🦁 Interesting animals like KiwGrade 3Reading: grades 3-4RoundingAdditionSubtractionMultiplicationDivision
The Great Lagoon Heist
The sanctuary is in an uproar! Someone has snuck into the safe and taken the golden kelp seed. The local rangers need your help to trace the tracks and find the culprit before they swim away!
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 | Signature Move | Secret Tool | Watch Wrist | Gill or Feather Color | Snooze Trigger |
|---|---|---|---|---|---|
| Jacques Cousteau | super fast swim | golden compass | left wrist watch | bright pink gills | very loud noise |
| Dr Jane Goodall | super fast swim | kelp cloak | right wrist watch | shiny blue scales | bright flashing light |
| Ranger Steve | mud excavation | kelp cloak | left wrist watch | fuzzy brown down | super cold water |
| Toby Tadpole | electric bubble blast | kelp cloak | left wrist watch | bright pink gills | super cold water |
| Finn Riverton | water cannon splash | kelp cloak | left wrist watch | bright pink gills | super cold water |
| Pippa Platypus | super fast swim | golden compass | left wrist watch | shiny blue scales | very loud noise |
| Darwin Finch | sparkling sonar | neon snorkel | left wrist watch | shiny blue scales | super cold water |
| Ranger Rita | mud excavation | neon snorkel | left wrist watch | shiny blue scales | very loud noise |
| Waddles McGee | water cannon splash | kelp cloak | right wrist watch | shiny blue scales | bright flashing light |
| Bindi Irwin | super fast swim | flipper boots | right wrist watch | bright pink gills | very loud noise |
| Splashy Sam | water cannon splash | kelp cloak | right wrist watch | shiny blue scales | very loud noise |
| Sally Salamander | sparkling sonar | glowing lantern | left wrist watch | shiny blue scales | very loud noise |
| Narwhal Ned | mud excavation | golden compass | left wrist watch | bright pink gills | very loud noise |
| Sylvia Earle | super fast swim | glowing lantern | left wrist watch | shiny blue scales | bright flashing light |
| Ranger Rick | super fast swim | golden compass | left wrist watch | bright pink gills | bright flashing light |
| Manatee Manny | sparkling sonar | glowing lantern | left wrist watch | shiny blue scales | bright flashing light |
| Platypus Pete | super fast swim | flipper boots | left wrist watch | shiny blue scales | very loud noise |
| Sandy Shore | super fast swim | kelp cloak | left wrist watch | shiny blue scales | very loud noise |
| Axolotl Annie | sparkling sonar | golden compass | right wrist watch | bright pink gills | super cold water |
| Wally Waterdog | mud excavation | neon snorkel | left wrist watch | shiny blue scales | bright flashing light |
| David Attenborough | water cannon splash | golden compass | right wrist watch | fuzzy brown down | very loud noise |
Clue 1
Rounding
We check the digital sonar screen. The distance numbers are always rounded to the nearest ten. Rounding the signals gives us our first 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.
T
700
5000
300
60
80
8000
8000
50
80
3000
2000
400
300
90
3000
400
T
700
500
300
50
600
900
8000
80
4000
4000
300
600
20
400
400
T
700
90
Round 734 to the nearest hundredT
Round 1,960 to the nearest thousandD
Round 18 to the nearest tenB
Round 61 to the nearest tenV
Round 5,149 to the nearest thousandH
Round 528 to the nearest hundredW
Round 94 to the nearest tenS
Round 410 to the nearest hundredO
Round 642 to the nearest hundredR
Round 905 to the nearest hundredF
Round 4,125 to the nearest thousandP
Round 79 to the nearest tenI
Round 8,036 to the nearest thousandL
Round 49 to the nearest tenA
Round 3,320 to the nearest thousandN
Round 334 to the nearest hundredE
0/16 letters found
Clue 2
Addition
The ranger tallies the stray footprints on the muddy path. Adding these tracks together reveals another piece of the puzzle.
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
453
571
836
356
282
928
563
445
394
T
453
966
836
567
445
898
567
966
567
T
453
356
571
507
546
T
453
571
836
928
836
675
T
453
966
445
394
898
T
453
164 + 289 =T
392 + 171 =P
273 + 273 =N
101 + 181 =U
176 + 180 =C
382 + 293 =F
266 + 570 =E
433 + 533 =W
330 + 237 =A
259 + 186 =R
465 + 433 =S
480 + 448 =L
267 + 240 =O
360 + 211 =H
148 + 246 =I
0/15 letters found
Clue 3
Subtraction
The thief dropped some stolen supplies. We count the starting pile and subtract what is left behind to find the difference.
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
293
240
464
206
545
519
617
255
401
272
617
230
252
464
252
120
617
564
252
120
721
464
674
687
617
519
401
541 - 248 =A
122 - 2 =T
272 - 66 =R
798 - 253 =Y
775 - 54 =H
518 - 278 =V
620 - 219 =D
272 - 42 =I
637 - 118 =L
412 - 157 =U
580 - 116 =E
740 - 176 =P
733 - 46 =C
467 - 195 =N
661 - 44 =O
683 - 9 =M
334 - 82 =S
0/17 letters found
Clue 4
Multiplication facts (1-12)
We inspect the glowing egg chambers. They are organized in equal rows. Multiplying the rows gives us a code to unlock a secret file.
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
50
28
55
42
9
121
44
21
16
25
121
45
88
108
9
28
21
5
35
108
28
21
35
36
36
16
28
21
5
28
121
28
10 × 5 =W
5 × 7 =A
5 × 11 =F
5 × 1 =C
9 × 1 =U
4 × 11 =D
4 × 4 =H
5 × 5 =I
11 × 8 =B
7 × 3 =S
6 × 7 =O
9 × 5 =Y
7 × 4 =E
11 × 11 =N
9 × 12 =L
3 × 12 =T
0/16 letters found
Clue 5
Division facts (1-12) — the last clue
The baby axolotls need to be split into equal swimming teams. Dividing them up fairly unlocks the final mystery clue.
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
56 ÷ 8 = ?
40 ÷ 5 = ?
10 ÷ 5 = ?
42 ÷ 7 = ?
15 ÷ 5 = ?
36 ÷ 9 = ?
20 ÷ 4 = ?
11 ÷ 11 = ?
48 ÷ 4 = ?
120 ÷ 12 = ?
33 ÷ 3 = ?
Step 2 — cross out the sentence with each answer
1.The villain shocks the lock with an electric bubble blast, then lights the dark tunnel with a glowing lantern.
2.The villain uses sparkling sonar to find the safe, then lights the dark tunnel with a glowing lantern.
3.The villain breaks the gate with a water cannon splash, then runs across the beach in flipper boots.
4.The villain breaks the gate with a water cannon splash, then escapes using a neon snorkel.
5.The villain digs through the floor with mud excavation, then navigates the swamp with a golden compass.
6.The villain breaks the gate with a water cannon splash, then hides in the shadows wearing a kelp cloak.
7.The villain races past the guards using super fast swim, then hides in the shadows wearing a kelp cloak.
8.The villain races past the guards using super fast swim, then navigates the swamp with a golden compass.
9.The villain digs through the floor with mud excavation, then escapes using a neon snorkel.
10.The villain uses sparkling sonar to find the safe, then runs across the beach in flipper boots.
11.The villain shocks the lock with an electric bubble blast, then hides in the shadows wearing a kelp cloak.
12.The villain uses sparkling sonar to find the safe, then hides in the shadows wearing a kelp cloak.
Solve it
Name the culprit
Choose the one suspect left standing.
Answer Key — The Great Lagoon Heist
Culprit: Ranger Rita (mud excavation · neon snorkel · left wrist watch · shiny blue scales · very loud noise)
- Clue 1 (Rounding): "THE VILLAIN DOES NOT WEAR FLIPPER BOOTS"Round 734 to the nearest hundred = 700 (T) · Round 1,960 to the nearest thousand = 2000 (D) · Round 18 to the nearest ten = 20 (B) · Round 61 to the nearest ten = 60 (V) · Round 5,149 to the nearest thousand = 5000 (H) · Round 528 to the nearest hundred = 500 (W) · Round 94 to the nearest ten = 90 (S) · Round 410 to the nearest hundred = 400 (O) · Round 642 to the nearest hundred = 600 (R) · Round 905 to the nearest hundred = 900 (F) · Round 4,125 to the nearest thousand = 4000 (P) · Round 79 to the nearest ten = 80 (I) · Round 8,036 to the nearest thousand = 8000 (L) · Round 49 to the nearest ten = 50 (A) · Round 3,320 to the nearest thousand = 3000 (N) · Round 334 to the nearest hundred = 300 (E)
- Clue 2 (Addition): "THE CULPRIT WEARS A WATCH ON THE LEFT WRIST"164 + 289 = 453 (T) · 392 + 171 = 563 (P) · 273 + 273 = 546 (N) · 101 + 181 = 282 (U) · 176 + 180 = 356 (C) · 382 + 293 = 675 (F) · 266 + 570 = 836 (E) · 433 + 533 = 966 (W) · 330 + 237 = 567 (A) · 259 + 186 = 445 (R) · 465 + 433 = 898 (S) · 480 + 448 = 928 (L) · 267 + 240 = 507 (O) · 360 + 211 = 571 (H) · 148 + 246 = 394 (I)
- Clue 3 (Subtraction): "A VERY LOUD NOISE STOPS THEM COLD"541 - 248 = 293 (A) · 122 - 2 = 120 (T) · 272 - 66 = 206 (R) · 798 - 253 = 545 (Y) · 775 - 54 = 721 (H) · 518 - 278 = 240 (V) · 620 - 219 = 401 (D) · 272 - 42 = 230 (I) · 637 - 118 = 519 (L) · 412 - 157 = 255 (U) · 580 - 116 = 464 (E) · 740 - 176 = 564 (P) · 733 - 46 = 687 (C) · 467 - 195 = 272 (N) · 661 - 44 = 617 (O) · 683 - 9 = 674 (M) · 334 - 82 = 252 (S)
- Clue 4 (Multiplication facts (1-12)): "WE FOUND SHINY BLUE SCALES AT THE SCENE"10 × 5 = 50 (W) · 5 × 7 = 35 (A) · 5 × 11 = 55 (F) · 5 × 1 = 5 (C) · 9 × 1 = 9 (U) · 4 × 11 = 44 (D) · 4 × 4 = 16 (H) · 5 × 5 = 25 (I) · 11 × 8 = 88 (B) · 7 × 3 = 21 (S) · 6 × 7 = 42 (O) · 9 × 5 = 45 (Y) · 7 × 4 = 28 (E) · 11 × 11 = 121 (N) · 9 × 12 = 108 (L) · 3 × 12 = 36 (T)
- Clue 5 (Division facts (1-12)): surviving statement (box 9) → Ranger Rita56 ÷ 8 = 7 · 40 ÷ 5 = 8 · 10 ÷ 5 = 2 · 42 ÷ 7 = 6 · 15 ÷ 5 = 3 · 36 ÷ 9 = 4 · 20 ÷ 4 = 5 · 11 ÷ 11 = 1 · 48 ÷ 4 = 12 · 120 ÷ 12 = 10 · 33 ÷ 3 = 11
About this mystery
- Grade level
- Grade 3 math
- Math topics
- Rounding, Addition, Subtraction, Multiplication, Division
- Reading level
- grades 3-4
- Theme
- The Great Lagoon Heist — set in The Sanctuary of Strange Critters
- Format
- Interactive online & printable worksheet with answer key
- Solution
- One unique, verified culprit among 21 suspects