Grade 4Reading: grades 3-4Place valueRoundingAdditionSubtractionDivision
The Secret of Whisper Island
Oh no! A sneaky Sky Bandit has stolen the legendary Compass of Wind from the Chief Mapmaker! We must track down the culprit before they fly away from our floating island!
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 | Special Gear | Animal Partner | Glove Style | Hair Style | Favorite Snack |
|---|---|---|---|---|---|
| Ned | Spyglass Boot | Sly Raccoon | Right Glove Only | Braided Hair | Salty Pretzels |
| Leo | Glider Cape | Tree Frog | Left Glove Only | Curly Hair | Sweet Bananas |
| Gus | Puffer Balloon | Pet Parrot | Left Glove Only | Spiky Hair | Salty Pretzels |
| Ava | Spyglass Boot | Baby Falcon | Right Glove Only | Spiky Hair | Sweet Bananas |
| Fox | Grappling Hook | Sly Raccoon | Left Glove Only | Curly Hair | Sour Berries |
| Rex | Spyglass Boot | Tiny Monkey | Right Glove Only | Spiky Hair | Sour Berries |
| Mia | Pocket Compass | Pet Parrot | Right Glove Only | Spiky Hair | Sour Berries |
| Max | Pocket Compass | Tree Frog | Right Glove Only | Braided Hair | Sweet Bananas |
| Joy | Puffer Balloon | Pet Parrot | Right Glove Only | Braided Hair | Sweet Bananas |
| Sam | Grappling Hook | Baby Falcon | Left Glove Only | Curly Hair | Sour Berries |
| Jax | Spyglass Boot | Tree Frog | Left Glove Only | Curly Hair | Salty Pretzels |
| Roy | Spyglass Boot | Tiny Monkey | Left Glove Only | Spiky Hair | Sour Berries |
| Amy | Glider Cape | Tiny Monkey | Left Glove Only | Braided Hair | Salty Pretzels |
| Eli | Spyglass Boot | Pet Parrot | Left Glove Only | Spiky Hair | Salty Pretzels |
| Eve | Puffer Balloon | Sly Raccoon | Right Glove Only | Spiky Hair | Sour Berries |
| Kai | Spyglass Boot | Pet Parrot | Right Glove Only | Spiky Hair | Sour Berries |
| Kit | Glider Cape | Baby Falcon | Left Glove Only | Curly Hair | Sweet Bananas |
| Dan | Puffer Balloon | Baby Falcon | Left Glove Only | Curly Hair | Sweet Bananas |
| Jon | Puffer Balloon | Baby Falcon | Right Glove Only | Spiky Hair | Sour Berries |
| Hal | Spyglass Boot | Baby Falcon | Right Glove Only | Braided Hair | Sour Berries |
| Ivy | Spyglass Boot | Sly Raccoon | Left Glove Only | Spiky Hair | Salty Pretzels |
Clue 1
Place value
The map room door has a heavy digital lock. To slide the bolt open, we must find the value of the digit in the tens place on this dusty keypad.
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
400
3000
30
900
90
5000
10
600
8000
T
400
4000
9000
30
6000
20
9000
T
400
T
400
600
2000
200
30
5000
100
8000
T
400
3000
2000
600
2000
900
900
9000
9000
20
What is the value of the 4 in 429?T
What is the value of the 2 in 32,057?A
What is the value of the 5 in 5,870?L
What is the value of the 1 in 153?W
What is the value of the 9 in 2,897?U
What is the value of the 9 in 29,730?O
What is the value of the 3 in 8,435?E
What is the value of the 2 in 624?N
What is the value of the 6 in 7,644?R
What is the value of the 9 in 910?C
What is the value of the 1 in 4,914?P
What is the value of the 3 in 23,844?H
What is the value of the 6 in 46,774?S
What is the value of the 2 in 261?V
What is the value of the 8 in 8,749?I
What is the value of the 4 in 4,639?D
0/16 letters found
Clue 2
Rounding
The wind speed meter on the bridge is vibrating wildly. We need to round the spinning numbers to the nearest ten to see if it is safe to cross.
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
1300
70
200
230
300
50
50
2000
300
370
5000
500
200
500
T
1300
70
200
1700
300
1100
70
T
1300
1100
50
290
230
200
290
370
50
90
Round 1,298 to the nearest hundredT
Round 66 to the nearest tenH
Round 277 to the nearest hundredI
Round 1,056 to the nearest hundredG
Round 1,694 to the nearest thousandA
Round 1,713 to the nearest hundredR
Round 157 to the nearest hundredE
Round 504 to the nearest hundredS
Round 234 to the nearest tenV
Round 5,490 to the nearest thousandU
Round 93 to the nearest tenY
Round 370 to the nearest tenN
Round 291 to the nearest tenO
Round 49 to the nearest tenL
0/14 letters found
Clue 3
Addition
We found the old explorer logbooks in the grass. By adding the count of gold coins from the first page to the second page, we can unlock a hidden 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.
S
2758
7094
6713
6339
6126
6880
6339
6339
4481
6880
S
2758
7693
6880
6339
6880
8215
7094
6713
9325
8483
7888
3232
3232
5233
6880
4723
7888
2064
3471
S
2758
4481
3232
6880
891 + 1867 =S
3031 + 3308 =R
1169 + 2063 =T
1295 + 769 =M
1600 + 3633 =H
2368 + 1103 =P
1629 + 3094 =C
5291 + 2597 =A
3601 + 4614 =F
4839 + 2854 =W
3901 + 5424 =N
4196 + 1930 =B
2899 + 5584 =D
2656 + 1825 =I
4058 + 2822 =E
3844 + 2869 =U
4310 + 2784 =O
0/17 letters found
Clue 4
Subtraction
A crate of climbing supplies was torn open by the high winds. If we subtract the damaged ropes from our total gear, we will know what is left to use.
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
4902
8298
3298
5226
4164
5936
1974
3298
7243
S
4902
8118
7243
1974
8287
1227
S
4902
3702
3327
7243
3327
6676
8287
8118
5936
3327
7243
6676
8298
3327
5784 - 882 =S
13006 - 4708 =P
6423 - 1197 =K
8253 - 135 =T
6565 - 629 =H
11521 - 3234 =N
5169 - 1467 =W
6178 - 2851 =E
6660 - 3362 =I
8154 - 1478 =O
5837 - 3863 =A
8078 - 835 =R
4086 - 2859 =D
7903 - 3739 =Y
0/14 letters found
Clue 5
Division facts (1-12) — the last clue
We finally reached the giant stone steps leading up to the cloud peaks. If we split our team into equal groups, we can search the ruins much faster.
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
9 ÷ 3 = ?
6 ÷ 1 = ?
6 ÷ 3 = ?
64 ÷ 8 = ?
6 ÷ 6 = ?
36 ÷ 3 = ?
56 ÷ 8 = ?
60 ÷ 6 = ?
108 ÷ 12 = ?
60 ÷ 12 = ?
24 ÷ 6 = ?
Step 2 — cross out the sentence with each answer
1.The villain glides down from the sky, then lets the monkey grab the map.
2.The villain checks the pocket compass, then sends the parrot to distract.
3.The villain inflates the puffer balloon, then signals the falcon to swoop.
4.The villain peeks through the spyglass boot, then commands the raccoon to dig.
5.The villain glides down from the sky, then signals the falcon to swoop.
6.The villain peeks through the spyglass boot, then lets the monkey grab the map.
7.The villain peeks through the spyglass boot, then watches the frog jump ahead.
8.The villain inflates the puffer balloon, then sends the parrot to distract.
9.The villain peeks through the spyglass boot, then signals the falcon to swoop.
10.The villain inflates the puffer balloon, then watches the frog jump ahead.
11.The villain peeks through the spyglass boot, then sends the parrot to distract.
12.The villain uses the grappling hook to swing, then sends the parrot to distract.
Solve it
Name the culprit
Choose the one suspect left standing.
Answer Key — The Secret of Whisper Island
Culprit: Kai (Spyglass Boot · Pet Parrot · Right Glove Only · Spiky Hair · Sour Berries)
- Clue 1 (Place value): "THE CULPRIT DOES NOT TRAVEL WITH A RACCOON"What is the value of the 4 in 429? = 400 (T) · What is the value of the 2 in 32,057? = 2000 (A) · What is the value of the 5 in 5,870? = 5000 (L) · What is the value of the 1 in 153? = 100 (W) · What is the value of the 9 in 2,897? = 90 (U) · What is the value of the 9 in 29,730? = 9000 (O) · What is the value of the 3 in 8,435? = 30 (E) · What is the value of the 2 in 624? = 20 (N) · What is the value of the 6 in 7,644? = 600 (R) · What is the value of the 9 in 910? = 900 (C) · What is the value of the 1 in 4,914? = 10 (P) · What is the value of the 3 in 23,844? = 3000 (H) · What is the value of the 6 in 46,774? = 6000 (S) · What is the value of the 2 in 261? = 200 (V) · What is the value of the 8 in 8,749? = 8000 (I) · What is the value of the 4 in 4,639? = 4000 (D)
- Clue 2 (Rounding): "THE VILLAIN USES THE RIGHT GLOVE ONLY"Round 1,298 to the nearest hundred = 1300 (T) · Round 66 to the nearest ten = 70 (H) · Round 277 to the nearest hundred = 300 (I) · Round 1,056 to the nearest hundred = 1100 (G) · Round 1,694 to the nearest thousand = 2000 (A) · Round 1,713 to the nearest hundred = 1700 (R) · Round 157 to the nearest hundred = 200 (E) · Round 504 to the nearest hundred = 500 (S) · Round 234 to the nearest ten = 230 (V) · Round 5,490 to the nearest thousand = 5000 (U) · Round 93 to the nearest ten = 90 (Y) · Round 370 to the nearest ten = 370 (N) · Round 291 to the nearest ten = 290 (O) · Round 49 to the nearest ten = 50 (L)
- Clue 3 (Addition): "SOUR BERRIES WERE FOUND AT THE CAMPSITE"891 + 1867 = 2758 (S) · 3031 + 3308 = 6339 (R) · 1169 + 2063 = 3232 (T) · 1295 + 769 = 2064 (M) · 1600 + 3633 = 5233 (H) · 2368 + 1103 = 3471 (P) · 1629 + 3094 = 4723 (C) · 5291 + 2597 = 7888 (A) · 3601 + 4614 = 8215 (F) · 4839 + 2854 = 7693 (W) · 3901 + 5424 = 9325 (N) · 4196 + 1930 = 6126 (B) · 2899 + 5584 = 8483 (D) · 2656 + 1825 = 4481 (I) · 4058 + 2822 = 6880 (E) · 3844 + 2869 = 6713 (U) · 4310 + 2784 = 7094 (O)
- Clue 4 (Subtraction): "SPIKY HAIR STRANDS WERE ON THE ROPE"5784 - 882 = 4902 (S) · 13006 - 4708 = 8298 (P) · 6423 - 1197 = 5226 (K) · 8253 - 135 = 8118 (T) · 6565 - 629 = 5936 (H) · 11521 - 3234 = 8287 (N) · 5169 - 1467 = 3702 (W) · 6178 - 2851 = 3327 (E) · 6660 - 3362 = 3298 (I) · 8154 - 1478 = 6676 (O) · 5837 - 3863 = 1974 (A) · 8078 - 835 = 7243 (R) · 4086 - 2859 = 1227 (D) · 7903 - 3739 = 4164 (Y)
- Clue 5 (Division facts (1-12)): surviving statement (box 11) → Kai9 ÷ 3 = 3 · 6 ÷ 1 = 6 · 6 ÷ 3 = 2 · 64 ÷ 8 = 8 · 6 ÷ 6 = 1 · 36 ÷ 3 = 12 · 56 ÷ 8 = 7 · 60 ÷ 6 = 10 · 108 ÷ 12 = 9 · 60 ÷ 12 = 5 · 24 ÷ 6 = 4
About this mystery
- Grade level
- Grade 4 math
- Math topics
- Place value, Rounding, Addition, Subtraction, Division
- Reading level
- grades 3-4
- Theme
- The Secret of Whisper Island — set in Whisper Island
- Format
- Interactive online & printable worksheet with answer key
- Solution
- One unique, verified culprit among 21 suspects