredB

Round 3,184 to the nearest thousandH

Round 496 to the nearest hundredY

Round 273 to the nearest hundredI

Round 583 to the nearest hundredO

Round 4,320 to the nearest thousandL

Round 46 to the nearest tenM

Round 2,389 to the nearest thousandN

Round 27 to the nearest tenR

Round 9,436 to the nearest thousandS

Round 5,732 to the nearest thousandW

Round 415 to the nearest hundredE

0/18 letters found

Clue 4

Skip counting

You count the stepping stones across the river in equal groups.

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

Skip-count by 5s. Fill the blank: 5, 10, 15, 20, 25, 30, ___, 40, 45F

Skip-count by 10s. Fill the blank: 10, 20, 30, 40, 50, 60, 70, ___, 90, 100E

Skip-count by 2s. Fill the blank: 2, 4, 6, 8, 10, 12, 14, 16, 18, 20, 22, 24, 26, ___, 30, 32S

Skip-count by 10s. Fill the blank: 10, 20, ___, 40, 50D

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

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

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

Skip-count by 5s. Fill the blank: 5, 10, 15, ___, 25, 30A

Skip-count by 3s. Fill the blank: 3, 6, ___, 12, 15B

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

Skip-count by 3s. Fill the blank: 3, 6, 9, 12, 15, 18, 21, 24, 27, 30, 33, 36, 39, ___, 45, 48H

Skip-count by 3s. Fill the blank: 3, 6, 9, ___, 15, 18C

Skip-count by 2s. Fill the blank: 2, 4, ___, 8, 10N

0/13 letters found

Clue 5

Missing addends — the last clue

Some gear supplies are missing from the pack and you need to find the missing amount.

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

9 + ___ = 15

7 + ___ = 9

5 + ___ = 8

9 + ___ = 21

4 + ___ = 14

1 + ___ = 10

1 + ___ = 12

7 + ___ = 11

10 + ___ = 17

7 + ___ = 15

6 + ___ = 7

Step 2 — cross out the sentence with each answer

1.The villain swung across the canyon, then scaled the steep cliff.

2.The villain checked the secret compass, then spotted the hidden landmark.

3.The villain lit up the dark cave, then spotted the hidden landmark.

4.The villain checked the secret compass, then scaled the steep cliff.

5.The villain cracked the ancient symbol code, then scaled the steep cliff.

6.The villain blew a sharp warning whistle, then scaled the steep cliff.

7.The villain checked the secret compass, then snapped the chin strap tight.

8.The villain lit up the dark cave, then pulled up the heavy rope.

9.The villain blew a sharp warning whistle, then snapped the chin strap tight.

10.The villain swung across the canyon, then snapped the chin strap tight.

11.The villain cracked the ancient symbol code, then snapped the chin strap tight.

12.The villain lit up the dark cave, then stashed the map inside.

Solve it

Name the culprit

Choose the one suspect left standing.

Answer Key — The Lost Map Mystery

Culprit: Desert Daisy (Decoder Ring · Climbing Boots · Right Handed · Red Bandana · Cold Water)

Clue 1 (Place value): "THE VILLAIN DOES NOT USE A CANVAS BACKPACK"
What is the value of the 5 in 6,256? = 50 (T) · What is the value of the 6 in 4,767? = 60 (I) · What is the value of the 2 in 2,356? = 2000 (V) · What is the value of the 6 in 6,814? = 6000 (P) · What is the value of the 1 in 198? = 100 (U) · What is the value of the 5 in 5,349? = 5000 (S) · What is the value of the 9 in 9,458? = 9000 (K) · What is the value of the 1 in 419? = 10 (B) · What is the value of the 8 in 8,720? = 8000 (H) · What is the value of the 4 in 542? = 40 (E) · What is the value of the 9 in 3,296? = 90 (O) · What is the value of the 5 in 529? = 500 (L) · What is the value of the 4 in 14,895? = 4000 (A) · What is the value of the 2 in 726? = 20 (D) · What is the value of the 3 in 43,445? = 3000 (N) · What is the value of the 2 in 249? = 200 (C)
Clue 2 (Addition): "THE TRACKS SHOW THEY USED THEIR RIGHT HAND"
392 + 322 = 714 (T) · 392 + 237 = 629 (Y) · 462 + 357 = 819 (R) · 238 + 322 = 560 (H) · 278 + 524 = 802 (O) · 157 + 281 = 438 (E) · 146 + 148 = 294 (C) · 218 + 232 = 450 (D) · 358 + 231 = 589 (A) · 377 + 201 = 578 (I) · 130 + 118 = 248 (U) · 242 + 405 = 647 (K) · 174 + 103 = 277 (W) · 548 + 256 = 804 (S) · 170 + 96 = 266 (G) · 398 + 307 = 705 (N)
Clue 3 (Rounding): "THE SNEAKY BANDIT RAN FROM COLD WATER"
Round 6,794 to the nearest thousand = 7000 (T) · Round 689 to the nearest hundred = 700 (C) · Round 67 to the nearest ten = 70 (F) · Round 4,855 to the nearest thousand = 5000 (K) · Round 948 to the nearest hundred = 900 (A) · Round 16 to the nearest ten = 20 (D) · Round 829 to the nearest hundred = 800 (B) · Round 3,184 to the nearest thousand = 3000 (H) · Round 496 to the nearest hundred = 500 (Y) · Round 273 to the nearest hundred = 300 (I) · Round 583 to the nearest hundred = 600 (O) · Round 4,320 to the nearest thousand = 4000 (L) · Round 46 to the nearest ten = 50 (M) · Round 2,389 to the nearest thousand = 2000 (N) · Round 27 to the nearest ten = 30 (R) · Round 9,436 to the nearest thousand = 9000 (S) · Round 5,732 to the nearest thousand = 6000 (W) · Round 415 to the nearest hundred = 400 (E)
Clue 4 (Skip counting): "FOUND A SNAGGED RED BANDANA ON A BRANCH"
Skip-count by 5s. Fill the blank: 5, 10, 15, 20, 25, 30, ___, 40, 45 = 35 (F) · Skip-count by 10s. Fill the blank: 10, 20, 30, 40, 50, 60, 70, ___, 90, 100 = 80 (E) · Skip-count by 2s. Fill the blank: 2, 4, 6, 8, 10, 12, 14, 16, 18, 20, 22, 24, 26, ___, 30, 32 = 28 (S) · Skip-count by 10s. Fill the blank: 10, 20, ___, 40, 50 = 30 (D) · Skip-count by 2s. Fill the blank: 2, 4, 6, 8, 10, 12, 14, ___, 18, 20 = 16 (O) · Skip-count by 5s. Fill the blank: 5, 10, ___, 20, 25 = 15 (R) · Skip-count by 3s. Fill the blank: 3, 6, 9, 12, 15, 18, ___, 24, 27 = 21 (G) · Skip-count by 5s. Fill the blank: 5, 10, 15, ___, 25, 30 = 20 (A) · Skip-count by 3s. Fill the blank: 3, 6, ___, 12, 15 = 9 (B) · Skip-count by 2s. Fill the blank: 2, 4, 6, 8, 10, 12, ___, 16, 18 = 14 (U) · Skip-count by 3s. Fill the blank: 3, 6, 9, 12, 15, 18, 21, 24, 27, 30, 33, 36, 39, ___, 45, 48 = 42 (H) · Skip-count by 3s. Fill the blank: 3, 6, 9, ___, 15, 18 = 12 (C) · Skip-count by 2s. Fill the blank: 2, 4, ___, 8, 10 = 6 (N)
Clue 5 (Missing addends): surviving statement (box 5) → Desert Daisy
9 + ___ = 15 = 6 · 7 + ___ = 9 = 2 · 5 + ___ = 8 = 3 · 9 + ___ = 21 = 12 · 4 + ___ = 14 = 10 · 1 + ___ = 10 = 9 · 1 + ___ = 12 = 11 · 7 + ___ = 11 = 4 · 10 + ___ = 17 = 7 · 7 + ___ = 15 = 8 · 6 + ___ = 7 = 1

About this mystery

Grade level: Grade 3 math
Math topics: Place value, Addition, Rounding, Skip counting, Missing addends
Reading level: grades 3-4
Theme: The Lost Map Mystery — set in Bananawale Island
Format: Interactive online & printable worksheet with answer key
Solution: One unique, verified culprit among 21 suspects

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