Grade 4Reading: grades 3-4MultiplicationRoundingAdditionSubtractionDivision

The Secret Treehouse Heist

A sneaky rogue agent has breached the Canopy Heights Spy Treehouse and swiped the Secret Juice Formula! It is up to you, Detective, to follow the clues, use your gadgets, and track down the culprit before the neighborhood sunset.

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	Treehouse Gadget	Secret Decoder Badge	Spy Watch Wrist	Hair Dye Color	Secret Weakness
Sam	Laser Pointer	Amber Badge	Wears watch on left wrist	Electric blue hair	Ticklish toes
Waldo	Pocket Drone	Amber Badge	Wears watch on right wrist	Electric blue hair	Allergic to pollen
Ben	Pocket Drone	Cobalt Badge	Wears watch on left wrist	Neon green hair	Scared of spiders
Chase	Slime Launcher	Cobalt Badge	Wears watch on left wrist	Neon green hair	Scared of spiders
Skye	Pocket Drone	Cobalt Badge	Wears watch on right wrist	Electric blue hair	Scared of spiders
Tara	Laser Pointer	Cobalt Badge	Wears watch on left wrist	Electric blue hair	Ticklish toes
Jake	Rocket Boots	Amber Badge	Wears watch on right wrist	Electric blue hair	Allergic to pollen
Danny	Rocket Boots	Emerald Badge	Wears watch on left wrist	Bright orange hair	Scared of spiders
Cody	Pocket Drone	Amber Badge	Wears watch on left wrist	Neon green hair	Ticklish toes
Jerry	Grapple Hook	Emerald Badge	Wears watch on left wrist	Bright orange hair	Ticklish toes
Perry	Rocket Boots	Onyx Badge	Wears watch on left wrist	Bright orange hair	Scared of spiders
Leo	Slime Launcher	Cobalt Badge	Wears watch on right wrist	Bright orange hair	Allergic to pollen
Penny	Pocket Drone	Emerald Badge	Wears watch on left wrist	Neon green hair	Ticklish toes
Kim	Grapple Hook	Emerald Badge	Wears watch on right wrist	Neon green hair	Scared of spiders
Clover	Grapple Hook	Cobalt Badge	Wears watch on left wrist	Neon green hair	Scared of spiders
Zack	Laser Pointer	Onyx Badge	Wears watch on right wrist	Electric blue hair	Ticklish toes
Ivy	Laser Pointer	Cobalt Badge	Wears watch on right wrist	Bright orange hair	Allergic to pollen
Ryder	Grapple Hook	Ruby Badge	Wears watch on left wrist	Neon green hair	Scared of spiders
Gwen	Laser Pointer	Emerald Badge	Wears watch on right wrist	Electric blue hair	Scared of spiders
Tucker	Slime Launcher	Onyx Badge	Wears watch on right wrist	Electric blue hair	Scared of spiders
Ron	Laser Pointer	Cobalt Badge	Wears watch on left wrist	Neon green hair	Scared of spiders

Clue 1

Multiplication facts (1-12)

Agent Max finds rows of empty gadget crates left behind. Let's count how many total spy badges are missing by multiplying the neat rows of boxes.

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

120

9 × 10 =T

2 × 7 =S

1 × 10 =E

8 × 12 =L

7 × 1 =V

7 × 11 =H

5 × 11 =Y

9 × 7 =I

1 × 1 =G

12 × 10 =R

10 × 5 =A

4 × 11 =U

10 × 10 =N

4 × 10 =B

8 × 8 =D

3 × 5 =O

0/16 letters found

Clue 2

Rounding

The treehouse security scanner is a bit glitchy and only displays rounded numbers on its radar screen. We must round the energy signals to read the tracking data.

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

370

230

5000

2000

1300

2300

5000

3000

230

430

5000

9000

170

500

3700

2000

230

9000

1100

5000

9000

170

Round 167 to the nearest hundredL

Round 17 to the nearest tenE

Round 8,967 to the nearest thousandR

Round 172 to the nearest tenK

Round 1,302 to the nearest hundredD

Round 432 to the nearest tenM

Round 3,326 to the nearest thousandC

Round 1,148 to the nearest hundredB

Round 2,336 to the nearest hundredW

Round 470 to the nearest hundredS

Round 3,749 to the nearest hundredO

Round 2,470 to the nearest thousandN

Round 31 to the nearest tenT

Round 5,430 to the nearest thousandA

Round 233 to the nearest tenH

Round 370 to the nearest tenF

0/16 letters found

Clue 3

Addition

We gather the dropped flashlight batteries from the escape tunnel. Let's tally them all up by adding the piles together to see how far the rogue went.

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

9043

9494

8736

9494

3015

9494

8099

8496

9043

6787

5104

9494

6583

5439

8736

8099

4558

2444

5439

4324

2802

9043

3015

2802

4049

6230 + 2813 =R

6324 + 3170 =A

5045 + 3054 =Y

2930 + 1394 =D

809 + 1635 =P

2830 + 5906 =N

1750 + 1052 =E

2878 + 2561 =I

2456 + 4331 =O

3166 + 1938 =M

1426 + 1589 =W

3365 + 3218 =T

2820 + 1738 =S

1742 + 2307 =B

5635 + 2861 =F

0/15 letters found

Clue 4

Subtraction

The gadget vault is missing some gear. We take our total inventory and subtract the leftover tools to find out exactly how many items the thief grabbed.

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

8047

6666

4261

8047

1544

4224

6666

8047

6280

2954

4224

7292

8047

2693

6280

1944

6666

6965

2954

4261

8047

2954

3931

6666

3338

4224

7292

8047

1960

3931

9841 - 1794 =N

5998 - 1774 =R

6739 - 4795 =L

8298 - 1333 =F

4431 - 500 =H

10419 - 3127 =A

7495 - 4802 =D

8765 - 2099 =E

5731 - 1470 =O

4101 - 2557 =G

4189 - 1235 =T

5743 - 2405 =B

8395 - 2115 =S

4786 - 2826 =C

0/14 letters found

Clue 5

Division facts (1-12) — the last clue

To cover the search area quickly, we must divide our patrol squad evenly among the treehouse rope bridges to narrow down the final hideout.

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

10 ÷ 10 = ?

64 ÷ 8 = ?

81 ÷ 9 = ?

40 ÷ 8 = ?

84 ÷ 7 = ?

55 ÷ 5 = ?

2 ÷ 1 = ?

28 ÷ 7 = ?

36 ÷ 12 = ?

24 ÷ 4 = ?

40 ÷ 4 = ?

Step 2 — cross out the sentence with each answer

1.The villain swiped the golden compass, then climbed down the rope ladder.

2.The villain took the mega battery, then climbed down the rope ladder.

3.The villain swiped the golden compass, then bounced off the trampoline.

4.The villain swiped the golden compass, then scrambled over the fence.

5.The villain swiped the golden compass, then jumped into the bushes.

6.The villain snatched the secret map, then scrambled over the fence.

7.The villain grabbed the master key, then climbed down the rope ladder.

8.The villain stole the decoder ring, then climbed down the rope ladder.

9.The villain snatched the secret map, then climbed down the rope ladder.

10.The villain took the mega battery, then scrambled over the fence.

11.The villain took the mega battery, then bounced off the trampoline.

12.The villain grabbed the master key, then zipped down the escape line.

Solve it

Name the culprit

Choose the one suspect left standing.

Answer Key — The Secret Treehouse Heist

Culprit: Ben (Pocket Drone · Cobalt Badge · Wears watch on left wrist · Neon green hair · Scared of spiders)

Clue 1 (Multiplication facts (1-12)): "THE VILLAIN DOES NOT HAVE THE RUBY BADGE"
9 × 10 = 90 (T) · 2 × 7 = 14 (S) · 1 × 10 = 10 (E) · 8 × 12 = 96 (L) · 7 × 1 = 7 (V) · 7 × 11 = 77 (H) · 5 × 11 = 55 (Y) · 9 × 7 = 63 (I) · 1 × 1 = 1 (G) · 12 × 10 = 120 (R) · 10 × 5 = 50 (A) · 4 × 11 = 44 (U) · 10 × 10 = 100 (N) · 4 × 10 = 40 (B) · 8 × 8 = 64 (D) · 3 × 5 = 15 (O)
Clue 2 (Rounding): "LEFT HANDED WATCH MARKS ON THE TREE BARK"
Round 167 to the nearest hundred = 200 (L) · Round 17 to the nearest ten = 20 (E) · Round 8,967 to the nearest thousand = 9000 (R) · Round 172 to the nearest ten = 170 (K) · Round 1,302 to the nearest hundred = 1300 (D) · Round 432 to the nearest ten = 430 (M) · Round 3,326 to the nearest thousand = 3000 (C) · Round 1,148 to the nearest hundred = 1100 (B) · Round 2,336 to the nearest hundred = 2300 (W) · Round 470 to the nearest hundred = 500 (S) · Round 3,749 to the nearest hundred = 3700 (O) · Round 2,470 to the nearest thousand = 2000 (N) · Round 31 to the nearest ten = 30 (T) · Round 5,430 to the nearest thousand = 5000 (A) · Round 233 to the nearest ten = 230 (H) · Round 370 to the nearest ten = 370 (F)
Clue 3 (Addition): "RAN AWAY FROM A TINY SPIDER WEB"
6230 + 2813 = 9043 (R) · 6324 + 3170 = 9494 (A) · 5045 + 3054 = 8099 (Y) · 2930 + 1394 = 4324 (D) · 809 + 1635 = 2444 (P) · 2830 + 5906 = 8736 (N) · 1750 + 1052 = 2802 (E) · 2878 + 2561 = 5439 (I) · 2456 + 4331 = 6787 (O) · 3166 + 1938 = 5104 (M) · 1426 + 1589 = 3015 (W) · 3365 + 3218 = 6583 (T) · 2820 + 1738 = 4558 (S) · 1742 + 2307 = 4049 (B) · 5635 + 2861 = 8496 (F)
Clue 4 (Subtraction): "NEON GREEN STRANDS LEFT ON THE BRANCH"
9841 - 1794 = 8047 (N) · 5998 - 1774 = 4224 (R) · 6739 - 4795 = 1944 (L) · 8298 - 1333 = 6965 (F) · 4431 - 500 = 3931 (H) · 10419 - 3127 = 7292 (A) · 7495 - 4802 = 2693 (D) · 8765 - 2099 = 6666 (E) · 5731 - 1470 = 4261 (O) · 4101 - 2557 = 1544 (G) · 4189 - 1235 = 2954 (T) · 5743 - 2405 = 3338 (B) · 8395 - 2115 = 6280 (S) · 4786 - 2826 = 1960 (C)
Clue 5 (Division facts (1-12)): surviving statement (box 7) → Ben
10 ÷ 10 = 1 · 64 ÷ 8 = 8 · 81 ÷ 9 = 9 · 40 ÷ 8 = 5 · 84 ÷ 7 = 12 · 55 ÷ 5 = 11 · 2 ÷ 1 = 2 · 28 ÷ 7 = 4 · 36 ÷ 12 = 3 · 24 ÷ 4 = 6 · 40 ÷ 4 = 10

About this mystery

Grade level: Grade 4 math
Math topics: Multiplication, Rounding, Addition, Subtraction, Division
Reading level: grades 3-4
Theme: The Secret Treehouse Heist — set in The Canopy Heights Spy Treehouse
Format: Interactive online & printable worksheet with answer key
Solution: One unique, verified culprit among 21 suspects

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