Grade 3Reading: grades 1-2MultiplicationRoundingAdditionSubtractionDivision
The Mystery of the Treehouse Compass
Someone hid the golden camp compass in the Whispering Woods! Solve the clues to help the scout team find the culprit and recover the compass.
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 | Adventurer Gear | Scout Badge | Stance | Cap Color | Camp Fear |
|---|---|---|---|---|---|
| Nora | Canteen | Wildlife Badge | Left Handed | Green Cap | Mud Puddles |
| Ava | Binoculars | Trail Badge | Right Handed | Red Cap | Dark Caves |
| Eli | Compass | Map Badge | Right Handed | Green Cap | Mud Puddles |
| Sadie | Canteen | Wildlife Badge | Right Handed | Green Cap | Mud Puddles |
| Lily | Compass | Wildlife Badge | Left Handed | Green Cap | Mud Puddles |
| Jack | Binoculars | Knot Badge | Left Handed | Blue Cap | Mud Puddles |
| Chloe | Flashlight | Map Badge | Left Handed | Blue Cap | Mud Puddles |
| Clara | Flashlight | Wildlife Badge | Right Handed | Blue Cap | Buzzing Bees |
| Ivy | Flashlight | Fire Badge | Right Handed | Green Cap | Dark Caves |
| Sam | Flashlight | Wildlife Badge | Right Handed | Red Cap | Mud Puddles |
| Noah | Canteen | Trail Badge | Right Handed | Green Cap | Mud Puddles |
| Ruby | Flashlight | Map Badge | Right Handed | Green Cap | Mud Puddles |
| Zoe | Flashlight | Knot Badge | Right Handed | Green Cap | Mud Puddles |
| Toby | Canteen | Trail Badge | Left Handed | Red Cap | Dark Caves |
| Maya | Canteen | Trail Badge | Right Handed | Green Cap | Dark Caves |
| Ella | Flashlight | Wildlife Badge | Left Handed | Green Cap | Mud Puddles |
| Cole | Rope | Knot Badge | Left Handed | Blue Cap | Mud Puddles |
| Owen | Compass | Trail Badge | Left Handed | Green Cap | Dark Caves |
| Luke | Binoculars | Trail Badge | Right Handed | Blue Cap | Mud Puddles |
| Ben | Compass | Trail Badge | Right Handed | Red Cap | Dark Caves |
| Leo | Rope | Wildlife Badge | Left Handed | Blue Cap | Dark Caves |
Clue 1
Multiplication facts (1-12)
We found rows of tents set up in the woods. Solve this math to count 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.
T
70
9
18
66
63
96
96
28
63
36
3
30
18
88
36
30
T
70
9
28
66
18
T
70
9
18
44
36
30
T
70
55
28
3
121
18
10 × 7 =T
3 × 1 =D
11 × 6 =V
12 × 8 =L
7 × 9 =I
4 × 11 =K
8 × 11 =S
6 × 6 =N
11 × 11 =G
1 × 9 =H
9 × 2 =E
6 × 5 =O
11 × 5 =B
4 × 7 =A
0/14 letters found
Clue 2
Rounding
The scout radio screen rounds numbers up or down. Solve this math to read it clearly!
Solve each problem to learn its letter. Then write that letter in every box that shows the same number, and read the secret clue.
A
200
8000
40
2000
500
4000
50
50
50
A
200
8000
A
200
5000
40
80
20
2000
20
A
200
500
9000
4000
9000
2000
5000
A
200
3000
400
Round 199 to the nearest hundredA
Round 40 to the nearest tenI
Round 9,135 to the nearest thousandD
Round 48 to the nearest tenS
Round 7,847 to the nearest thousandW
Round 442 to the nearest hundredK
Round 4,621 to the nearest thousandR
Round 81 to the nearest tenG
Round 1,588 to the nearest thousandT
Round 3,395 to the nearest thousandC
Round 17 to the nearest tenH
Round 4,193 to the nearest thousandE
Round 457 to the nearest hundredN
0/13 letters found
Clue 3
Addition
The campers gathered all their trail snacks together. Solve this math to find the total!
Solve each problem to learn its letter. Then write that letter in every box that shows the same number, and read the secret clue.
T
420
549
412
266
261
324
391
716
948
T
420
574
616
412
412
490
412
252
616
412
724
716
920
261
252
391
261
252
252
324
412
574
215 + 205 =T
351 + 223 =S
173 + 88 =U
319 + 230 =H
221 + 191 =E
310 + 406 =R
134 + 257 =P
311 + 637 =I
116 + 150 =C
130 + 122 =D
108 + 216 =L
278 + 446 =A
260 + 356 =N
538 + 382 =M
208 + 282 =Z
0/15 letters found
Clue 4
Subtraction
Some pine cones rolled off the picnic table. Solve this math to see how many remain!
Solve each problem to learn its letter. Then write that letter in every box that shows the same number, and read the secret clue.
A
356
520
713
831
831
465
104
A
356
125
444
A
356
674
877
831
307
260
465
831
A
356
713
260
836
831
700
A
356
125
579 - 223 =A
272 - 147 =P
840 - 4 =H
704 - 260 =W
426 - 119 =F
286 - 182 =C
767 - 247 =G
1083 - 383 =M
747 - 34 =R
1105 - 228 =L
735 - 61 =S
418 - 158 =T
1066 - 235 =E
468 - 3 =N
0/14 letters found
Clue 5
Division facts (1-12) — the last clue
We need to share flashlight batteries equally among groups. Solve this math to divide them!
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
110 ÷ 10 = ?
88 ÷ 11 = ?
84 ÷ 7 = ?
30 ÷ 3 = ?
21 ÷ 3 = ?
12 ÷ 6 = ?
30 ÷ 10 = ?
44 ÷ 11 = ?
10 ÷ 2 = ?
2 ÷ 2 = ?
12 ÷ 2 = ?
Step 2 — cross out the sentence with each answer
1.The villain uses a compass, then shows the trail badge.
2.The villain peeks through binoculars, then shows the trail badge.
3.The villain swings a rope, then shows the trail badge.
4.The villain swings a rope, then shows the wildlife badge.
5.The villain drinks from a canteen, then shows the fire badge.
6.The villain shines a flashlight, then shows the knot badge.
7.The villain uses a compass, then shows the wildlife badge.
8.The villain shines a flashlight, then shows the map badge.
9.The villain uses a compass, then shows the map badge.
10.The villain swings a rope, then shows the map badge.
11.The villain drinks from a canteen, then shows the trail badge.
12.The villain drinks from a canteen, then shows the wildlife badge.
Solve it
Name the culprit
Choose the one suspect left standing.
Answer Key — The Mystery of the Treehouse Compass
Culprit: Eli (Compass · Map Badge · Right Handed · Green Cap · Mud Puddles)
- Clue 1 (Multiplication facts (1-12)): "THE VILLAIN DOES NOT HAVE THE KNOT BADGE"10 × 7 = 70 (T) · 3 × 1 = 3 (D) · 11 × 6 = 66 (V) · 12 × 8 = 96 (L) · 7 × 9 = 63 (I) · 4 × 11 = 44 (K) · 8 × 11 = 88 (S) · 6 × 6 = 36 (N) · 11 × 11 = 121 (G) · 1 × 9 = 9 (H) · 9 × 2 = 18 (E) · 6 × 5 = 30 (O) · 11 × 5 = 55 (B) · 4 × 7 = 28 (A)
- Clue 2 (Rounding): "A WITNESS SAW A RIGHT HANDED TRACK"Round 199 to the nearest hundred = 200 (A) · Round 40 to the nearest ten = 40 (I) · Round 9,135 to the nearest thousand = 9000 (D) · Round 48 to the nearest ten = 50 (S) · Round 7,847 to the nearest thousand = 8000 (W) · Round 442 to the nearest hundred = 400 (K) · Round 4,621 to the nearest thousand = 5000 (R) · Round 81 to the nearest ten = 80 (G) · Round 1,588 to the nearest thousand = 2000 (T) · Round 3,395 to the nearest thousand = 3000 (C) · Round 17 to the nearest ten = 20 (H) · Round 4,193 to the nearest thousand = 4000 (E) · Round 457 to the nearest hundred = 500 (N)
- Clue 3 (Addition): "THE CULPRIT SNEEZED NEAR MUD PUDDLES"215 + 205 = 420 (T) · 351 + 223 = 574 (S) · 173 + 88 = 261 (U) · 319 + 230 = 549 (H) · 221 + 191 = 412 (E) · 310 + 406 = 716 (R) · 134 + 257 = 391 (P) · 311 + 637 = 948 (I) · 116 + 150 = 266 (C) · 130 + 122 = 252 (D) · 108 + 216 = 324 (L) · 278 + 446 = 724 (A) · 260 + 356 = 616 (N) · 538 + 382 = 920 (M) · 208 + 282 = 490 (Z)
- Clue 4 (Subtraction): "A GREEN CAP WAS LEFT NEAR THE MAP"579 - 223 = 356 (A) · 272 - 147 = 125 (P) · 840 - 4 = 836 (H) · 704 - 260 = 444 (W) · 426 - 119 = 307 (F) · 286 - 182 = 104 (C) · 767 - 247 = 520 (G) · 1083 - 383 = 700 (M) · 747 - 34 = 713 (R) · 1105 - 228 = 877 (L) · 735 - 61 = 674 (S) · 418 - 158 = 260 (T) · 1066 - 235 = 831 (E) · 468 - 3 = 465 (N)
- Clue 5 (Division facts (1-12)): surviving statement (box 9) → Eli110 ÷ 10 = 11 · 88 ÷ 11 = 8 · 84 ÷ 7 = 12 · 30 ÷ 3 = 10 · 21 ÷ 3 = 7 · 12 ÷ 6 = 2 · 30 ÷ 10 = 3 · 44 ÷ 11 = 4 · 10 ÷ 2 = 5 · 2 ÷ 2 = 1 · 12 ÷ 2 = 6
About this mystery
- Grade level
- Grade 3 math
- Math topics
- Multiplication, Rounding, Addition, Subtraction, Division
- Reading level
- grades 1-2
- Theme
- The Mystery of the Treehouse Compass — set in Whispering Woods Camp
- Format
- Interactive online & printable worksheet with answer key
- Solution
- One unique, verified culprit among 21 suspects