Grade 4Reading: grades 3-4RoundingMultiplicationSubtractionAdditionDivision
The Floating Island Heist
A sneaky Sky Pirate has stolen the Golden Compass from the Sky Port! Chief Archivist Barnaby needs your help. Look for clues left in the clouds to track down the thief before they reach the Edge of the World!
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 | Flight Gear | Survival Tool | Goggle Type | Hair Style | Secret Weakness |
|---|---|---|---|---|---|
| Flint Falcon | rocket boots | grappling hook | wears gold goggles | cloud white hair | sneezes at feathers |
| Navigator Ned | jet pack | laser lasso | wears silver goggles | bright blue hair | scared of heights |
| Orbit Owen | rocket boots | net blaster | wears gold goggles | bright blue hair | scared of heights |
| Skybird Susan | propeller cap | net blaster | wears gold goggles | cloud white hair | scared of heights |
| Cloudy Cody | balloon belt | spark wand | wears silver goggles | spiky green hair | scared of heights |
| Breeze Betty | propeller cap | grappling hook | wears silver goggles | spiky green hair | sneezes at feathers |
| Pilot Piper | glider wings | wind fan | wears gold goggles | bright blue hair | tickled by bubbles |
| Aero Alice | jet pack | spark wand | wears silver goggles | spiky green hair | scared of heights |
| Radar Rachel | glider wings | grappling hook | wears gold goggles | spiky green hair | scared of heights |
| Beacon Bob | balloon belt | grappling hook | wears silver goggles | spiky green hair | scared of heights |
| Gale Gabriel | balloon belt | laser lasso | wears gold goggles | cloud white hair | sneezes at feathers |
| Skye High | rocket boots | grappling hook | wears silver goggles | spiky green hair | scared of heights |
| Rusty Rigging | balloon belt | wind fan | wears gold goggles | bright blue hair | tickled by bubbles |
| Altitude Al | propeller cap | wind fan | wears silver goggles | bright blue hair | scared of heights |
| Jet Jackson | glider wings | wind fan | wears silver goggles | cloud white hair | scared of heights |
| Captain Leo | glider wings | wind fan | wears gold goggles | bright blue hair | sneezes at feathers |
| Scout Sally | rocket boots | laser lasso | wears silver goggles | spiky green hair | sneezes at feathers |
| Nova Nellie | rocket boots | net blaster | wears silver goggles | spiky green hair | scared of heights |
| Penny Propeller | propeller cap | spark wand | wears silver goggles | bright blue hair | sneezes at feathers |
| Sunny Sarah | propeller cap | net blaster | wears silver goggles | spiky green hair | scared of heights |
| Windy Wendy | rocket boots | wind fan | wears gold goggles | bright blue hair | tickled by bubbles |
Clue 1
Rounding
The thief's altimeter is broken! It only shows altitude rounded to the nearest ten meters. Let's round these numbers to track their flight path.
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
30
2300
900
T
30
2300
7000
900
1300
300
110
900
130
4300
110
T
30
370
130
900
T
30
2300
900
4300
900
T
30
3000
700
2000
130
T
30
900
70
130
Round 30 to the nearest tenT
Round 718 to the nearest hundredL
Round 68 to the nearest tenR
Round 2,288 to the nearest hundredH
Round 1,257 to the nearest hundredF
Round 2,422 to the nearest thousandA
Round 7,404 to the nearest thousandI
Round 368 to the nearest tenU
Round 112 to the nearest tenO
Round 322 to the nearest hundredD
Round 129 to the nearest tenS
Round 4,342 to the nearest hundredN
Round 913 to the nearest hundredE
Round 3,348 to the nearest thousandB
0/14 letters found
Clue 2
Multiplication facts (1-12)
The Sky Police found rows of supply crates left behind at the docks. If we multiply the rows, we can count the stolen supplies and find a 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.
W
27
16
25
30
18
121
7
44
72
100
11
16
108
2
100
64
44
44
30
121
32
35
16
25
100
30
64
32
72
121
2
7
30
6
99
9 × 3 =W
6 × 3 =U
7 × 5 =H
1 × 7 =D
3 × 10 =O
9 × 12 =R
1 × 2 =G
9 × 8 =I
11 × 11 =N
9 × 11 =K
3 × 2 =C
10 × 10 =L
5 × 5 =F
8 × 8 =A
4 × 8 =T
11 × 4 =S
4 × 4 =E
1 × 11 =V
0/18 letters found
Clue 3
Subtraction
Some fuel was drained from the emergency balloon. Subtract the remaining fuel from the starting amount to see how much they took!
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
6106
5446
2781
7558
3938
5446
8809
8929
2781
6127
2781
1209
5155
5446
2781
7014
5499
3159
3159
4405
8809
7014
8498
1209
3159
5155
7014
7006
T
6106
T
6106
5446
2781
5499
7006
7014
1209
7317 - 1211 =T
10832 - 4705 =R
9853 - 4698 =W
4055 - 117 =S
6716 - 1217 =L
7669 - 4510 =O
11276 - 2467 =I
9896 - 2338 =Y
7520 - 3115 =K
7628 - 2182 =H
9573 - 644 =V
7685 - 4904 =E
11748 - 4734 =N
10322 - 3316 =A
11461 - 2963 =G
2660 - 1451 =D
0/16 letters found
Clue 4
Addition
The harbor master has a list of cargo weights. Add these weights together to find the total load of the getaway ship.
Solve each problem to learn its letter. Then write that letter in every box that shows the same number, and read the secret clue.
S
3791
3401
6438
2883
6002
7347
5206
3138
3138
7173
S
3791
8234
5206
7241
7173
9394
S
3791
5120
3138
5206
3138
7058
7241
8099
7347
7279
8234
6438
7173
8234
7279
3138
7173
3138
8234
2506 + 1285 =S
4000 + 3173 =N
3486 + 4748 =T
3787 + 3454 =A
1799 + 1084 =K
3637 + 3642 =H
3731 + 3327 =C
1032 + 2106 =E
5472 + 3922 =D
2575 + 5524 =U
3507 + 1699 =R
4338 + 2100 =I
1656 + 1745 =P
2368 + 3634 =Y
2247 + 2873 =W
2526 + 4821 =G
0/16 letters found
Clue 5
Division facts (1-12) — the last clue
A box of energy snacks was split equally among the search party. Divide the snacks to see how many each explorer gets to keep up the chase.
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
45 ÷ 9 = ?
22 ÷ 11 = ?
10 ÷ 1 = ?
48 ÷ 12 = ?
49 ÷ 7 = ?
99 ÷ 9 = ?
9 ÷ 1 = ?
54 ÷ 9 = ?
12 ÷ 12 = ?
21 ÷ 7 = ?
72 ÷ 6 = ?
Step 2 — cross out the sentence with each answer
1.The villain zoomed away on rocket boots, then trapped the guard with a net blaster.
2.The villain blasted off with a jet pack, then blinded the cameras with a spark wand.
3.The villain blasted off with a jet pack, then trapped the guard with a net blaster.
4.The villain soared off on glider wings, then grabbed the compass with a laser lasso.
5.The villain zoomed away on rocket boots, then swung away using a grappling hook.
6.The villain soared off on glider wings, then swung away using a grappling hook.
7.The villain soared off on glider wings, then blew away the guards with a wind fan.
8.The villain floated away on a balloon belt, then blinded the cameras with a spark wand.
9.The villain hovered away with a propeller cap, then swung away using a grappling hook.
10.The villain floated away on a balloon belt, then swung away using a grappling hook.
11.The villain zoomed away on rocket boots, then blinded the cameras with a spark wand.
12.The villain blasted off with a jet pack, then swung away using a grappling hook.
Solve it
Name the culprit
Choose the one suspect left standing.
Answer Key — The Floating Island Heist
Culprit: Cloudy Cody (balloon belt · spark wand · wears silver goggles · spiky green hair · scared of heights)
- Clue 1 (Rounding): "THE THIEF DOES NOT USE THE NET BLASTERS"Round 30 to the nearest ten = 30 (T) · Round 718 to the nearest hundred = 700 (L) · Round 68 to the nearest ten = 70 (R) · Round 2,288 to the nearest hundred = 2300 (H) · Round 1,257 to the nearest hundred = 1300 (F) · Round 2,422 to the nearest thousand = 2000 (A) · Round 7,404 to the nearest thousand = 7000 (I) · Round 368 to the nearest ten = 370 (U) · Round 112 to the nearest ten = 110 (O) · Round 322 to the nearest hundred = 300 (D) · Round 129 to the nearest ten = 130 (S) · Round 4,342 to the nearest hundred = 4300 (N) · Round 913 to the nearest hundred = 900 (E) · Round 3,348 to the nearest thousand = 3000 (B)
- Clue 2 (Multiplication facts (1-12)): "WE FOUND SILVER GLASS ON THE FLOATING DOCK"9 × 3 = 27 (W) · 6 × 3 = 18 (U) · 7 × 5 = 35 (H) · 1 × 7 = 7 (D) · 3 × 10 = 30 (O) · 9 × 12 = 108 (R) · 1 × 2 = 2 (G) · 9 × 8 = 72 (I) · 11 × 11 = 121 (N) · 9 × 11 = 99 (K) · 3 × 2 = 6 (C) · 10 × 10 = 100 (L) · 5 × 5 = 25 (F) · 8 × 8 = 64 (A) · 4 × 8 = 32 (T) · 11 × 4 = 44 (S) · 4 × 4 = 16 (E) · 1 × 11 = 11 (V)
- Clue 3 (Subtraction): "THEY SHIVERED WHEN LOOKING DOWN AT THE LAND"7317 - 1211 = 6106 (T) · 10832 - 4705 = 6127 (R) · 9853 - 4698 = 5155 (W) · 4055 - 117 = 3938 (S) · 6716 - 1217 = 5499 (L) · 7669 - 4510 = 3159 (O) · 11276 - 2467 = 8809 (I) · 9896 - 2338 = 7558 (Y) · 7520 - 3115 = 4405 (K) · 7628 - 2182 = 5446 (H) · 9573 - 644 = 8929 (V) · 7685 - 4904 = 2781 (E) · 11748 - 4734 = 7014 (N) · 10322 - 3316 = 7006 (A) · 11461 - 2963 = 8498 (G) · 2660 - 1451 = 1209 (D)
- Clue 4 (Addition): "SPIKY GREEN STRANDS WERE CAUGHT IN THE NET"2506 + 1285 = 3791 (S) · 4000 + 3173 = 7173 (N) · 3486 + 4748 = 8234 (T) · 3787 + 3454 = 7241 (A) · 1799 + 1084 = 2883 (K) · 3637 + 3642 = 7279 (H) · 3731 + 3327 = 7058 (C) · 1032 + 2106 = 3138 (E) · 5472 + 3922 = 9394 (D) · 2575 + 5524 = 8099 (U) · 3507 + 1699 = 5206 (R) · 4338 + 2100 = 6438 (I) · 1656 + 1745 = 3401 (P) · 2368 + 3634 = 6002 (Y) · 2247 + 2873 = 5120 (W) · 2526 + 4821 = 7347 (G)
- Clue 5 (Division facts (1-12)): surviving statement (box 8) → Cloudy Cody45 ÷ 9 = 5 · 22 ÷ 11 = 2 · 10 ÷ 1 = 10 · 48 ÷ 12 = 4 · 49 ÷ 7 = 7 · 99 ÷ 9 = 11 · 9 ÷ 1 = 9 · 54 ÷ 9 = 6 · 12 ÷ 12 = 1 · 21 ÷ 7 = 3 · 72 ÷ 6 = 12
About this mystery
- Grade level
- Grade 4 math
- Math topics
- Rounding, Multiplication, Subtraction, Addition, Division
- Reading level
- grades 3-4
- Theme
- The Floating Island Heist — set in the floating islands of Skylandia
- Format
- Interactive online & printable worksheet with answer key
- Solution
- One unique, verified culprit among 21 suspects