Grade 3Reading: grades 3-4AdditionSubtractionWord problemsSkip countingDivision
The Lost Sapphire of Skull Island
A sneaky rogue explorer took the golden statue from the island temple. Use the clues to figure out who did it and save the expedition!
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 | Main Tool | Side Gear | Dominant Hand | Hair Style | Secret Fear |
|---|---|---|---|---|---|
| Indy Rivers | Compass Navigation | Heavy Machete | Right Handed | Red Waves | Squeaky Boots |
| Cleo Cliff | Compass Navigation | Flaming Torch | Left Handed | Red Waves | Bright Flashlight |
| Rex Ranger | Rope Swing | Flaming Torch | Right Handed | Red Waves | Squeaky Boots |
| Flint Falcon | Compass Navigation | Signal Flare | Right Handed | Red Waves | Squeaky Boots |
| Nora Knight | Grappling Hook | Paraglider | Left Handed | Silver Buzz | Squeaky Boots |
| Sam Stone | Grappling Hook | Signal Flare | Left Handed | Brown Braid | Bright Flashlight |
| Maya Temple | Vine Crawl | Paraglider | Right Handed | Red Waves | Squeaky Boots |
| Jax Jumper | Compass Navigation | Golden Cutlass | Right Handed | Red Waves | Squeaky Boots |
| Dash Drake | Grappling Hook | Golden Cutlass | Right Handed | Silver Buzz | Squeaky Boots |
| Skye Scout | Grappling Hook | Paraglider | Left Handed | Silver Buzz | Bright Flashlight |
| Cole Canyon | Rope Swing | Golden Cutlass | Left Handed | Brown Braid | Squeaky Boots |
| Wade Wilder | Rope Swing | Signal Flare | Left Handed | Silver Buzz | Loud Whistle |
| Kai Valley | Smoke Bomb | Flaming Torch | Right Handed | Red Waves | Bright Flashlight |
| Tess Trail | Compass Navigation | Flaming Torch | Left Handed | Brown Braid | Bright Flashlight |
| Zoe Ziggurat | Grappling Hook | Flaming Torch | Right Handed | Red Waves | Loud Whistle |
| Bram Boulder | Vine Crawl | Flaming Torch | Right Handed | Brown Braid | Loud Whistle |
| Opal Outpost | Compass Navigation | Signal Flare | Left Handed | Brown Braid | Bright Flashlight |
| Ivy Insel | Grappling Hook | Flaming Torch | Right Handed | Brown Braid | Squeaky Boots |
| Ruby Ridge | Compass Navigation | Paraglider | Right Handed | Brown Braid | Squeaky Boots |
| Leo Vance | Smoke Bomb | Heavy Machete | Left Handed | Red Waves | Squeaky Boots |
| Liam Locke | Compass Navigation | Golden Cutlass | Left Handed | Silver Buzz | Squeaky Boots |
Clue 1
Addition
We counted all the supplies left at camp to find our first code.
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
490
933
779
923
859
570
570
238
859
869
743
457
779
435
869
457
T
490
276
435
779
238
435
859
896
869
238
570
452
570
238
410
779
258 + 232 =T
96 + 180 =U
139 + 99 =A
183 + 274 =O
523 + 256 =E
475 + 268 =D
358 + 575 =H
231 + 204 =S
156 + 296 =F
306 + 264 =L
615 + 308 =V
575 + 321 =G
472 + 387 =I
462 + 407 =N
187 + 223 =R
0/15 letters found
Clue 2
Subtraction
We compared the tracks in the mud to see how far ahead the villain was.
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
360
552
479
733
671
733
779
479
895
T
360
622
186
377
779
779
479
622
822
186
677
259
552
T
360
552
822
420
622
479
622
259
492
377
830
479
746 - 386 =T
846 - 224 =D
818 - 39 =P
746 - 69 =I
1173 - 351 =A
432 - 12 =N
635 - 83 =H
743 - 366 =O
1052 - 157 =C
494 - 235 =G
1061 - 390 =U
735 - 2 =S
618 - 139 =E
937 - 107 =V
602 - 110 =L
420 - 234 =R
0/16 letters found
Clue 3
Word problems
The team packed rescue gear into crates to solve the next clue.
Solve each problem to learn its letter, then write the letters in the boxes to fill in the missing word.
Someonescaredthevillainoffwith .
S
33
20
74
31
62
13
65
B
O
O
T
S
33
Jungle Scout lined up 11 rows of 3 brass lanterns. How many brass lanterns in all?S
Jungle Scout found 26 canteen cups yesterday and 5 more today. How many canteen cups in all?E
There were 95 canteen cups. 30 were used up. How many canteen cups are left?Y
There were 102 canteen cups. 28 were used up. How many canteen cups are left?U
There were 37 rope bundles. 24 were used up. How many rope bundles are left?K
Jungle Scout found 53 rope bundles yesterday and 9 more today. How many rope bundles in all?A
There were 39 map scrolls. 19 were used up. How many map scrolls are left?Q
0/7 letters found
Clue 4
Skip counting
We counted footprints in equal jumps along the sandy trail.
Solve each problem to learn its letter. Then write that letter in every box that shows the same number, and read the secret clue.
R
15
18
130
90
6
8
18
42
60
6
14
R
15
90
6
42
24
18
10
30
6
30
30
60
18
55
6
22
39
Skip-count by 5s. Fill the blank: 5, 10, ___, 20, 25R
Skip-count by 10s. Fill the blank: 10, 20, 30, 40, 50, 60, 70, 80, ___, 100, 110W
Skip-count by 2s. Fill the blank: 2, 4, ___, 8, 10A
Skip-count by 3s. Fill the blank: 3, 6, 9, 12, 15, 18, 21, 24, 27, 30, 33, 36, ___, 42, 45P
Skip-count by 2s. Fill the blank: 2, 4, 6, 8, 10, 12, 14, 16, ___, 20, 22E
Skip-count by 2s. Fill the blank: 2, 4, 6, 8, 10, 12, ___, 16, 18I
Skip-count by 5s. Fill the blank: 5, 10, 15, 20, 25, 30, 35, 40, 45, 50, ___, 60, 65C
Skip-count by 2s. Fill the blank: 2, 4, 6, ___, 10, 12V
Skip-count by 10s. Fill the blank: 10, 20, 30, 40, 50, 60, 70, 80, 90, 100, 110, 120, ___, 140, 150D
Skip-count by 2s. Fill the blank: 2, 4, 6, 8, ___, 12, 14F
Skip-count by 2s. Fill the blank: 2, 4, 6, 8, 10, 12, 14, 16, 18, 20, ___, 24, 26M
Skip-count by 5s. Fill the blank: 5, 10, 15, 20, 25, 30, 35, 40, 45, 50, 55, ___, 65, 70H
Skip-count by 10s. Fill the blank: 10, 20, ___, 40, 50T
Skip-count by 3s. Fill the blank: 3, 6, 9, 12, 15, 18, 21, ___, 27, 30L
Skip-count by 3s. Fill the blank: 3, 6, 9, 12, 15, 18, 21, 24, 27, 30, 33, 36, 39, ___, 45, 48S
0/15 letters found
Clue 5
Division facts (1-12) — the last clue
We split the remaining compasses evenly among the search parties.
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
64 ÷ 8 = ?
24 ÷ 8 = ?
36 ÷ 3 = ?
63 ÷ 7 = ?
6 ÷ 3 = ?
5 ÷ 1 = ?
99 ÷ 9 = ?
18 ÷ 3 = ?
80 ÷ 8 = ?
16 ÷ 4 = ?
8 ÷ 8 = ?
Step 2 — cross out the sentence with each answer
1.The villain swung on a thick vine, then lit the dark cave with a torch.
2.The villain threw a thick smoke bomb, then lit the dark cave with a torch.
3.The villain crawled across jungle vines, then glided off a cliff.
4.The villain crawled across jungle vines, then swung a golden cutlass.
5.The villain threw a thick smoke bomb, then swung a golden cutlass.
6.The villain used a sturdy grappling hook, then fired a bright flare.
7.The villain navigated with an old compass, then swung a golden cutlass.
8.The villain navigated with an old compass, then cleared paths with a machete.
9.The villain threw a thick smoke bomb, then cleared paths with a machete.
10.The villain crawled across jungle vines, then fired a bright flare.
11.The villain crawled across jungle vines, then cleared paths with a machete.
12.The villain used a sturdy grappling hook, then lit the dark cave with a torch.
Solve it
Name the culprit
Choose the one suspect left standing.
Answer Key — The Lost Sapphire of Skull Island
Culprit: Jax Jumper (Compass Navigation · Golden Cutlass · Right Handed · Red Waves · Squeaky Boots)
- Clue 1 (Addition): "THE VILLAIN DOES NOT USE A SIGNAL FLARE"258 + 232 = 490 (T) · 96 + 180 = 276 (U) · 139 + 99 = 238 (A) · 183 + 274 = 457 (O) · 523 + 256 = 779 (E) · 475 + 268 = 743 (D) · 358 + 575 = 933 (H) · 231 + 204 = 435 (S) · 156 + 296 = 452 (F) · 306 + 264 = 570 (L) · 615 + 308 = 923 (V) · 575 + 321 = 896 (G) · 472 + 387 = 859 (I) · 462 + 407 = 869 (N) · 187 + 223 = 410 (R)
- Clue 2 (Subtraction): "THE SUSPECT DROPPED A RIGHT HANDED GLOVE"746 - 386 = 360 (T) · 846 - 224 = 622 (D) · 818 - 39 = 779 (P) · 746 - 69 = 677 (I) · 1173 - 351 = 822 (A) · 432 - 12 = 420 (N) · 635 - 83 = 552 (H) · 743 - 366 = 377 (O) · 1052 - 157 = 895 (C) · 494 - 235 = 259 (G) · 1061 - 390 = 671 (U) · 735 - 2 = 733 (S) · 618 - 139 = 479 (E) · 937 - 107 = 830 (V) · 602 - 110 = 492 (L) · 420 - 234 = 186 (R)
- Clue 3 (Word problems): "SQUEAKY BOOTS"Jungle Scout lined up 11 rows of 3 brass lanterns. How many brass lanterns in all? = 33 (S) · Jungle Scout found 26 canteen cups yesterday and 5 more today. How many canteen cups in all? = 31 (E) · There were 95 canteen cups. 30 were used up. How many canteen cups are left? = 65 (Y) · There were 102 canteen cups. 28 were used up. How many canteen cups are left? = 74 (U) · There were 37 rope bundles. 24 were used up. How many rope bundles are left? = 13 (K) · Jungle Scout found 53 rope bundles yesterday and 9 more today. How many rope bundles in all? = 62 (A) · There were 39 map scrolls. 19 were used up. How many map scrolls are left? = 20 (Q)
- Clue 4 (Skip counting): "RED WAVES HAIR WAS LEFT AT THE CAMP"Skip-count by 5s. Fill the blank: 5, 10, ___, 20, 25 = 15 (R) · Skip-count by 10s. Fill the blank: 10, 20, 30, 40, 50, 60, 70, 80, ___, 100, 110 = 90 (W) · Skip-count by 2s. Fill the blank: 2, 4, ___, 8, 10 = 6 (A) · Skip-count by 3s. Fill the blank: 3, 6, 9, 12, 15, 18, 21, 24, 27, 30, 33, 36, ___, 42, 45 = 39 (P) · Skip-count by 2s. Fill the blank: 2, 4, 6, 8, 10, 12, 14, 16, ___, 20, 22 = 18 (E) · Skip-count by 2s. Fill the blank: 2, 4, 6, 8, 10, 12, ___, 16, 18 = 14 (I) · Skip-count by 5s. Fill the blank: 5, 10, 15, 20, 25, 30, 35, 40, 45, 50, ___, 60, 65 = 55 (C) · Skip-count by 2s. Fill the blank: 2, 4, 6, ___, 10, 12 = 8 (V) · Skip-count by 10s. Fill the blank: 10, 20, 30, 40, 50, 60, 70, 80, 90, 100, 110, 120, ___, 140, 150 = 130 (D) · Skip-count by 2s. Fill the blank: 2, 4, 6, 8, ___, 12, 14 = 10 (F) · Skip-count by 2s. Fill the blank: 2, 4, 6, 8, 10, 12, 14, 16, 18, 20, ___, 24, 26 = 22 (M) · Skip-count by 5s. Fill the blank: 5, 10, 15, 20, 25, 30, 35, 40, 45, 50, 55, ___, 65, 70 = 60 (H) · Skip-count by 10s. Fill the blank: 10, 20, ___, 40, 50 = 30 (T) · Skip-count by 3s. Fill the blank: 3, 6, 9, 12, 15, 18, 21, ___, 27, 30 = 24 (L) · Skip-count by 3s. Fill the blank: 3, 6, 9, 12, 15, 18, 21, 24, 27, 30, 33, 36, 39, ___, 45, 48 = 42 (S)
- Clue 5 (Division facts (1-12)): surviving statement (box 7) → Jax Jumper64 ÷ 8 = 8 · 24 ÷ 8 = 3 · 36 ÷ 3 = 12 · 63 ÷ 7 = 9 · 6 ÷ 3 = 2 · 5 ÷ 1 = 5 · 99 ÷ 9 = 11 · 18 ÷ 3 = 6 · 80 ÷ 8 = 10 · 16 ÷ 4 = 4 · 8 ÷ 8 = 1
About this mystery
- Grade level
- Grade 3 math
- Math topics
- Addition, Subtraction, Word problems, Skip counting, Division
- Reading level
- grades 3-4
- Theme
- The Lost Sapphire of Skull Island — set in Skull Island Jungle
- Format
- Interactive online & printable worksheet with answer key
- Solution
- One unique, verified culprit among 21 suspects