Grade 4Reading: grades 3-4Place valueRoundingAdditionSubtractionDivision

The Great Treehouse Mystery

Someone scrambled the secret maps at the Cosmic Treehouse Headquarters! Head Scout Master Barnaby needs your math skills to decode clues and find the culprit.

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 Gear	Special Item	Dominant Hand	Hair Style	Secret Weakness
Scout Amy	Night Goggles	Secret Map	Left Handed	Curly Hair	Sneeze Powder
Scout Gil	Smoke Bombs	Brass Compass	Right Handed	Spiky Hair	Tickle Feather
Scout Pip	Night Goggles	Signal Flare	Right Handed	Braided Hair	Sneeze Powder
Scout Lou	Night Goggles	Brass Compass	Right Handed	Spiky Hair	Loud Whistle
Scout Mia	Night Goggles	Pocket Radio	Left Handed	Curly Hair	Tickle Feather
Scout Ben	Smoke Bombs	Signal Flare	Right Handed	Braided Hair	Tickle Feather
Scout Max	Smoke Bombs	Pocket Radio	Left Handed	Braided Hair	Tickle Feather
Scout Sam	Jet Boots	Solar Torch	Right Handed	Braided Hair	Tickle Feather
Scout Dan	Night Goggles	Pocket Radio	Right Handed	Braided Hair	Tickle Feather
Scout Kai	Glider Wings	Signal Flare	Left Handed	Spiky Hair	Loud Whistle
Scout Leo	Night Goggles	Solar Torch	Right Handed	Spiky Hair	Tickle Feather
Scout Jay	Glider Wings	Secret Map	Right Handed	Braided Hair	Tickle Feather
Scout Fay	Grappling Hook	Pocket Radio	Left Handed	Braided Hair	Tickle Feather
Scout Eva	Grappling Hook	Secret Map	Left Handed	Braided Hair	Loud Whistle
Scout Zoe	Grappling Hook	Pocket Radio	Right Handed	Spiky Hair	Loud Whistle
Scout Ann	Glider Wings	Pocket Radio	Right Handed	Curly Hair	Tickle Feather
Scout Rex	Jet Boots	Signal Flare	Left Handed	Curly Hair	Sneeze Powder
Scout Ava	Night Goggles	Brass Compass	Right Handed	Curly Hair	Sneeze Powder
Scout Joy	Grappling Hook	Brass Compass	Right Handed	Braided Hair	Loud Whistle
Scout Eli	Grappling Hook	Pocket Radio	Right Handed	Braided Hair	Tickle Feather
Scout Ned	Glider Wings	Secret Map	Left Handed	Spiky Hair	Sneeze Powder

Clue 1

Place value

Scout Master Barnaby checked the place value scanner on the security lock.

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

200

4000

5000

600

6000

300

5000

600

300

200

8000

5000

3000

100

600

700

400

700

500

What is the value of the 2 in 240?T

What is the value of the 3 in 2,318?O

What is the value of the 7 in 670?A

What is the value of the 6 in 8,363?D

What is the value of the 3 in 73,052?I

What is the value of the 6 in 677?N

What is the value of the 1 in 3,174?G

What is the value of the 7 in 764?L

What is the value of the 6 in 36,738?K

What is the value of the 2 in 728?E

What is the value of the 5 in 5,122?S

What is the value of the 4 in 54,673?H

What is the value of the 8 in 68,995?U

What is the value of the 5 in 544?R

What is the value of the 4 in 5,463?F

0/15 letters found

Clue 2

Rounding

The wind meter on the lookout tower rounds all force numbers to the nearest ten.

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

110

500

290

4300

5000

110

2300

230

110

430

7000

500

7000

230

3000

Round 21 to the nearest tenT

Round 4,251 to the nearest hundredK

Round 2,329 to the nearest hundredO

Round 71 to the nearest tenI

Round 482 to the nearest hundredE

Round 88 to the nearest tenR

Round 2,799 to the nearest thousandP

Round 234 to the nearest tenG

Round 4,650 to the nearest thousandS

Round 433 to the nearest tenN

Round 50 to the nearest tenA

Round 30 to the nearest tenW

Round 7,188 to the nearest thousandD

Round 286 to the nearest tenC

Round 109 to the nearest tenH

0/15 letters found

Clue 3

Addition

The team totaled all the missing adventure badges from the supply 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.

2628

9651

3698

2621

2003

8523

4493

6504

4493

2628

9651

4860

4493

3702

4471

9651

2254

2779

4493

9490

9651

4860

4493

4471

9729

4493

2628

2003

1283 + 1345 =A

3727 + 2777 =F

1005 + 998 =K

4635 + 5016 =T

2374 + 1324 =I

1452 + 1327 =P

2135 + 2358 =E

1545 + 1076 =C

4051 + 5439 =D

2396 + 2464 =H

4859 + 4870 =N

2536 + 1166 =R

3348 + 5175 =L

998 + 1256 =O

1991 + 2480 =S

0/15 letters found

Clue 4

Subtraction

The detective calculated the difference in rope lengths left behind.

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

6483

5384

7364

8457

7303

8803

5611

1767

4426

3861

6250

5611

5384

5611

1381

3861

6250

4426

8457

8803

3341

1381

5384

1767

4426

3861

8803

7479

1381

8577 - 2094 =W

10996 - 2539 =O

9399 - 3149 =I

8689 - 1325 =F

12362 - 4883 =C

6001 - 2140 =A

8841 - 3230 =D

4628 - 1287 =T

8217 - 2833 =E

2131 - 364 =B

10583 - 1780 =N

8022 - 3596 =R

5737 - 4356 =H

11615 - 4312 =U

0/14 letters found

Clue 5

Division facts (1-12) — the last clue

The scouts split the snack crackers equally into rescue packs.

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

132 ÷ 11 = ?

40 ÷ 5 = ?

14 ÷ 2 = ?

20 ÷ 2 = ?

60 ÷ 12 = ?

40 ÷ 10 = ?

42 ÷ 7 = ?

21 ÷ 7 = ?

2 ÷ 1 = ?

1 ÷ 1 = ?

45 ÷ 5 = ?

Step 2 — cross out the sentence with each answer

1.The villain vanishes into smoke, then flashes the solar torch.

2.The villain swings between branches, then adjusts the brass compass.

3.The villain vanishes into smoke, then swipes the secret map.

4.The villain scouts in pitch dark, then flashes the solar torch.

5.The villain vanishes into smoke, then adjusts the brass compass.

6.The villain soars across canopy, then tunes the pocket radio.

7.The villain scouts in pitch dark, then tunes the pocket radio.

8.The villain swings between branches, then tunes the pocket radio.

9.The villain swings between branches, then swipes the secret map.

10.The villain zooms over treetop, then adjusts the brass compass.

11.The villain soars across canopy, then swipes the secret map.

12.The villain zooms over treetop, then flashes the solar torch.

Solve it

Name the culprit

Choose the one suspect left standing.

Answer Key — The Great Treehouse Mystery

Culprit: Scout Jay (Glider Wings · Secret Map · Right Handed · Braided Hair · Tickle Feather)

Clue 1 (Place value): "THE SNEAK DOES NOT USE A SIGNAL FLARE"
What is the value of the 2 in 240? = 200 (T) · What is the value of the 3 in 2,318? = 300 (O) · What is the value of the 7 in 670? = 70 (A) · What is the value of the 6 in 8,363? = 60 (D) · What is the value of the 3 in 73,052? = 3000 (I) · What is the value of the 6 in 677? = 600 (N) · What is the value of the 1 in 3,174? = 100 (G) · What is the value of the 7 in 764? = 700 (L) · What is the value of the 6 in 36,738? = 6000 (K) · What is the value of the 2 in 728? = 20 (E) · What is the value of the 5 in 5,122? = 5000 (S) · What is the value of the 4 in 54,673? = 4000 (H) · What is the value of the 8 in 68,995? = 8000 (U) · What is the value of the 5 in 544? = 500 (R) · What is the value of the 4 in 5,463? = 400 (F)
Clue 2 (Rounding): "THE TRACKS SHOW A RIGHT HANDED GRIP"
Round 21 to the nearest ten = 20 (T) · Round 4,251 to the nearest hundred = 4300 (K) · Round 2,329 to the nearest hundred = 2300 (O) · Round 71 to the nearest ten = 70 (I) · Round 482 to the nearest hundred = 500 (E) · Round 88 to the nearest ten = 90 (R) · Round 2,799 to the nearest thousand = 3000 (P) · Round 234 to the nearest ten = 230 (G) · Round 4,650 to the nearest thousand = 5000 (S) · Round 433 to the nearest ten = 430 (N) · Round 50 to the nearest ten = 50 (A) · Round 30 to the nearest ten = 30 (W) · Round 7,188 to the nearest thousand = 7000 (D) · Round 286 to the nearest ten = 290 (C) · Round 109 to the nearest ten = 110 (H)
Clue 3 (Addition): "A TICKLE FEATHER STOPPED THE SNEAK"
1283 + 1345 = 2628 (A) · 3727 + 2777 = 6504 (F) · 1005 + 998 = 2003 (K) · 4635 + 5016 = 9651 (T) · 2374 + 1324 = 3698 (I) · 1452 + 1327 = 2779 (P) · 2135 + 2358 = 4493 (E) · 1545 + 1076 = 2621 (C) · 4051 + 5439 = 9490 (D) · 2396 + 2464 = 4860 (H) · 4859 + 4870 = 9729 (N) · 2536 + 1166 = 3702 (R) · 3348 + 5175 = 8523 (L) · 998 + 1256 = 2254 (O) · 1991 + 2480 = 4471 (S)
Clue 4 (Subtraction): "WE FOUND BRAIDED HAIR ON THE BRANCH"
8577 - 2094 = 6483 (W) · 10996 - 2539 = 8457 (O) · 9399 - 3149 = 6250 (I) · 8689 - 1325 = 7364 (F) · 12362 - 4883 = 7479 (C) · 6001 - 2140 = 3861 (A) · 8841 - 3230 = 5611 (D) · 4628 - 1287 = 3341 (T) · 8217 - 2833 = 5384 (E) · 2131 - 364 = 1767 (B) · 10583 - 1780 = 8803 (N) · 8022 - 3596 = 4426 (R) · 5737 - 4356 = 1381 (H) · 11615 - 4312 = 7303 (U)
Clue 5 (Division facts (1-12)): surviving statement (box 11) → Scout Jay
132 ÷ 11 = 12 · 40 ÷ 5 = 8 · 14 ÷ 2 = 7 · 20 ÷ 2 = 10 · 60 ÷ 12 = 5 · 40 ÷ 10 = 4 · 42 ÷ 7 = 6 · 21 ÷ 7 = 3 · 2 ÷ 1 = 2 · 1 ÷ 1 = 1 · 45 ÷ 5 = 9

About this mystery

Grade level: Grade 4 math
Math topics: Place value, Rounding, Addition, Subtraction, Division
Reading level: grades 3-4
Theme: The Great Treehouse Mystery — set in Cosmic Treehouse Headquarters
Format: Interactive online & printable worksheet with answer key
Solution: One unique, verified culprit among 21 suspects

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