Grade 3Reading: grades 3-4RoundingAdditionSubtractionMultiplicationDivision
The Lost Island Map Mystery
Oh no! Someone took the Head Mapmaker's golden compass. Without it, the ships cannot find their way home. A clever thief left footprints in the sand. Let us follow the clues and find 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 | Adventure Gear | Secret Gadget | Map Hand | Bandana Color | Silly Fear |
|---|---|---|---|---|---|
| Bella Hook | golden spyglass | bubble blaster | right handed | red bandana | scared of spiders |
| Gulliver Gray | golden spyglass | bubble blaster | left handed | green bandana | scared of spiders |
| Nelly Net | pocket compass | smoke bomb | right handed | red bandana | dislikes tickles |
| Tommy Flint | decoder ring | laser watch | right handed | red bandana | dislikes tickles |
| Molly Map | golden spyglass | glow boots | right handed | blue bandana | dislikes tickles |
| Toby Tide | decoder ring | bubble blaster | right handed | green bandana | afraid of frogs |
| Barnaby Blue | pocket compass | bubble blaster | right handed | red bandana | afraid of frogs |
| Mary Read | golden spyglass | laser watch | right handed | red bandana | scared of spiders |
| Finbar Fish | decoder ring | smoke bomb | right handed | green bandana | scared of spiders |
| Benny Boot | golden spyglass | smoke bomb | right handed | red bandana | scared of spiders |
| Willa Wave | decoder ring | slingshot | right handed | blue bandana | scared of spiders |
| Pip Squeak | decoder ring | smoke bomb | left handed | red bandana | scared of spiders |
| Captain Sam | pocket compass | slingshot | right handed | red bandana | scared of spiders |
| Sandy Shore | golden spyglass | glow boots | right handed | green bandana | afraid of frogs |
| Roger Red | golden spyglass | laser watch | left handed | blue bandana | afraid of frogs |
| Jack Bones | decoder ring | glow boots | right handed | blue bandana | scared of spiders |
| Dolly Dock | golden spyglass | laser watch | right handed | red bandana | afraid of frogs |
| Arty Anchor | bamboo snorkel | bubble blaster | right handed | green bandana | dislikes tickles |
| Peggy Plank | bamboo snorkel | glow boots | right handed | red bandana | afraid of frogs |
| Scurvy Sally | golden spyglass | laser watch | left handed | red bandana | dislikes tickles |
| Peter Patch | decoder ring | glow boots | right handed | red bandana | scared of spiders |
Clue 1
Rounding
To find the next path, we look through a foggy spyglass. The map distances are blurry, so we must round the numbers to the nearest ten to read them.
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
3000
200
80
90
2000
500
500
600
2000
7000
20
6000
80
60
7000
6000
T
3000
200
600
90
80
700
500
6000
300
30
6000
6000
T
3000
60
Round 3,206 to the nearest thousandT
Round 748 to the nearest hundredG
Round 22 to the nearest tenD
Round 89 to the nearest tenV
Round 64 to the nearest tenS
Round 459 to the nearest hundredL
Round 313 to the nearest hundredW
Round 621 to the nearest hundredA
Round 5,564 to the nearest thousandO
Round 200 to the nearest hundredH
Round 26 to the nearest tenB
Round 82 to the nearest tenE
Round 7,393 to the nearest thousandN
Round 2,492 to the nearest thousandI
0/14 letters found
Clue 2
Addition
We found a pile of dropped supplies on the beach. If we add up all the lost water canteens and biscuit boxes, we will find a secret message.
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
445
299
623
706
796
706
832
623
735
T
445
853
951
535
T
445
623
706
853
535
T
445
299
T
445
299
623
535
951
951
535
692
299
T
445
299
676
656
260
305 + 140 =T
329 + 294 =E
295 + 558 =W
249 + 547 =U
285 + 371 =N
413 + 263 =A
485 + 221 =S
306 + 229 =I
518 + 433 =R
421 + 271 =G
307 + 525 =P
386 + 349 =C
147 + 152 =H
106 + 154 =D
0/14 letters found
Clue 3
Subtraction
The crew checks the main supply chest to see what is missing. Subtracting the taken bananas from our starting total reveals a hidden clue.
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
486
328
544
199
331
687
899
544
821
766
864
885
544
251
251
687
124
A
486
864
766
328
489
766
552
A
486
885
A
486
331
752 - 266 =A
824 - 280 =I
864 - 375 =H
844 - 23 =D
345 - 17 =T
1069 - 170 =P
489 - 158 =Y
946 - 82 =R
783 - 96 =S
1068 - 302 =E
928 - 376 =M
387 - 136 =L
1054 - 169 =W
351 - 152 =N
435 - 311 =C
0/15 letters found
Clue 4
Multiplication facts (1-12)
We reach a wall of locked treasure boxes lined up in even rows. Multiplying the rows of chests helps us unlock the code to the next clue.
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
28
22
6
10
33
A
28
11
10
A
28
11
A
28
4
14
22
A
28
60
32
A
28
4
16
6
88
14
33
6
66
132
11
10
4 × 7 =A
2 × 7 =T
1 × 10 =D
11 × 1 =N
11 × 3 =B
8 × 11 =F
6 × 11 =H
6 × 10 =P
2 × 3 =E
4 × 4 =L
8 × 4 =W
4 × 1 =S
11 × 12 =I
2 × 11 =R
0/14 letters found
Clue 5
Division facts (1-12) — the last clue
We must share the found sea crystals equally among our scout team. Dividing the crystals tells us exactly which trail the suspect took.
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
36 ÷ 3 = ?
11 ÷ 1 = ?
36 ÷ 9 = ?
14 ÷ 2 = ?
45 ÷ 9 = ?
30 ÷ 3 = ?
63 ÷ 7 = ?
10 ÷ 10 = ?
72 ÷ 12 = ?
12 ÷ 4 = ?
18 ÷ 9 = ?
Step 2 — cross out the sentence with each answer
1.The villain scaled the rocky cliff using a grappling hook, then fired a walnut with a slingshot as a distraction.
2.The villain scaled the rocky cliff using a grappling hook, then shot a giant bubble blaster to block the path.
3.The villain cracked the treasure vault with a decoder ring, then shined a bright laser watch to escape.
4.The villain swung across the deck with a golden spyglass, then shot a giant bubble blaster to block the path.
5.The villain escaped through the lagoon with a bamboo snorkel, then shot a giant bubble blaster to block the path.
6.The villain cracked the treasure vault with a decoder ring, then fired a walnut with a slingshot as a distraction.
7.The villain scaled the rocky cliff using a grappling hook, then lit up the dark cave with glow boots.
8.The villain swung across the deck with a golden spyglass, then shined a bright laser watch to escape.
9.The villain navigated the dark jungle with a pocket compass, then shined a bright laser watch to escape.
10.The villain cracked the treasure vault with a decoder ring, then vanished in a cloud from a smoke bomb.
11.The villain navigated the dark jungle with a pocket compass, then fired a walnut with a slingshot as a distraction.
12.The villain swung across the deck with a golden spyglass, then vanished in a cloud from a smoke bomb.
Solve it
Name the culprit
Choose the one suspect left standing.
Answer Key — The Lost Island Map Mystery
Culprit: Mary Read (golden spyglass · laser watch · right handed · red bandana · scared of spiders)
- Clue 1 (Rounding): "THE VILLAIN DOES NOT HAVE GLOW BOOTS"Round 3,206 to the nearest thousand = 3000 (T) · Round 748 to the nearest hundred = 700 (G) · Round 22 to the nearest ten = 20 (D) · Round 89 to the nearest ten = 90 (V) · Round 64 to the nearest ten = 60 (S) · Round 459 to the nearest hundred = 500 (L) · Round 313 to the nearest hundred = 300 (W) · Round 621 to the nearest hundred = 600 (A) · Round 5,564 to the nearest thousand = 6000 (O) · Round 200 to the nearest hundred = 200 (H) · Round 26 to the nearest ten = 30 (B) · Round 82 to the nearest ten = 80 (E) · Round 7,393 to the nearest thousand = 7000 (N) · Round 2,492 to the nearest thousand = 2000 (I)
- Clue 2 (Addition): "THE SUSPECT WRITES WITH THEIR RIGHT HAND"305 + 140 = 445 (T) · 329 + 294 = 623 (E) · 295 + 558 = 853 (W) · 249 + 547 = 796 (U) · 285 + 371 = 656 (N) · 413 + 263 = 676 (A) · 485 + 221 = 706 (S) · 306 + 229 = 535 (I) · 518 + 433 = 951 (R) · 421 + 271 = 692 (G) · 307 + 525 = 832 (P) · 386 + 349 = 735 (C) · 147 + 152 = 299 (H) · 106 + 154 = 260 (D)
- Clue 3 (Subtraction): "A TINY SPIDER WILL SCARE THEM AWAY"752 - 266 = 486 (A) · 824 - 280 = 544 (I) · 864 - 375 = 489 (H) · 844 - 23 = 821 (D) · 345 - 17 = 328 (T) · 1069 - 170 = 899 (P) · 489 - 158 = 331 (Y) · 946 - 82 = 864 (R) · 783 - 96 = 687 (S) · 1068 - 302 = 766 (E) · 928 - 376 = 552 (M) · 387 - 136 = 251 (L) · 1054 - 169 = 885 (W) · 351 - 152 = 199 (N) · 435 - 311 = 124 (C)
- Clue 4 (Multiplication facts (1-12)): "A RED BANDANA STRAP WAS LEFT BEHIND"4 × 7 = 28 (A) · 2 × 7 = 14 (T) · 1 × 10 = 10 (D) · 11 × 1 = 11 (N) · 11 × 3 = 33 (B) · 8 × 11 = 88 (F) · 6 × 11 = 66 (H) · 6 × 10 = 60 (P) · 2 × 3 = 6 (E) · 4 × 4 = 16 (L) · 8 × 4 = 32 (W) · 4 × 1 = 4 (S) · 11 × 12 = 132 (I) · 2 × 11 = 22 (R)
- Clue 5 (Division facts (1-12)): surviving statement (box 8) → Mary Read36 ÷ 3 = 12 · 11 ÷ 1 = 11 · 36 ÷ 9 = 4 · 14 ÷ 2 = 7 · 45 ÷ 9 = 5 · 30 ÷ 3 = 10 · 63 ÷ 7 = 9 · 10 ÷ 10 = 1 · 72 ÷ 12 = 6 · 12 ÷ 4 = 3 · 18 ÷ 9 = 2
About this mystery
- Grade level
- Grade 3 math
- Math topics
- Rounding, Addition, Subtraction, Multiplication, Division
- Reading level
- grades 3-4
- Theme
- The Lost Island Map Mystery — set in Scurvy Cove
- Format
- Interactive online & printable worksheet with answer key
- Solution
- One unique, verified culprit among 21 suspects