The Secret Treehouse Mystery
The Golden Juice Box has vanished from the Secret Treehouse Spy Club! The Midnight Prankster snuck past our backyard laser security system and left a trail of crumbs. Grab your spy gear and help us solve the case!
Possible suspects
Cross off a row as each clue rules it out. On screen, tap a row.
| Name | Spy Gear | Disguise Kit | Dominant Hand | Hair Color | Silly Fear |
|---|---|---|---|---|---|
| Ruby | Laser Pointer | Fake Cast | Left-handed | Brown Hair | Ticklish Feet |
| Luke | Pocket Drone | Wig and Hat | Left-handed | Brown Hair | Sneeze Powder |
| Noah | Super Snorkel | Detective Coat | Left-handed | Blonde Hair | Sneeze Powder |
| Maya | Pocket Drone | Wig and Hat | Right-handed | Blonde Hair | Ticklish Feet |
| Abby | Super Snorkel | Detective Coat | Right-handed | Blonde Hair | Ticklish Feet |
| Liam | Night Goggles | Clown Nose | Left-handed | Brown Hair | Sneeze Powder |
| Cole | Pocket Drone | Wig and Hat | Right-handed | Brown Hair | Sneeze Powder |
| Toby | Laser Pointer | Clown Nose | Left-handed | Red Hair | Hopping Frogs |
| Mia | Grappling Hook | Wig and Hat | Left-handed | Blonde Hair | Ticklish Feet |
| Max | Night Goggles | Mustache Glasses | Right-handed | Brown Hair | Sneeze Powder |
| Emma | Grappling Hook | Wig and Hat | Left-handed | Brown Hair | Ticklish Feet |
| Ella | Laser Pointer | Detective Coat | Left-handed | Red Hair | Ticklish Feet |
| Owen | Grappling Hook | Detective Coat | Left-handed | Brown Hair | Sneeze Powder |
| Alex | Grappling Hook | Fake Cast | Left-handed | Brown Hair | Sneeze Powder |
| Jack | Laser Pointer | Clown Nose | Left-handed | Red Hair | Ticklish Feet |
| Sam | Super Snorkel | Clown Nose | Left-handed | Brown Hair | Ticklish Feet |
| Lily | Laser Pointer | Mustache Glasses | Left-handed | Brown Hair | Sneeze Powder |
| Finn | Laser Pointer | Wig and Hat | Right-handed | Brown Hair | Hopping Frogs |
| Leo | Super Snorkel | Clown Nose | Right-handed | Brown Hair | Sneeze Powder |
| Ryan | Night Goggles | Detective Coat | Right-handed | Red Hair | Sneeze Powder |
| Zoe | Night Goggles | Wig and Hat | Left-handed | Red Hair | Sneeze Powder |
Rounding
We found a muddy boot print near the base of the oak tree. The distance meter on our radar only gives rounded numbers, so we need to estimate the exact spot 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.
Addition
We searched the garden bushes and found some dropped walkie talkies. We need to add up all the units we collected to see if we found them all.
Solve each problem to learn its letter. Then write that letter in every box that shows the same number, and read the secret clue.
Subtraction
The prankster raided our secret stash of club snacks. If we subtract the empty wrappers from our total supply, we can see exactly how much they ate.
Solve each problem to learn its letter. Then write that letter in every box that shows the same number, and read the secret clue.
Multiplication facts (1-12)
We found several rows of suspicious muddy footprints leading to the fence. If we multiply the number of rows by the prints in each row, we can map the escape route.
Solve each problem to learn its letter. Then write that letter in every box that shows the same number, and read the secret clue.
Division facts (1-12) — the last clue
We need to divide our detective squad into equal teams to search the neighborhood. Sharing the map pieces evenly will help us pinpoint the prankster.
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!
Name the culprit
Choose the one suspect left standing.
Answer Key — The Secret Treehouse Mystery
- Clue 1 (Rounding): "THE VILLAIN DOES NOT WEAR A WIG AND HAT"Round 3,705 to the nearest hundred = 3700 (T) · Round 1,712 to the nearest hundred = 1700 (I) · Round 32 to the nearest ten = 30 (E) · Round 889 to the nearest hundred = 900 (O) · Round 173 to the nearest ten = 170 (W) · Round 4,334 to the nearest hundred = 4300 (G) · Round 2,759 to the nearest thousand = 3000 (N) · Round 48 to the nearest ten = 50 (R) · Round 303 to the nearest hundred = 300 (A) · Round 374 to the nearest ten = 370 (D) · Round 1,088 to the nearest hundred = 1100 (V) · Round 72 to the nearest ten = 70 (L) · Round 87 to the nearest ten = 90 (H) · Round 289 to the nearest ten = 290 (S)
- Clue 2 (Addition): "THE SUSPECT USES THEIR LEFT HAND"3670 + 4170 = 7840 (T) · 2096 + 3043 = 5139 (H) · 1466 + 2409 = 3875 (C) · 3244 + 5280 = 8524 (N) · 1986 + 2684 = 4670 (I) · 5402 + 2630 = 8032 (U) · 2129 + 2611 = 4740 (D) · 3999 + 4967 = 8966 (E) · 6790 + 2976 = 9766 (L) · 4121 + 3549 = 7670 (S) · 2217 + 1540 = 3757 (P) · 2761 + 4332 = 7093 (F) · 4344 + 2139 = 6483 (R) · 1520 + 2432 = 3952 (A)
- Clue 3 (Subtraction): "THE VILLAIN SNEEZES NEAR BLACK PEPPER"9718 - 4161 = 5557 (T) · 6052 - 1381 = 4671 (Z) · 7755 - 2911 = 4844 (E) · 8445 - 2142 = 6303 (K) · 9975 - 1976 = 7999 (H) · 10374 - 3981 = 6393 (B) · 13526 - 4675 = 8851 (A) · 10564 - 1666 = 8898 (S) · 2930 - 1873 = 1057 (C) · 6231 - 539 = 5692 (L) · 7492 - 1926 = 5566 (V) · 11094 - 3397 = 7697 (I) · 3985 - 1491 = 2494 (R) · 4666 - 79 = 4587 (P) · 3421 - 1819 = 1602 (N)
- Clue 4 (Multiplication facts (1-12)): "BROWN STRANDS OF HAIR WERE ON THE ROPE"11 × 12 = 132 (B) · 8 × 4 = 32 (W) · 3 × 2 = 6 (A) · 9 × 12 = 108 (F) · 1 × 1 = 1 (E) · 9 × 8 = 72 (I) · 9 × 10 = 90 (H) · 11 × 2 = 22 (P) · 7 × 5 = 35 (S) · 4 × 11 = 44 (T) · 6 × 10 = 60 (O) · 1 × 11 = 11 (N) · 6 × 5 = 30 (D) · 4 × 10 = 40 (R)
- Clue 5 (Division facts (1-12)): surviving statement (box 2) → Owen10 ÷ 2 = 5 · 45 ÷ 5 = 9 · 88 ÷ 8 = 11 · 80 ÷ 8 = 10 · 56 ÷ 7 = 8 · 77 ÷ 11 = 7 · 12 ÷ 4 = 3 · 36 ÷ 6 = 6 · 40 ÷ 10 = 4 · 84 ÷ 7 = 12 · 12 ÷ 12 = 1
About this mystery
- Grade level
- Grade 4 math
- Math topics
- Rounding, Addition, Subtraction, Multiplication, Division
- Reading level
- grades 3-4
- Theme
- The Secret Treehouse Mystery — set in The Whispering Woods and the Backyard Clubhouses
- Format
- Interactive online & printable worksheet with answer key
- Solution
- One unique, verified culprit among 21 suspects