Grade 4Reading: grades 3-4RoundingWord problemsBar modelsAdditionDivision
The Mystery of the Sky Fortress
A sneaky Sky Bandit snuck into Cloudtop Haven and took the Golden Compass! Help the Airship Crew crack the clues and catch the intruder.
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 | Gadget | Vehicle | Stance | Scarf Color | Fear |
|---|---|---|---|---|---|
| Captain Barnaby | Sonic Whistle | Sky Skimmer | Left Handed | Crimson Red | Bright Flares |
| Gale Gordon | Grapple Hook | Sky Skimmer | Right Handed | Golden Yellow | Loud Whistles |
| Breeze Bella | Grapple Hook | Wind Hover | Left Handed | Golden Yellow | Bright Flares |
| Rudder Ricky | Glider Wings | Solar Jet | Left Handed | Golden Yellow | Loud Whistles |
| Skye Tracker | Flash Beacon | Wind Hover | Left Handed | Cobalt Blue | Loud Whistles |
| Jet Stream Jim | Flash Beacon | Solar Jet | Right Handed | Cobalt Blue | Bright Flares |
| Radar Ray | Sonic Whistle | Solar Jet | Right Handed | Crimson Red | Loud Whistles |
| Glider Gabe | Grapple Hook | Wind Hover | Left Handed | Cobalt Blue | Bright Flares |
| Stratus Sally | Glider Wings | Sky Skimmer | Left Handed | Cobalt Blue | Bright Flares |
| Flyer Felix | Glider Wings | Sky Skimmer | Right Handed | Crimson Red | Cold Drafts |
| Pilot Paige | Flash Beacon | Sky Skimmer | Right Handed | Golden Yellow | Loud Whistles |
| Stormy Sam | Smoke Bomb | Cloud Rover | Left Handed | Golden Yellow | Loud Whistles |
| Propeller Penny | Glider Wings | Sky Skimmer | Left Handed | Golden Yellow | Loud Whistles |
| Aero Archie | Flash Beacon | Solar Jet | Right Handed | Golden Yellow | Loud Whistles |
| Compass Cora | Smoke Bomb | Sky Skimmer | Right Handed | Cobalt Blue | Loud Whistles |
| Windy Wendy | Smoke Bomb | Aero Bike | Right Handed | Golden Yellow | Loud Whistles |
| Aviator Ava | Smoke Bomb | Solar Jet | Left Handed | Crimson Red | Loud Whistles |
| Navigator Ned | Flash Beacon | Sky Skimmer | Right Handed | Cobalt Blue | Loud Whistles |
| Gusty Grace | Flash Beacon | Wind Hover | Right Handed | Golden Yellow | Loud Whistles |
| Vector Vance | Smoke Bomb | Cloud Rover | Right Handed | Golden Yellow | Cold Drafts |
| Hover Hannah | Glider Wings | Aero Bike | Right Handed | Crimson Red | Bright Flares |
Clue 1
Rounding
We compared the sky bandit logs using bar models to narrow down the gear.
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
1700
2300
30
500
200
200
1300
500
370
2900
130
2300
90
370
130
T
70
7000
90
2300
1300
700
500
370
2900
1700
130
30
2300
170
Round 69 to the nearest tenT
Round 1,271 to the nearest hundredA
Round 128 to the nearest tenO
Round 196 to the nearest hundredL
Round 373 to the nearest tenN
Round 744 to the nearest hundredW
Round 33 to the nearest tenV
Round 90 to the nearest tenS
Round 171 to the nearest tenR
Round 2,886 to the nearest hundredD
Round 7,496 to the nearest thousandU
Round 2,324 to the nearest hundredE
Round 1,707 to the nearest hundredH
Round 479 to the nearest hundredI
0/14 letters found
Clue 2
Word problems
The crew solved cargo word problems to gather clues from the harbor.
Solve each problem to learn its letter, then write the letters in the boxes to fill in the missing word.
Awitnesssawthevillainwas .
R
11
23
49
33
65
33
70
48
D
E
D
There were 45 spyglasses. 34 were used up. How many spyglasses are left?R
There were 58 goggles. 9 were used up. How many goggles are left?G
There were 35 goggles. 12 were used up. How many goggles are left?I
Sky Scout lined up 3 rows of 11 goggles. How many goggles in all?H
Sky Scout lined up 6 rows of 8 goggles. How many goggles in all?N
Sky Scout found 18 spyglasses yesterday and 47 more today. How many spyglasses in all?T
Sky Scout lined up 10 rows of 7 maps. How many maps in all?A
0/7 letters found
Clue 3
Bar model word problems
The altimeter screen only displays rounded cloud heights.
Draw a bar model to solve each word problem. Its answer reveals a letter — write the letters in the boxes to fill in the missing word.
Someonescaredthevillainoffwith .
L
55
139
122
72
86
58
26
S
T
L
55
E
S
Sky Scout has 5 times as many goggles as a teammate. The teammate has 11 goggles. How many goggles does Sky Scout have?
draw a bar model
Answer:→L
The red team has 152 maps and the blue team has 13 maps. How many more maps does the red team have?
draw a bar model
Answer:→O
Sky Scout has 8 times as many compasses as a teammate. The teammate has 9 compasses. How many compasses does Sky Scout have?
draw a bar model
Answer:→D
Sky Scout used 1/2 of the goggles on the first day. The other 43 goggles were used the next day. How many goggles were there in all?
draw a bar model
Answer:→W
There were 30 compasses in all. 4 compasses were used. How many compasses are left?
draw a bar model
Answer:→I
There were 127 lanterns in all. 5 lanterns were used. How many lanterns are left?
draw a bar model
Answer:→U
Sky Scout has 116 lanterns, packed 2 to a bag. How many bags can be filled?
draw a bar model
Answer:→H
0/7 letters found
Clue 4
Addition
We added up all the fuel canisters found near the landing pad.
Solve each problem to learn its letter. Then write that letter in every box that shows the same number, and read the secret clue.
F
2543
2928
6166
6928
8175
3339
6431
2928
3125
8175
3733
6928
2828
3733
3125
3125
2928
6756
3556
6102
3339
8256
F
2543
5260
4727
8256
3733
3339
8175
826 + 1717 =F
2317 + 1239 =S
1605 + 1223 =Y
2647 + 5528 =D
3873 + 3055 =N
3024 + 3732 =W
2471 + 2789 =T
1926 + 1199 =L
4485 + 1946 =G
1517 + 1411 =O
2812 + 3290 =C
1392 + 2341 =E
4170 + 4086 =R
2328 + 2399 =H
2763 + 3403 =U
1967 + 1372 =A
0/16 letters found
Clue 5
Division facts (1-12) — the last clue
The team divided the leftover air maps equally among the scouts.
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
84 ÷ 12 = ?
84 ÷ 7 = ?
24 ÷ 12 = ?
70 ÷ 7 = ?
32 ÷ 4 = ?
11 ÷ 11 = ?
33 ÷ 3 = ?
6 ÷ 2 = ?
25 ÷ 5 = ?
18 ÷ 2 = ?
6 ÷ 1 = ?
Step 2 — cross out the sentence with each answer
1.The villain flew glider wings, then jetted away on a solar jet.
2.The villain lit a flash beacon, then jetted away on a solar jet.
3.The villain dropped a smoke bomb, then drove off in a cloud rover.
4.The villain lit a flash beacon, then escaped on a sky skimmer.
5.The villain blew a sonic whistle, then escaped on a sky skimmer.
6.The villain fired a grapple hook, then sped off on an aero bike.
7.The villain dropped a smoke bomb, then sped off on an aero bike.
8.The villain fired a grapple hook, then zoomed away on a wind hover.
9.The villain blew a sonic whistle, then zoomed away on a wind hover.
10.The villain lit a flash beacon, then zoomed away on a wind hover.
11.The villain lit a flash beacon, then drove off in a cloud rover.
12.The villain fired a grapple hook, then escaped on a sky skimmer.
Solve it
Name the culprit
Choose the one suspect left standing.
Answer Key — The Mystery of the Sky Fortress
Culprit: Pilot Paige (Flash Beacon · Sky Skimmer · Right Handed · Golden Yellow · Loud Whistles)
- Clue 1 (Rounding): "THE VILLAIN DOES NOT USE A WIND HOVER"Round 69 to the nearest ten = 70 (T) · Round 1,271 to the nearest hundred = 1300 (A) · Round 128 to the nearest ten = 130 (O) · Round 196 to the nearest hundred = 200 (L) · Round 373 to the nearest ten = 370 (N) · Round 744 to the nearest hundred = 700 (W) · Round 33 to the nearest ten = 30 (V) · Round 90 to the nearest ten = 90 (S) · Round 171 to the nearest ten = 170 (R) · Round 2,886 to the nearest hundred = 2900 (D) · Round 7,496 to the nearest thousand = 7000 (U) · Round 2,324 to the nearest hundred = 2300 (E) · Round 1,707 to the nearest hundred = 1700 (H) · Round 479 to the nearest hundred = 500 (I)
- Clue 2 (Word problems): "RIGHT HANDED"There were 45 spyglasses. 34 were used up. How many spyglasses are left? = 11 (R) · There were 58 goggles. 9 were used up. How many goggles are left? = 49 (G) · There were 35 goggles. 12 were used up. How many goggles are left? = 23 (I) · Sky Scout lined up 3 rows of 11 goggles. How many goggles in all? = 33 (H) · Sky Scout lined up 6 rows of 8 goggles. How many goggles in all? = 48 (N) · Sky Scout found 18 spyglasses yesterday and 47 more today. How many spyglasses in all? = 65 (T) · Sky Scout lined up 10 rows of 7 maps. How many maps in all? = 70 (A)
- Clue 3 (Bar model word problems): "LOUD WHISTLES"Sky Scout has 5 times as many goggles as a teammate. The teammate has 11 goggles. How many goggles does Sky Scout have? = 55 (L) · The red team has 152 maps and the blue team has 13 maps. How many more maps does the red team have? = 139 (O) · Sky Scout has 8 times as many compasses as a teammate. The teammate has 9 compasses. How many compasses does Sky Scout have? = 72 (D) · Sky Scout used 1/2 of the goggles on the first day. The other 43 goggles were used the next day. How many goggles were there in all? = 86 (W) · There were 30 compasses in all. 4 compasses were used. How many compasses are left? = 26 (I) · There were 127 lanterns in all. 5 lanterns were used. How many lanterns are left? = 122 (U) · Sky Scout has 116 lanterns, packed 2 to a bag. How many bags can be filled? = 58 (H)
- Clue 4 (Addition): "FOUND A GOLDEN YELLOW SCARF THREAD"826 + 1717 = 2543 (F) · 2317 + 1239 = 3556 (S) · 1605 + 1223 = 2828 (Y) · 2647 + 5528 = 8175 (D) · 3873 + 3055 = 6928 (N) · 3024 + 3732 = 6756 (W) · 2471 + 2789 = 5260 (T) · 1926 + 1199 = 3125 (L) · 4485 + 1946 = 6431 (G) · 1517 + 1411 = 2928 (O) · 2812 + 3290 = 6102 (C) · 1392 + 2341 = 3733 (E) · 4170 + 4086 = 8256 (R) · 2328 + 2399 = 4727 (H) · 2763 + 3403 = 6166 (U) · 1967 + 1372 = 3339 (A)
- Clue 5 (Division facts (1-12)): surviving statement (box 4) → Pilot Paige84 ÷ 12 = 7 · 84 ÷ 7 = 12 · 24 ÷ 12 = 2 · 70 ÷ 7 = 10 · 32 ÷ 4 = 8 · 11 ÷ 11 = 1 · 33 ÷ 3 = 11 · 6 ÷ 2 = 3 · 25 ÷ 5 = 5 · 18 ÷ 2 = 9 · 6 ÷ 1 = 6
About this mystery
- Grade level
- Grade 4 math
- Math topics
- Rounding, Word problems, Bar models, Addition, Division
- Reading level
- grades 3-4
- Theme
- The Mystery of the Sky Fortress — set in Cloudtop Haven
- Format
- Interactive online & printable worksheet with answer key
- Solution
- One unique, verified culprit among 21 suspects