Grade 4Reading: grades 3-4Place valueRoundingAdditionSubtractionDivision
The Cloud Haven Compass Heist
A rogue airship captain has swiped the Golden Compass! Without it, our ships will get lost in the heavy storm clouds. It is up to you to track down the thief and save the day.
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 | Airship Gear | Sky Gadget | Steering Hand | Hat Color | Favorite Snack |
|---|---|---|---|---|---|
| Captain Cabot | cloud anchor | map decoder | right handed steering | brown leather cap | crunchy sky apples |
| Captain Morgan | wind glider | pocket sundial | right handed steering | red bandana | sweet honey biscuits |
| Captain Polo | steam booster | mini compass | left handed steering | blue tricorn hat | sweet honey biscuits |
| Captain Hudson | cloud anchor | storm whistle | left handed steering | red bandana | sweet honey biscuits |
| Captain Zheng | grappling hook | mini compass | left handed steering | red bandana | sweet honey biscuits |
| Captain Erikson | brass spyglass | spark lantern | left handed steering | red bandana | sweet honey biscuits |
| Captain Raleigh | wind glider | map decoder | left handed steering | brown leather cap | crunchy sky apples |
| Captain Balboa | grappling hook | pocket sundial | right handed steering | red bandana | sweet honey biscuits |
| Captain Magellan | brass spyglass | pocket sundial | right handed steering | brown leather cap | crunchy sky apples |
| Captain Bonny | steam booster | storm whistle | left handed steering | red bandana | crunchy sky apples |
| Captain Cook | grappling hook | map decoder | right handed steering | blue tricorn hat | salty dried kelp |
| Captain Barnaby | grappling hook | mini compass | right handed steering | red bandana | salty dried kelp |
| Captain Lewis | cloud anchor | spark lantern | right handed steering | blue tricorn hat | crunchy sky apples |
| Captain Peary | steam booster | mini compass | left handed steering | red bandana | crunchy sky apples |
| Captain Cartier | grappling hook | pocket sundial | right handed steering | blue tricorn hat | crunchy sky apples |
| Captain Drake | cloud anchor | spark lantern | left handed steering | blue tricorn hat | sweet honey biscuits |
| Captain Clark | cloud anchor | mini compass | right handed steering | red bandana | salty dried kelp |
| Captain Avery | brass spyglass | mini compass | left handed steering | red bandana | sweet honey biscuits |
| Captain Kidd | cloud anchor | mini compass | right handed steering | red bandana | crunchy sky apples |
| Captain De Soto | grappling hook | spark lantern | left handed steering | red bandana | sweet honey biscuits |
| Captain Tasman | steam booster | storm whistle | left handed steering | blue tricorn hat | crunchy sky apples |
Clue 1
Place value
To unlock the cabin door, we must enter a code. The keypad uses place value clues to reveal the secret numbers.
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
60
6000
500
900
500
3000
6000
200
T
70
9000
4000
6000
500
600
4000
T
70
900
500
6000
30
500
T
70
4000
7000
10
300
60
50
500
T
70
90
6000
What is the value of the 7 in 470?T
What is the value of the 3 in 3,000?P
What is the value of the 6 in 681?N
What is the value of the 6 in 46,554?E
What is the value of the 3 in 536?A
What is the value of the 7 in 7,636?R
What is the value of the 9 in 69,386?D
What is the value of the 5 in 8,599?S
What is the value of the 3 in 385?W
What is the value of the 2 in 238?C
What is the value of the 9 in 392?L
What is the value of the 6 in 267?H
What is the value of the 1 in 612?M
What is the value of the 4 in 4,262?O
What is the value of the 5 in 1,358?I
What is the value of the 9 in 4,986?U
0/16 letters found
Clue 2
Rounding
Our sky radar is fuzzy because of the storm. It only shows rounded numbers for the distance to the pirate hideout.
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
7000
200
2900
7000
290
200
370
5000
130
170
T
70
7000
200
700
5000
T
70
200
200
30
170
290
T
70
7000
T
70
7000
200
290
30
900
200
370
T
70
7000
130
2300
500
Round 73 to the nearest tenT
Round 712 to the nearest hundredM
Round 127 to the nearest tenA
Round 170 to the nearest tenW
Round 2,861 to the nearest hundredC
Round 291 to the nearest tenI
Round 172 to the nearest hundredE
Round 34 to the nearest tenR
Round 6,608 to the nearest thousandH
Round 895 to the nearest hundredL
Round 374 to the nearest tenF
Round 4,851 to the nearest thousandS
Round 510 to the nearest hundredD
Round 2,318 to the nearest hundredN
0/14 letters found
Clue 3
Addition
We found a big pile of stolen cargo boxes on the wooden dock. Adding up the total boxes will lead us to the suspect.
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
2478
6243
7134
4901
4127
3549
6464
6712
5156
2808
5097
8024
4417
6712
W
2478
6243
6243
5156
8866
4901
3549
6243
4417
2808
3549
5156
8866
6243
5097
2683
3808
2808
3549
1170 + 1308 =W
4450 + 2262 =S
1223 + 1585 =I
2527 + 1600 =U
1488 + 2929 =Y
2080 + 3017 =C
2718 + 4416 =F
1379 + 2429 =B
4304 + 2160 =D
2223 + 2933 =T
904 + 1779 =A
3918 + 4106 =K
4751 + 4115 =H
2489 + 3754 =E
2945 + 1956 =O
2462 + 1087 =N
0/16 letters found
Clue 4
Subtraction
The thief dumped heavy gear to make their airship lighter. If we subtract the remaining weight, we can find out what they dropped.
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
1750
7204
7003
8511
8556
A
1750
8668
8511
A
1750
8668
A
1750
1839
A
1750
4280
4280
8247
4565
8427
5651
8247
3441
8247
7121
7003
4280
A
1750
4453
3182
7204
3441
1565
7003
3321 - 1571 =A
4570 - 2731 =W
10047 - 2843 =R
11206 - 4085 =H
9994 - 1438 =B
8699 - 188 =D
2773 - 1208 =P
4704 - 1522 =L
7094 - 2814 =S
5391 - 826 =U
11919 - 3492 =C
7271 - 1620 =K
10860 - 2613 =T
11424 - 2756 =N
8532 - 1529 =E
4410 - 969 =O
8046 - 3593 =I
0/17 letters found
Clue 5
Division facts (1-12) — the last clue
The search team found a chest of gold coins. Splitting the coins equally among the crewmates will help us decode the final message.
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
30 ÷ 10 = ?
45 ÷ 9 = ?
72 ÷ 6 = ?
36 ÷ 4 = ?
6 ÷ 3 = ?
12 ÷ 12 = ?
70 ÷ 7 = ?
8 ÷ 2 = ?
72 ÷ 12 = ?
32 ÷ 4 = ?
63 ÷ 9 = ?
Step 2 — cross out the sentence with each answer
1.The villain soared off with a wind glider, then measured the sunlight with a pocket sundial.
2.The villain zoomed away using a steam booster, then decoded the escape route with a map decoder.
3.The villain peered through a brass spyglass, then lit the dark sky with a spark lantern.
4.The villain dropped down a heavy cloud anchor, then decoded the escape route with a map decoder.
5.The villain swung away on a grappling hook, then checked the heading on a mini compass.
6.The villain dropped down a heavy cloud anchor, then blew a loud warning on a storm whistle.
7.The villain soared off with a wind glider, then blew a loud warning on a storm whistle.
8.The villain dropped down a heavy cloud anchor, then measured the sunlight with a pocket sundial.
9.The villain soared off with a wind glider, then lit the dark sky with a spark lantern.
10.The villain zoomed away using a steam booster, then blew a loud warning on a storm whistle.
11.The villain swung away on a grappling hook, then lit the dark sky with a spark lantern.
12.The villain peered through a brass spyglass, then checked the heading on a mini compass.
Solve it
Name the culprit
Choose the one suspect left standing.
Answer Key — The Cloud Haven Compass Heist
Culprit: Captain De Soto (grappling hook · spark lantern · left handed steering · red bandana · sweet honey biscuits)
- Clue 1 (Place value): "THE SUSPECT DOES NOT USE A STORM WHISTLE"What is the value of the 7 in 470? = 70 (T) · What is the value of the 3 in 3,000? = 3000 (P) · What is the value of the 6 in 681? = 600 (N) · What is the value of the 6 in 46,554? = 6000 (E) · What is the value of the 3 in 536? = 30 (A) · What is the value of the 7 in 7,636? = 7000 (R) · What is the value of the 9 in 69,386? = 9000 (D) · What is the value of the 5 in 8,599? = 500 (S) · What is the value of the 3 in 385? = 300 (W) · What is the value of the 2 in 238? = 200 (C) · What is the value of the 9 in 392? = 90 (L) · What is the value of the 6 in 267? = 60 (H) · What is the value of the 1 in 612? = 10 (M) · What is the value of the 4 in 4,262? = 4000 (O) · What is the value of the 5 in 1,358? = 50 (I) · What is the value of the 9 in 4,986? = 900 (U)
- Clue 2 (Rounding): "THE CHIEF SAW THEM STEER WITH THEIR LEFT HAND"Round 73 to the nearest ten = 70 (T) · Round 712 to the nearest hundred = 700 (M) · Round 127 to the nearest ten = 130 (A) · Round 170 to the nearest ten = 170 (W) · Round 2,861 to the nearest hundred = 2900 (C) · Round 291 to the nearest ten = 290 (I) · Round 172 to the nearest hundred = 200 (E) · Round 34 to the nearest ten = 30 (R) · Round 6,608 to the nearest thousand = 7000 (H) · Round 895 to the nearest hundred = 900 (L) · Round 374 to the nearest ten = 370 (F) · Round 4,851 to the nearest thousand = 5000 (S) · Round 510 to the nearest hundred = 500 (D) · Round 2,318 to the nearest hundred = 2300 (N)
- Clue 3 (Addition): "WE FOUND STICKY SWEET HONEY IN THE CABIN"1170 + 1308 = 2478 (W) · 4450 + 2262 = 6712 (S) · 1223 + 1585 = 2808 (I) · 2527 + 1600 = 4127 (U) · 1488 + 2929 = 4417 (Y) · 2080 + 3017 = 5097 (C) · 2718 + 4416 = 7134 (F) · 1379 + 2429 = 3808 (B) · 4304 + 2160 = 6464 (D) · 2223 + 2933 = 5156 (T) · 904 + 1779 = 2683 (A) · 3918 + 4106 = 8024 (K) · 4751 + 4115 = 8866 (H) · 2489 + 3754 = 6243 (E) · 2945 + 1956 = 4901 (O) · 2462 + 1087 = 3549 (N)
- Clue 4 (Subtraction): "A RED BANDANA WAS STUCK TO THE SAIL ROPE"3321 - 1571 = 1750 (A) · 4570 - 2731 = 1839 (W) · 10047 - 2843 = 7204 (R) · 11206 - 4085 = 7121 (H) · 9994 - 1438 = 8556 (B) · 8699 - 188 = 8511 (D) · 2773 - 1208 = 1565 (P) · 4704 - 1522 = 3182 (L) · 7094 - 2814 = 4280 (S) · 5391 - 826 = 4565 (U) · 11919 - 3492 = 8427 (C) · 7271 - 1620 = 5651 (K) · 10860 - 2613 = 8247 (T) · 11424 - 2756 = 8668 (N) · 8532 - 1529 = 7003 (E) · 4410 - 969 = 3441 (O) · 8046 - 3593 = 4453 (I)
- Clue 5 (Division facts (1-12)): surviving statement (box 11) → Captain De Soto30 ÷ 10 = 3 · 45 ÷ 9 = 5 · 72 ÷ 6 = 12 · 36 ÷ 4 = 9 · 6 ÷ 3 = 2 · 12 ÷ 12 = 1 · 70 ÷ 7 = 10 · 8 ÷ 2 = 4 · 72 ÷ 12 = 6 · 32 ÷ 4 = 8 · 63 ÷ 9 = 7
About this mystery
- Grade level
- Grade 4 math
- Math topics
- Place value, Rounding, Addition, Subtraction, Division
- Reading level
- grades 3-4
- Theme
- The Cloud Haven Compass Heist — set in the floating docks of Cloud Haven
- Format
- Interactive online & printable worksheet with answer key
- Solution
- One unique, verified culprit among 21 suspects