Grade 3Reading: grades 3-4RoundingAdditionSubtractionMultiplicationDivision
The Sky Island Mystery
Someone snuck into Cloudtop Academy and snatched the golden skychart! Help the Junior Sky Rangers examine clues and catch the culprit.
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 | Gear | Gadget | Dominant Hand | Hairstyle | Dislike |
|---|---|---|---|---|---|
| Cadet Chloe | cloud boots | flash mirror | left handed | spiky red | bright flashlight |
| Captain Barnaby | grapple hook | flash mirror | right handed | braided brown | loud whistle |
| Lookout Luke | magnetic compass | smoke bombs | right handed | spiky red | bright flashlight |
| Commander Cole | grapple hook | smoke bombs | left handed | braided brown | loud whistle |
| Tracker Toby | cloud boots | decoy map | right handed | spiky red | bright flashlight |
| Aviator Axel | cloud boots | decoy map | right handed | braided brown | sudden splash |
| Scout Sam | magnetic compass | rope net | right handed | buzz cut black | loud whistle |
| Pilot Penny | glider wings | flash mirror | right handed | buzz cut black | loud whistle |
| Cadet Leo | magnetic compass | rope net | right handed | spiky red | bright flashlight |
| Detective Dan | magnetic compass | decoy map | right handed | braided brown | bright flashlight |
| Rookie Rex | pulse lantern | smoke bombs | right handed | buzz cut black | sudden splash |
| Tracker Trent | cloud boots | smoke bombs | right handed | spiky red | sudden splash |
| Agent Abby | pulse lantern | flash mirror | left handed | spiky red | bright flashlight |
| Sentry Felix | magnetic compass | fog whistle | left handed | buzz cut black | bright flashlight |
| Pilot Piper | glider wings | rope net | right handed | braided brown | bright flashlight |
| Explorer Eva | magnetic compass | fog whistle | right handed | buzz cut black | sudden splash |
| Scout Stella | grapple hook | fog whistle | left handed | buzz cut black | loud whistle |
| Explorer Ella | glider wings | rope net | right handed | buzz cut black | sudden splash |
| Officer Olivia | cloud boots | rope net | right handed | spiky red | bright flashlight |
| Mechanic Max | pulse lantern | fog whistle | left handed | spiky red | bright flashlight |
| Agent Arthur | glider wings | flash mirror | right handed | spiky red | bright flashlight |
Clue 1
Rounding
The radar scanner only gives estimated distances rounded to the nearest ten.
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
7000
200
6000
800
20
20
60
800
9000
80
300
200
4000
9000
300
T
5000
400
4000
200
60
3000
20
60
4000
7000
70
800
90
90
300
90
Round 5,174 to the nearest thousandT
Round 780 to the nearest hundredI
Round 2,777 to the nearest thousandF
Round 411 to the nearest hundredU
Round 81 to the nearest tenD
Round 208 to the nearest hundredE
Round 330 to the nearest hundredO
Round 20 to the nearest tenL
Round 87 to the nearest tenR
Round 6,808 to the nearest thousandH
Round 67 to the nearest tenM
Round 58 to the nearest tenA
Round 6,035 to the nearest thousandV
Round 9,438 to the nearest thousandN
Round 4,162 to the nearest thousandS
0/15 letters found
Clue 2
Addition
You add up the trail tokens dropped near the airship hangar.
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
326
373
393
716
919
393
982
674
522
922
982
919
627
582
T
326
373
393
969
627
785
982
915
872
582
T
326
373
238
582
894
373
T
326
373
982
919
627
145 + 181 =T
146 + 227 =H
577 + 295 =W
245 + 471 =S
354 + 431 =M
397 + 585 =A
254 + 139 =E
584 + 310 =G
403 + 566 =L
266 + 316 =I
416 + 499 =P
297 + 622 =N
379 + 295 =K
429 + 493 =B
237 + 390 =D
198 + 324 =Y
152 + 86 =R
0/17 letters found
Clue 3
Subtraction
You count the missing gear crates from the supply deck inventory.
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
635
765
736
107
634
750
550
379
827
A
635
177
750
827
107
634
750
550
642
A
635
782
177
525
158
550
750
525
765
A
635
452
158
107
550
550
384
379
827
525
525
1031 - 396 =A
481 - 29 =N
1020 - 270 =H
199 - 92 =I
625 - 246 =F
782 - 46 =R
178 - 20 =D
799 - 34 =B
437 - 260 =S
727 - 343 =O
999 - 217 =U
673 - 39 =G
1038 - 396 =C
813 - 263 =T
908 - 383 =E
1045 - 218 =L
0/16 letters found
Clue 4
Multiplication facts (1-12)
You inspect the grid of cloud anchors along the sky dock.
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
15
108
45
9
7
84
S
15
28
90
S
15
64
12
81
2
45
49
84
96
9
12
45
120
49
45
49
28
7
108
96
49
99
49
30
49
45
3 × 5 =S
12 × 10 =W
7 × 7 =E
12 × 9 =T
8 × 8 =P
2 × 1 =Y
8 × 12 =H
9 × 11 =L
7 × 12 =D
3 × 3 =A
9 × 9 =K
4 × 3 =I
4 × 7 =O
9 × 5 =R
9 × 10 =F
5 × 6 =V
1 × 7 =N
0/17 letters found
Clue 5
Division facts (1-12) — the last clue
You divide the leftover map fragments evenly among the explorer teams.
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
11 ÷ 1 = ?
40 ÷ 4 = ?
4 ÷ 4 = ?
40 ÷ 5 = ?
10 ÷ 5 = ?
63 ÷ 7 = ?
48 ÷ 12 = ?
15 ÷ 3 = ?
21 ÷ 7 = ?
144 ÷ 12 = ?
24 ÷ 4 = ?
Step 2 — cross out the sentence with each answer
1.The villain bounced on cloud boots, then threw a rope net.
2.The villain used a grapple hook, then blew a fog whistle.
3.The villain glided on wing gliders, then blew a fog whistle.
4.The villain flashed a pulse lantern, then blew a fog whistle.
5.The villain flashed a pulse lantern, then threw a rope net.
6.The villain flashed a pulse lantern, then flashed a mirror.
7.The villain used a magnetic compass, then threw a rope net.
8.The villain glided on wing gliders, then flashed a mirror.
9.The villain used a grapple hook, then threw a rope net.
10.The villain used a magnetic compass, then dropped smoke bombs.
11.The villain bounced on cloud boots, then left a decoy map.
12.The villain used a magnetic compass, then flashed a mirror.
Solve it
Name the culprit
Choose the one suspect left standing.
Answer Key — The Sky Island Mystery
Culprit: Cadet Leo (magnetic compass · rope net · right handed · spiky red · bright flashlight)
- Clue 1 (Rounding): "THE VILLAIN DOES NOT USE A FLASH MIRROR"Round 5,174 to the nearest thousand = 5000 (T) · Round 780 to the nearest hundred = 800 (I) · Round 2,777 to the nearest thousand = 3000 (F) · Round 411 to the nearest hundred = 400 (U) · Round 81 to the nearest ten = 80 (D) · Round 208 to the nearest hundred = 200 (E) · Round 330 to the nearest hundred = 300 (O) · Round 20 to the nearest ten = 20 (L) · Round 87 to the nearest ten = 90 (R) · Round 6,808 to the nearest thousand = 7000 (H) · Round 67 to the nearest ten = 70 (M) · Round 58 to the nearest ten = 60 (A) · Round 6,035 to the nearest thousand = 6000 (V) · Round 9,438 to the nearest thousand = 9000 (N) · Round 4,162 to the nearest thousand = 4000 (S)
- Clue 2 (Addition): "THE SNEAKY BANDIT HELD MAP WITH RIGHT HAND"145 + 181 = 326 (T) · 146 + 227 = 373 (H) · 577 + 295 = 872 (W) · 245 + 471 = 716 (S) · 354 + 431 = 785 (M) · 397 + 585 = 982 (A) · 254 + 139 = 393 (E) · 584 + 310 = 894 (G) · 403 + 566 = 969 (L) · 266 + 316 = 582 (I) · 416 + 499 = 915 (P) · 297 + 622 = 919 (N) · 379 + 295 = 674 (K) · 429 + 493 = 922 (B) · 237 + 390 = 627 (D) · 198 + 324 = 522 (Y) · 152 + 86 = 238 (R)
- Clue 3 (Subtraction): "A BRIGHT FLASHLIGHT CAUSED THE BANDIT TO FLEE"1031 - 396 = 635 (A) · 481 - 29 = 452 (N) · 1020 - 270 = 750 (H) · 199 - 92 = 107 (I) · 625 - 246 = 379 (F) · 782 - 46 = 736 (R) · 178 - 20 = 158 (D) · 799 - 34 = 765 (B) · 437 - 260 = 177 (S) · 727 - 343 = 384 (O) · 999 - 217 = 782 (U) · 673 - 39 = 634 (G) · 1038 - 396 = 642 (C) · 813 - 263 = 550 (T) · 908 - 383 = 525 (E) · 1045 - 218 = 827 (L)
- Clue 4 (Multiplication facts (1-12)): "STRANDS OF SPIKY RED HAIR WERE ON THE LEVER"3 × 5 = 15 (S) · 12 × 10 = 120 (W) · 7 × 7 = 49 (E) · 12 × 9 = 108 (T) · 8 × 8 = 64 (P) · 2 × 1 = 2 (Y) · 8 × 12 = 96 (H) · 9 × 11 = 99 (L) · 7 × 12 = 84 (D) · 3 × 3 = 9 (A) · 9 × 9 = 81 (K) · 4 × 3 = 12 (I) · 4 × 7 = 28 (O) · 9 × 5 = 45 (R) · 9 × 10 = 90 (F) · 5 × 6 = 30 (V) · 1 × 7 = 7 (N)
- Clue 5 (Division facts (1-12)): surviving statement (box 7) → Cadet Leo11 ÷ 1 = 11 · 40 ÷ 4 = 10 · 4 ÷ 4 = 1 · 40 ÷ 5 = 8 · 10 ÷ 5 = 2 · 63 ÷ 7 = 9 · 48 ÷ 12 = 4 · 15 ÷ 3 = 5 · 21 ÷ 7 = 3 · 144 ÷ 12 = 12 · 24 ÷ 4 = 6
About this mystery
- Grade level
- Grade 3 math
- Math topics
- Rounding, Addition, Subtraction, Multiplication, Division
- Reading level
- grades 3-4
- Theme
- The Sky Island Mystery — set in Cloudtop Academy
- Format
- Interactive online & printable worksheet with answer key
- Solution
- One unique, verified culprit among 21 suspects