Grade 4Reading: grades 1-2RoundingAdditionSubtractionMultiplicationDivision

Mystery at Treehouse Base

A sneaky bandit took the golden map from the Treehouse Base! Head Scout Pip needs your help. Solve the math clues to catch the villain.

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	Main Tool	Gear	Handedness	Hair Style	Weakness
Clara	smoke bomb	walkie talkie	right handed	blonde braid	loud whistle
Eli	stealth boots	flash beam	right handed	brown spikes	itchy mud
Ella	smoke bomb	walkie talkie	right handed	blonde braid	bright light
Nora	grappling hook	metal shield	right handed	blonde braid	bright light
Max	stealth boots	night goggles	left handed	blonde braid	bright light
Luke	grappling hook	walkie talkie	right handed	blonde braid	bright light
Grace	grappling hook	walkie talkie	left handed	blonde braid	bright light
Leo	grappling hook	night goggles	left handed	red curls	itchy mud
Chloe	smoke bomb	compass watch	left handed	brown spikes	bright light
Ivy	stealth boots	flash beam	right handed	red curls	loud whistle
Sam	smoke bomb	night goggles	right handed	blonde braid	bright light
Noah	rope launcher	walkie talkie	right handed	blonde braid	loud whistle
Lily	glider wings	flash beam	left handed	brown spikes	bright light
Ava	stealth boots	compass watch	right handed	blonde braid	loud whistle
Mia	grappling hook	compass watch	right handed	blonde braid	loud whistle
Ruby	rope launcher	metal shield	right handed	red curls	itchy mud
Ben	grappling hook	metal shield	right handed	red curls	loud whistle
Zoe	rope launcher	metal shield	left handed	blonde braid	loud whistle
Owen	stealth boots	walkie talkie	left handed	brown spikes	itchy mud
Liam	grappling hook	walkie talkie	right handed	blonde braid	loud whistle
Finn	grappling hook	night goggles	right handed	blonde braid	loud whistle

Clue 1

Rounding

The scanner radar rounds distance to the nearest hundred.

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

700

290

3700

7000

130

2000

700

2000

9000

290

300

130

9000

700

200

300

290

7000

9000

230

7000

300

3000

7000

700

Round 736 to the nearest hundredT

Round 292 to the nearest tenE

Round 2,575 to the nearest thousandW

Round 3,731 to the nearest hundredB

Round 72 to the nearest tenM

Round 170 to the nearest hundredU

Round 336 to the nearest hundredS

Round 21 to the nearest tenI

Round 2,311 to the nearest thousandD

Round 26 to the nearest tenC

Round 231 to the nearest tenP

Round 127 to the nearest tenN

Round 6,554 to the nearest thousandA

Round 8,571 to the nearest thousandO

Round 94 to the nearest tenH

0/15 letters found

Clue 2

Addition

We counted all the supply crates left in the camp store.

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

2031

6819

7656

3922

6296

5637

7307

2031

2267

6819

6169

7953

7656

7953

7307

3922

9291

6296

9291

7656

2267

7307

9027

2573

5637

1285 + 746 =W

3666 + 3990 =T

3932 + 2887 =I

3896 + 5395 =D

993 + 1580 =K

4055 + 2114 =G

2521 + 1401 =N

6139 + 2888 =C

2672 + 5281 =H

4287 + 3020 =A

2662 + 3634 =E

3622 + 2015 =S

962 + 1305 =R

0/13 letters found

Clue 3

Subtraction

We checked how many trail maps were missing from the chest.

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

2737

6467

1673

3466

8854

2534

4654

7909

2737

3594

4898

1673

4654

3594

2057

2775

7427

4898

2775

3705

4654

4753

6467

7909

7935

2737

4898

1673

6436 - 3699 =T

3497 - 1824 =E

7658 - 4064 =F

6036 - 3261 =O

7855 - 3201 =D

10342 - 2407 =S

4484 - 1950 =N

6262 - 1364 =L

8996 - 142 =A

3859 - 393 =B

9798 - 1889 =I

4799 - 2742 =R

6135 - 1382 =W

3738 - 33 =U

8588 - 2121 =H

9835 - 2408 =M

0/16 letters found

Clue 4

Multiplication facts (1-12)

We lined up the search lantern packs in equal rows.

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

144

108

100

4 × 11 =W

4 × 8 =E

11 × 3 =U

5 × 5 =R

3 × 8 =B

9 × 1 =O

8 × 7 =D

7 × 2 =I

7 × 10 =L

7 × 4 =N

12 × 12 =F

10 × 10 =C

9 × 12 =S

11 × 2 =T

1 × 6 =H

4 × 10 =A

0/16 letters found

Clue 5

Division facts (1-12) — the last clue

We shared the rescue snacks equally among the scout teams.

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

48 ÷ 6 = ?

2 ÷ 1 = ?

5 ÷ 1 = ?

144 ÷ 12 = ?

7 ÷ 1 = ?

7 ÷ 7 = ?

6 ÷ 2 = ?

90 ÷ 10 = ?

70 ÷ 7 = ?

42 ÷ 7 = ?

32 ÷ 8 = ?

Step 2 — cross out the sentence with each answer

1.The villain flew with glider wings, then wore night goggles.

2.The villain used a grappling hook, then wore night goggles.

3.The villain snuck in stealth boots, then checked a compass watch.

4.The villain shot a rope launcher, then shined a flash beam.

5.The villain shot a rope launcher, then used a walkie talkie.

6.The villain snuck in stealth boots, then used a walkie talkie.

7.The villain flew with glider wings, then shined a flash beam.

8.The villain threw a smoke bomb, then used a walkie talkie.

9.The villain threw a smoke bomb, then held a metal shield.

10.The villain snuck in stealth boots, then shined a flash beam.

11.The villain used a grappling hook, then used a walkie talkie.

12.The villain threw a smoke bomb, then wore night goggles.

Solve it

Name the culprit

Choose the one suspect left standing.

Answer Key — Mystery at Treehouse Base

Culprit: Liam (grappling hook · walkie talkie · right handed · blonde braid · loud whistle)

Clue 1 (Rounding): "THE BANDIT DOES NOT USE A COMPASS WATCH"
Round 736 to the nearest hundred = 700 (T) · Round 292 to the nearest ten = 290 (E) · Round 2,575 to the nearest thousand = 3000 (W) · Round 3,731 to the nearest hundred = 3700 (B) · Round 72 to the nearest ten = 70 (M) · Round 170 to the nearest hundred = 200 (U) · Round 336 to the nearest hundred = 300 (S) · Round 21 to the nearest ten = 20 (I) · Round 2,311 to the nearest thousand = 2000 (D) · Round 26 to the nearest ten = 30 (C) · Round 231 to the nearest ten = 230 (P) · Round 127 to the nearest ten = 130 (N) · Round 6,554 to the nearest thousand = 7000 (A) · Round 8,571 to the nearest thousand = 9000 (O) · Round 94 to the nearest ten = 90 (H)
Clue 2 (Addition): "WITNESS SAW RIGHT HANDED TRACKS"
1285 + 746 = 2031 (W) · 3666 + 3990 = 7656 (T) · 3932 + 2887 = 6819 (I) · 3896 + 5395 = 9291 (D) · 993 + 1580 = 2573 (K) · 4055 + 2114 = 6169 (G) · 2521 + 1401 = 3922 (N) · 6139 + 2888 = 9027 (C) · 2672 + 5281 = 7953 (H) · 4287 + 3020 = 7307 (A) · 2662 + 3634 = 6296 (E) · 3622 + 2015 = 5637 (S) · 962 + 1305 = 2267 (R)
Clue 3 (Subtraction): "THE BANDIT FLED FROM LOUD WHISTLE"
6436 - 3699 = 2737 (T) · 3497 - 1824 = 1673 (E) · 7658 - 4064 = 3594 (F) · 6036 - 3261 = 2775 (O) · 7855 - 3201 = 4654 (D) · 10342 - 2407 = 7935 (S) · 4484 - 1950 = 2534 (N) · 6262 - 1364 = 4898 (L) · 8996 - 142 = 8854 (A) · 3859 - 393 = 3466 (B) · 9798 - 1889 = 7909 (I) · 4799 - 2742 = 2057 (R) · 6135 - 1382 = 4753 (W) · 3738 - 33 = 3705 (U) · 8588 - 2121 = 6467 (H) · 9835 - 2408 = 7427 (M)
Clue 4 (Multiplication facts (1-12)): "WE FOUND BLONDE BRAID AT THE SCENE"
4 × 11 = 44 (W) · 4 × 8 = 32 (E) · 11 × 3 = 33 (U) · 5 × 5 = 25 (R) · 3 × 8 = 24 (B) · 9 × 1 = 9 (O) · 8 × 7 = 56 (D) · 7 × 2 = 14 (I) · 7 × 10 = 70 (L) · 7 × 4 = 28 (N) · 12 × 12 = 144 (F) · 10 × 10 = 100 (C) · 9 × 12 = 108 (S) · 11 × 2 = 22 (T) · 1 × 6 = 6 (H) · 4 × 10 = 40 (A)
Clue 5 (Division facts (1-12)): surviving statement (box 11) → Liam
48 ÷ 6 = 8 · 2 ÷ 1 = 2 · 5 ÷ 1 = 5 · 144 ÷ 12 = 12 · 7 ÷ 1 = 7 · 7 ÷ 7 = 1 · 6 ÷ 2 = 3 · 90 ÷ 10 = 9 · 70 ÷ 7 = 10 · 42 ÷ 7 = 6 · 32 ÷ 8 = 4

About this mystery

Grade level: Grade 4 math
Math topics: Rounding, Addition, Subtraction, Multiplication, Division
Reading level: grades 1-2
Theme: Mystery at Treehouse Base — set in Jungle Treehouse Base
Format: Interactive online & printable worksheet with answer key
Solution: One unique, verified culprit among 21 suspects

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