🦕 DinosaursGrade 3Reading: grades 3-4RoundingWord problemsAdditionSubtractionDivision
The Case of the Missing Meteorite
The museum's prized dinosaur meteorite, the Star Stone, has vanished! A sneaky dino-napper is to blame. Can you crack the case before the sun rises?
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 | Dino Roar | Special Gear | Fossil Footprint | Scale Color | Shiny Object |
|---|---|---|---|---|---|
| Professor Maiasaura | Thunderous Roar | Dino Tracker | Right Footprint | Emerald Scales | Sticky Traps |
| Professor Corythosaurus | Melody Roar | Grappling Hook | Left Footprint | Ruby Scales | Loud Noises |
| Professor Allosaurus | Gale Force Roar | Climbing Claws | Left Footprint | Ruby Scales | Loud Noises |
| Dr. Velociraptor | Sonic Screech | Stealth Suit | Right Footprint | Ruby Scales | Sparkly Things |
| Dr. Iguanodon | Thunderous Roar | Climbing Claws | Left Footprint | Sapphire Scales | Sparkly Things |
| Professor Ankylosaurus | Thunderous Roar | Dino Tracker | Right Footprint | Sapphire Scales | Loud Noises |
| Professor Gallimimus | Melody Roar | Stealth Suit | Left Footprint | Sapphire Scales | Sticky Traps |
| Professor Ornithomimus | Thunderous Roar | Climbing Claws | Right Footprint | Sapphire Scales | Sticky Traps |
| Dr. Carnotaurus | Earthquake Stomp | Climbing Claws | Right Footprint | Sapphire Scales | Sticky Traps |
| Dr. Dimorphodon | Sonic Screech | Net Launcher | Right Footprint | Ruby Scales | Loud Noises |
| Professor Parasaurolophus | Melody Roar | Stealth Suit | Left Footprint | Emerald Scales | Sticky Traps |
| Dr. Euoplocephalus | Earthquake Stomp | Grappling Hook | Right Footprint | Ruby Scales | Loud Noises |
| Dr. Compsognathus | Earthquake Stomp | Climbing Claws | Left Footprint | Sapphire Scales | Sticky Traps |
| Professor Spinosaurus | Sonic Screech | Grappling Hook | Right Footprint | Ruby Scales | Loud Noises |
| Dr. Stego | Gale Force Roar | Dino Tracker | Right Footprint | Emerald Scales | Sticky Traps |
| Dr. Hadrosaurus | Gale Force Roar | Grappling Hook | Right Footprint | Ruby Scales | Loud Noises |
| Professor Pachycephalosaurus | Thunderous Roar | Climbing Claws | Right Footprint | Ruby Scales | Sparkly Things |
| Dr. Rex | Earthquake Stomp | Net Launcher | Right Footprint | Sapphire Scales | Loud Noises |
| Dr. Dilophosaurus | Melody Roar | Climbing Claws | Left Footprint | Emerald Scales | Sticky Traps |
| Dr. Brontosaurus | Sonic Screech | Grappling Hook | Right Footprint | Sapphire Scales | Loud Noises |
| Professor Therizinosaurus | Thunderous Roar | Climbing Claws | Right Footprint | Ruby Scales | Loud Noises |
Clue 1
Rounding
The security camera shows the dino-napper moving past the exhibits. They were carrying a bundle of ropes to climb. The guard tried to grab them, but they slipped away leaving behind their distinctive footprints.
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
20
60
80
90
500
600
200
600
3000
8000
8000
80
6000
7000
80
3000
70
80
300
50
500
5000
300
2000
3000
7000
9000
700
200
200
T
20
8000
6000
500
600
T
20
300
3000
600
90
2000
3000
6000
6000
500
80
300
3000
6000
200
8000
80
T
20
200
2000
7000
500
400
50
Round 16 to the nearest tenT
Round 204 to the nearest hundredO
Round 93 to the nearest tenD
Round 83 to the nearest tenE
Round 477 to the nearest hundredI
Round 2,164 to the nearest thousandC
Round 6,586 to the nearest thousandL
Round 9,227 to the nearest thousandY
Round 66 to the nearest tenV
Round 5,222 to the nearest thousandG
Round 596 to the nearest hundredN
Round 685 to the nearest hundredF
Round 8,193 to the nearest thousandP
Round 61 to the nearest tenH
Round 3,080 to the nearest thousandA
Round 52 to the nearest tenB
Round 373 to the nearest hundredM
Round 278 to the nearest hundredS
Round 5,974 to the nearest thousandR
0/19 letters found
Clue 2
Word problems
A readout from the museum's seismic sensor shows unusual vibrations. It only displays the nearest whole number to the actual reading, making it hard to tell exactly how strong the tremors were.
Solve each problem to learn its letter, then write the letters in the boxes to fill in the missing word.
Awitnesssawthevillainwas .
R
9
37
75
59
27
54
47
47
27
P
R
9
37
N
27
Dino-napper lined up 3 rows of 3 amber. How many amber in all?R
Dino-napper found 25 amber yesterday and 50 more today. How many amber in all?G
Dino-napper found 15 fossil yesterday and 44 more today. How many fossil in all?H
There were 88 egg. 34 were used up. How many egg are left?F
There were 63 amber. 36 were used up. How many amber are left?T
Dino-napper found 26 geode yesterday and 21 more today. How many geode in all?O
There were 47 egg. 10 were used up. How many egg are left?I
0/7 letters found
Clue 3
Addition
The paleontologist was cataloging fossils when the meteorite vanished. They had a pile of ancient fern fronds and a bag of fossilized seeds ready to be counted for a new display.
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
510
628
536
967
297
773
930
773
761
484
484
536
333
281
536
536
738
281
T
510
930
628
761
T
510
536
761
773
356
T
510
628
297
773
503
T
510
628
761
T
510
281
484
761
333
448
467
536
281
186 + 324 =T
318 + 443 =A
241 + 262 =G
111 + 245 =Y
584 + 383 =D
194 + 87 =S
276 + 260 =E
336 + 292 =H
242 + 225 =L
198 + 286 =P
165 + 283 =K
159 + 174 =R
637 + 293 =O
492 + 246 =M
200 + 97 =I
508 + 265 =N
0/16 letters found
Clue 4
Subtraction
A frightened museum patron saw the dino-napper escape through a ventilation shaft. They tried to count how many crates the dino-napper knocked over on their way out, but they were too scared to get a good look.
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
207
649
222
A
207
432
432
174
557
A
207
141
581
557
866
809
A
207
649
730
191
112
557
866
557
382
626
633
866
500
272
764
866
557
382
382
500
649
141
262 - 55 =A
1109 - 300 =W
796 - 239 =E
715 - 134 =H
1018 - 288 =C
791 - 27 =Y
863 - 363 =U
615 - 183 =L
160 - 48 =V
384 - 162 =M
493 - 111 =D
766 - 140 =I
453 - 312 =T
435 - 163 =B
1008 - 375 =N
904 - 38 =R
321 - 130 =O
1010 - 361 =S
303 - 129 =F
0/19 letters found
Clue 5
Division facts (1-12) — the last clue
One of the museum's robotic dinosaur guides was found with its energy cells depleted. It had been trying to share its remaining power with other machines when the incident happened.
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
20 ÷ 5 = ?
28 ÷ 4 = ?
36 ÷ 6 = ?
77 ÷ 7 = ?
24 ÷ 2 = ?
32 ÷ 4 = ?
108 ÷ 12 = ?
10 ÷ 10 = ?
70 ÷ 7 = ?
33 ÷ 11 = ?
45 ÷ 9 = ?
Step 2 — cross out the sentence with each answer
1.The villain covered its tracks, then put on a stealth suit.
2.The villain ran away, then used a grappling hook.
3.The villain grabbed the meteorite, then put on a stealth suit.
4.The villain grabbed the meteorite, then used climbing claws.
5.The villain hid the meteorite, then set a net trap.
6.The villain covered its tracks, then used a grappling hook.
7.The villain stashed the meteorite, then used a grappling hook.
8.The villain covered its tracks, then used climbing claws.
9.The villain hid the meteorite, then used climbing claws.
10.The villain covered its tracks, then set a net trap.
11.The villain grabbed the meteorite, then used a grappling hook.
12.The villain ran away, then activated a dino tracker.
Solve it
Name the culprit
Choose the one suspect left standing.
Answer Key — The Case of the Missing Meteorite
Culprit: Dr. Hadrosaurus (Gale Force Roar · Grappling Hook · Right Footprint · Ruby Scales · Loud Noises)
- Clue 1 (Rounding): "THE DINO NAPPER LEAVES BIG SCALY FOOTPRINTS AND CARRIES A ROPE TO CLIMB"Round 16 to the nearest ten = 20 (T) · Round 204 to the nearest hundred = 200 (O) · Round 93 to the nearest ten = 90 (D) · Round 83 to the nearest ten = 80 (E) · Round 477 to the nearest hundred = 500 (I) · Round 2,164 to the nearest thousand = 2000 (C) · Round 6,586 to the nearest thousand = 7000 (L) · Round 9,227 to the nearest thousand = 9000 (Y) · Round 66 to the nearest ten = 70 (V) · Round 5,222 to the nearest thousand = 5000 (G) · Round 596 to the nearest hundred = 600 (N) · Round 685 to the nearest hundred = 700 (F) · Round 8,193 to the nearest thousand = 8000 (P) · Round 61 to the nearest ten = 60 (H) · Round 3,080 to the nearest thousand = 3000 (A) · Round 52 to the nearest ten = 50 (B) · Round 373 to the nearest hundred = 400 (M) · Round 278 to the nearest hundred = 300 (S) · Round 5,974 to the nearest thousand = 6000 (R)
- Clue 2 (Word problems): "RIGHT FOOTPRINT"Dino-napper lined up 3 rows of 3 amber. How many amber in all? = 9 (R) · Dino-napper found 25 amber yesterday and 50 more today. How many amber in all? = 75 (G) · Dino-napper found 15 fossil yesterday and 44 more today. How many fossil in all? = 59 (H) · There were 88 egg. 34 were used up. How many egg are left? = 54 (F) · There were 63 amber. 36 were used up. How many amber are left? = 27 (T) · Dino-napper found 26 geode yesterday and 21 more today. How many geode in all? = 47 (O) · There were 47 egg. 10 were used up. How many egg are left? = 37 (I)
- Clue 3 (Addition): "THE DINO NAPPER SEEMS TO HATE ANYTHING THAT SPARKLES"186 + 324 = 510 (T) · 318 + 443 = 761 (A) · 241 + 262 = 503 (G) · 111 + 245 = 356 (Y) · 584 + 383 = 967 (D) · 194 + 87 = 281 (S) · 276 + 260 = 536 (E) · 336 + 292 = 628 (H) · 242 + 225 = 467 (L) · 198 + 286 = 484 (P) · 165 + 283 = 448 (K) · 159 + 174 = 333 (R) · 637 + 293 = 930 (O) · 492 + 246 = 738 (M) · 200 + 97 = 297 (I) · 508 + 265 = 773 (N)
- Clue 4 (Subtraction): "A SMALL FEATHER WAS COVERED IN RUBY RED DUST"262 - 55 = 207 (A) · 1109 - 300 = 809 (W) · 796 - 239 = 557 (E) · 715 - 134 = 581 (H) · 1018 - 288 = 730 (C) · 791 - 27 = 764 (Y) · 863 - 363 = 500 (U) · 615 - 183 = 432 (L) · 160 - 48 = 112 (V) · 384 - 162 = 222 (M) · 493 - 111 = 382 (D) · 766 - 140 = 626 (I) · 453 - 312 = 141 (T) · 435 - 163 = 272 (B) · 1008 - 375 = 633 (N) · 904 - 38 = 866 (R) · 321 - 130 = 191 (O) · 1010 - 361 = 649 (S) · 303 - 129 = 174 (F)
- Clue 5 (Division facts (1-12)): surviving statement (box 2) → Dr. Hadrosaurus20 ÷ 5 = 4 · 28 ÷ 4 = 7 · 36 ÷ 6 = 6 · 77 ÷ 7 = 11 · 24 ÷ 2 = 12 · 32 ÷ 4 = 8 · 108 ÷ 12 = 9 · 10 ÷ 10 = 1 · 70 ÷ 7 = 10 · 33 ÷ 11 = 3 · 45 ÷ 9 = 5
About this mystery
- Grade level
- Grade 3 math
- Math topics
- Rounding, Word problems, Addition, Subtraction, Division
- Reading level
- grades 3-4
- Theme
- The Case of the Missing Meteorite — set in The Mesozoic Museum of Mysteries, where dinosaur fossils come to life after dark!
- Format
- Interactive online & printable worksheet with answer key
- Solution
- One unique, verified culprit among 21 suspects