Grade 3Reading: grades 3-4MultiplicationRoundingAdditionSubtractionDivision
The Treehouse Spy Caper
Oh no! Someone broke into the Treehouse HQ and took the legendary Mega-Magnifier gadget! Chief Spark needs your help. Look at the clues, solve the math, and find the rogue agent before they escape!
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 | Spy Gear | Backup Tool | Writing Hand | Disguise Wig | Secret Weakness |
|---|---|---|---|---|---|
| Toby | Jetpack Boots | Smoke Bomb | Right-handed | Bright Orange Wig | Loud Sirens |
| Lola | Sonic Whistle | Smoke Bomb | Left-handed | Bright Orange Wig | Squeaky Toys |
| Ben | Sonic Whistle | Mini Drone | Right-handed | Bright Orange Wig | Loud Sirens |
| Chloe | Grappling Hook | Smoke Bomb | Right-handed | Electric Blue Wig | Loud Sirens |
| Perry | Decoder Glasses | Mini Drone | Right-handed | Neon Green Wig | Squeaky Toys |
| Maya | Laser Watch | Smoke Bomb | Left-handed | Bright Orange Wig | Loud Sirens |
| Natasha | Laser Watch | Sticky Glove | Left-handed | Neon Green Wig | Loud Sirens |
| Carmen | Grappling Hook | Sticky Glove | Right-handed | Bright Orange Wig | Squeaky Toys |
| Cody | Sonic Whistle | Flashlight Glove | Right-handed | Electric Blue Wig | Loud Sirens |
| Kim | Sonic Whistle | Sticky Glove | Left-handed | Electric Blue Wig | Squeaky Toys |
| Sam | Laser Watch | Net Launcher | Right-handed | Bright Orange Wig | Loud Sirens |
| Leo | Sonic Whistle | Flashlight Glove | Right-handed | Electric Blue Wig | Spicy Chips |
| Judy | Jetpack Boots | Mini Drone | Left-handed | Bright Orange Wig | Spicy Chips |
| James | Jetpack Boots | Net Launcher | Right-handed | Bright Orange Wig | Loud Sirens |
| Boris | Grappling Hook | Flashlight Glove | Right-handed | Bright Orange Wig | Loud Sirens |
| Harriet | Jetpack Boots | Sticky Glove | Left-handed | Electric Blue Wig | Squeaky Toys |
| Austin | Decoder Glasses | Mini Drone | Right-handed | Bright Orange Wig | Spicy Chips |
| Sherlock | Jetpack Boots | Flashlight Glove | Right-handed | Bright Orange Wig | Loud Sirens |
| Watson | Jetpack Boots | Sticky Glove | Left-handed | Bright Orange Wig | Squeaky Toys |
| Nancy | Decoder Glasses | Mini Drone | Left-handed | Bright Orange Wig | Loud Sirens |
| Archer | Laser Watch | Smoke Bomb | Right-handed | Bright Orange Wig | Squeaky Toys |
Clue 1
Multiplication facts (1-12)
We need to count the rows of agent badges left on the main desk. They are stored in equal groups.
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
45
63
30
22
16
30
44
2
81
56
30
22
16
56
T
45
25
22
30
44
16
30
T
45
108
44
25
16
49
63
30
55
5 × 9 =T
7 × 7 =C
5 × 5 =U
7 × 8 =O
11 × 4 =A
2 × 8 =N
10 × 3 =E
12 × 9 =L
1 × 2 =K
2 × 11 =S
9 × 9 =D
9 × 7 =H
5 × 11 =R
0/13 letters found
Clue 2
Rounding
The radar screen in the treehouse only shows rounded numbers. We must round the distance to find where the thief ran.
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
5000
200
400
70
4000
70
500
400
300
T
5000
30
2000
8000
T
5000
400
70
40
800
60
700
30
8000
T
5000
200
T
5000
200
400
2000
8000
900
200
T
5000
200
80
800
600
Round 4,502 to the nearest thousandT
Round 39 to the nearest tenO
Round 66 to the nearest tenS
Round 82 to the nearest tenA
Round 221 to the nearest hundredH
Round 638 to the nearest hundredD
Round 56 to the nearest tenL
Round 372 to the nearest hundredE
Round 490 to the nearest hundredP
Round 929 to the nearest hundredG
Round 1,737 to the nearest thousandR
Round 29 to the nearest tenW
Round 4,426 to the nearest thousandU
Round 305 to the nearest hundredC
Round 7,742 to the nearest thousandI
Round 820 to the nearest hundredN
Round 667 to the nearest hundredY
0/17 letters found
Clue 3
Addition
Let us add up the total number of footprints found in the mud near the garden gate.
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
895
245
549
T
895
245
982
549
673
576
354
554
576
530
901
673
354
549
549
901
673
327
547
878
354
547
786
297
901
982
327
549
680
901
476 + 419 =T
416 + 566 =I
223 + 331 =W
181 + 349 =Y
535 + 251 =U
217 + 359 =A
415 + 258 =F
134 + 111 =H
170 + 377 =O
226 + 323 =E
119 + 235 =L
273 + 407 =N
216 + 111 =R
372 + 506 =M
489 + 412 =S
207 + 90 =D
0/16 letters found
Clue 4
Subtraction
Some secret decoder rings are missing from the supply box. Subtract the leftovers to see how many were taken.
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
236
637
622
166
185
242
136
470
622
A
236
338
185
428
370
166
185
742
136
622
A
236
338
558
370
A
236
742
541
428
551
136
637
428
242
166
338
558
237 - 1 =A
540 - 112 =E
360 - 118 =H
549 - 364 =G
229 - 93 =T
593 - 123 =O
322 - 156 =I
472 - 102 =W
873 - 236 =B
1029 - 287 =S
911 - 370 =L
1020 - 398 =R
684 - 133 =F
416 - 78 =N
625 - 67 =D
0/15 letters found
Clue 5
Division facts (1-12) — the last clue
We have a pile of magnifying glasses to share equally among our kid spy teams to finish the search.
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
12 ÷ 1 = ?
99 ÷ 11 = ?
24 ÷ 12 = ?
10 ÷ 1 = ?
5 ÷ 5 = ?
88 ÷ 8 = ?
80 ÷ 10 = ?
30 ÷ 6 = ?
48 ÷ 12 = ?
9 ÷ 3 = ?
56 ÷ 8 = ?
Step 2 — cross out the sentence with each answer
1.The villain distracted the guard dogs with a sonic whistle, then fired a net launcher to trap the robot dog.
2.The villain distracted the guard dogs with a sonic whistle, then flew a mini drone to scout the backyard.
3.The villain zoomed away on jetpack boots over the fence, then climbed the brick wall using a sticky glove.
4.The villain distracted the guard dogs with a sonic whistle, then dropped a smoke bomb to vanish into thin air.
5.The villain distracted the guard dogs with a sonic whistle, then lit up the dark tunnel with a flashlight glove.
6.The villain swung up to the roof with a grappling hook, then lit up the dark tunnel with a flashlight glove.
7.The villain read the secret map with decoder glasses, then climbed the brick wall using a sticky glove.
8.The villain escaped by using a laser watch to cut the door lock, then flew a mini drone to scout the backyard.
9.The villain zoomed away on jetpack boots over the fence, then dropped a smoke bomb to vanish into thin air.
10.The villain swung up to the roof with a grappling hook, then climbed the brick wall using a sticky glove.
11.The villain swung up to the roof with a grappling hook, then flew a mini drone to scout the backyard.
12.The villain zoomed away on jetpack boots over the fence, then lit up the dark tunnel with a flashlight glove.
Solve it
Name the culprit
Choose the one suspect left standing.
Answer Key — The Treehouse Spy Caper
Culprit: Boris (Grappling Hook · Flashlight Glove · Right-handed · Bright Orange Wig · Loud Sirens)
- Clue 1 (Multiplication facts (1-12)): "THE SNEAK DOES NOT USE A NET LAUNCHER"5 × 9 = 45 (T) · 7 × 7 = 49 (C) · 5 × 5 = 25 (U) · 7 × 8 = 56 (O) · 11 × 4 = 44 (A) · 2 × 8 = 16 (N) · 10 × 3 = 30 (E) · 12 × 9 = 108 (L) · 1 × 2 = 2 (K) · 2 × 11 = 22 (S) · 9 × 9 = 81 (D) · 9 × 7 = 63 (H) · 5 × 11 = 55 (R)
- Clue 2 (Rounding): "THE SUSPECT WRITES ONLY WITH THE RIGHT HAND"Round 4,502 to the nearest thousand = 5000 (T) · Round 39 to the nearest ten = 40 (O) · Round 66 to the nearest ten = 70 (S) · Round 82 to the nearest ten = 80 (A) · Round 221 to the nearest hundred = 200 (H) · Round 638 to the nearest hundred = 600 (D) · Round 56 to the nearest ten = 60 (L) · Round 372 to the nearest hundred = 400 (E) · Round 490 to the nearest hundred = 500 (P) · Round 929 to the nearest hundred = 900 (G) · Round 1,737 to the nearest thousand = 2000 (R) · Round 29 to the nearest ten = 30 (W) · Round 4,426 to the nearest thousand = 4000 (U) · Round 305 to the nearest hundred = 300 (C) · Round 7,742 to the nearest thousand = 8000 (I) · Round 820 to the nearest hundred = 800 (N) · Round 667 to the nearest hundred = 700 (Y)
- Clue 3 (Addition): "THE THIEF ALWAYS FLEES FROM LOUD SIRENS"476 + 419 = 895 (T) · 416 + 566 = 982 (I) · 223 + 331 = 554 (W) · 181 + 349 = 530 (Y) · 535 + 251 = 786 (U) · 217 + 359 = 576 (A) · 415 + 258 = 673 (F) · 134 + 111 = 245 (H) · 170 + 377 = 547 (O) · 226 + 323 = 549 (E) · 119 + 235 = 354 (L) · 273 + 407 = 680 (N) · 216 + 111 = 327 (R) · 372 + 506 = 878 (M) · 489 + 412 = 901 (S) · 207 + 90 = 297 (D)
- Clue 4 (Subtraction): "A BRIGHT ORANGE WIG STRAND WAS LEFT BEHIND"237 - 1 = 236 (A) · 540 - 112 = 428 (E) · 360 - 118 = 242 (H) · 549 - 364 = 185 (G) · 229 - 93 = 136 (T) · 593 - 123 = 470 (O) · 322 - 156 = 166 (I) · 472 - 102 = 370 (W) · 873 - 236 = 637 (B) · 1029 - 287 = 742 (S) · 911 - 370 = 541 (L) · 1020 - 398 = 622 (R) · 684 - 133 = 551 (F) · 416 - 78 = 338 (N) · 625 - 67 = 558 (D)
- Clue 5 (Division facts (1-12)): surviving statement (box 6) → Boris12 ÷ 1 = 12 · 99 ÷ 11 = 9 · 24 ÷ 12 = 2 · 10 ÷ 1 = 10 · 5 ÷ 5 = 1 · 88 ÷ 8 = 11 · 80 ÷ 10 = 8 · 30 ÷ 6 = 5 · 48 ÷ 12 = 4 · 9 ÷ 3 = 3 · 56 ÷ 8 = 7
About this mystery
- Grade level
- Grade 3 math
- Math topics
- Multiplication, Rounding, Addition, Subtraction, Division
- Reading level
- grades 3-4
- Theme
- The Treehouse Spy Caper — set in The Secret Treehouse HQ
- Format
- Interactive online & printable worksheet with answer key
- Solution
- One unique, verified culprit among 21 suspects