🏎️ Monster truck demolition derGrade 4Reading: grades 3-4RoundingAdditionSubtractionMultiplicationDivision
The Case of the Missing Golden Hubcap
Welcome to the Monster Smash Derby! Just before the grand finale, someone drove a giant truck straight into the tool shed and stole the Golden Hubcap trophy! Rex, the Head Mechanic, needs you to track down the sneaky driver who ruined the arena's big night.
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 | Truck Decal | Driver Voice | Helmet Design | Truck Squeak |
|---|---|---|---|---|---|
| Spike Sally | Mud Spray | Shark Teeth | Girl | Flame Helmet | Loose Muffler |
| Digger Daisy | Donut Drift | Flame Decals | Boy | Flame Helmet | Squeaky Brake |
| Axle Abby | Tail Whip | Lightning Bolts | Boy | Star Helmet | Squeaky Brake |
| Wrecker Will | High Jump | Lightning Bolts | Girl | Star Helmet | Rattling Hood |
| Skid Shelby | Donut Drift | Shark Teeth | Boy | Flame Helmet | Loose Muffler |
| Piston Pete | Tire Spin | Shark Teeth | Boy | Flame Helmet | Loose Muffler |
| Nitro Ned | High Jump | Flame Decals | Girl | Flame Helmet | Squeaky Brake |
| Jolt Johnny | Donut Drift | Lightning Bolts | Girl | Star Helmet | Squeaky Brake |
| Crusher Cody | Tail Whip | Star Stickers | Girl | Star Helmet | Squeaky Brake |
| Buster Bumper | High Jump | Skull Badges | Girl | Star Helmet | Rattling Hood |
| Rumble Ruby | Tail Whip | Shark Teeth | Boy | Striped Helmet | Loose Muffler |
| Blaze Bobbi | Tire Spin | Flame Decals | Girl | Star Helmet | Squeaky Brake |
| Gears Garry | Donut Drift | Star Stickers | Boy | Flame Helmet | Loose Muffler |
| Rocky Rex | Donut Drift | Lightning Bolts | Girl | Flame Helmet | Loose Muffler |
| Slammin Sam | Mud Spray | Skull Badges | Boy | Star Helmet | Rattling Hood |
| Speedy Spud | Mud Spray | Shark Teeth | Boy | Flame Helmet | Loose Muffler |
| Revving Rita | Mud Spray | Star Stickers | Boy | Flame Helmet | Squeaky Brake |
| Chassis Chip | Mud Spray | Star Stickers | Girl | Star Helmet | Squeaky Brake |
| Turbo Tara | Donut Drift | Flame Decals | Boy | Flame Helmet | Loose Muffler |
| Dash Derby | Mud Spray | Shark Teeth | Boy | Star Helmet | Squeaky Brake |
| Traction Tom | Tail Whip | Star Stickers | Girl | Flame Helmet | Loose Muffler |
Clue 1
Rounding
The radar gun caught the rogue truck's speed. The screen only shows rounded tens, but rounding the number helps us guess the driver's decal!
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
2000
4700
280000
140000
470
50
700000
280000
470
140000
500
280000
500000
70000
500
T
2000
30000
500000
280000
140
1400
70
2800
280000
140000
280000
20000
70
1400
500000
Round 1,629 to the nearest thousandT
Round 32,487 to the nearest ten thousandU
Round 1,420 to the nearest hundredL
Round 486,315 to the nearest hundred thousandS
Round 506 to the nearest hundredO
Round 50 to the nearest tenI
Round 278,685 to the nearest ten thousandE
Round 74,993 to the nearest ten thousandN
Round 661,863 to the nearest hundred thousandV
Round 2,817 to the nearest hundredM
Round 139 to the nearest tenF
Round 23,242 to the nearest ten thousandC
Round 68 to the nearest tenA
Round 469 to the nearest tenR
Round 4,659 to the nearest hundredH
Round 141,270 to the nearest ten thousandD
0/16 letters found
Clue 2
Addition
The pit crew added up the total number of crushed soda cans left behind by the suspect. Adding these scraps gives us the driver's gender!
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
5723
4588
8322
9405
8505
A
5723
6000
6000
4107
8322
5516
5516
7243
3785
A
5723
5516
5516
2142
7243
8505
2142
7243
7243
6911
3043 + 2680 =A
5117 + 4288 =Y
3307 + 5198 =W
2545 + 1562 =P
2633 + 1152 =D
4600 + 2311 =L
2630 + 3370 =S
3517 + 1999 =T
2409 + 4834 =E
4996 + 3326 =O
1102 + 1040 =H
2884 + 1704 =B
0/12 letters found
Clue 3
Subtraction
We checked the spare tire rack. Subtracting the missing wheels from our starting pile tells us which squeak to listen for!
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
8343
4554
4742
4616
5024
3408
3738
4616
5024
5024
7388
4742
7109
3408
4521
4521
4616
4742
4720
7109
8947
3738
4742
8947
6952
4616
8947
3509
4610
9954 - 1611 =T
7752 - 4243 =N
5995 - 1379 =L
7839 - 730 =M
9038 - 4318 =R
9087 - 4345 =E
11678 - 4290 =S
8479 - 3925 =H
6944 - 1920 =O
5487 - 2079 =U
13366 - 4419 =A
8778 - 1826 =C
7221 - 2611 =K
5786 - 1265 =F
8055 - 4317 =D
0/15 letters found
Clue 4
Multiplication facts (1-12)
We found rows of muddy tire tracks outside the shed. Multiplying the number of rows by the tracks in each row reveals the helmet design!
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
45
6
40
A
45
81
11
44
11
40
81
11
16
33
A
45
50
40
11
6
16
14
20
16
44
11
81
18
21
5 × 9 =A
8 × 5 =L
2 × 7 =I
11 × 3 =W
9 × 9 =M
11 × 1 =E
11 × 4 =H
5 × 10 =S
2 × 8 =T
1 × 6 =F
5 × 4 =N
3 × 7 =D
3 × 6 =U
0/13 letters found
Clue 5
Division facts (1-12) — the last clue
The suspect split up their stolen fuel cans among the escape ramps. Dividing the total cans equally points us to the final driver!
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
6 ÷ 6 = ?
5 ÷ 1 = ?
16 ÷ 4 = ?
60 ÷ 10 = ?
24 ÷ 3 = ?
27 ÷ 9 = ?
35 ÷ 5 = ?
6 ÷ 3 = ?
27 ÷ 3 = ?
60 ÷ 5 = ?
99 ÷ 9 = ?
Step 2 — cross out the sentence with each answer
1.The villain drifted a perfect donut drift, then chomped past with painted shark teeth.
2.The villain whacked a fence with a tail whip, then roared off showing scary skull badges.
3.The villain spun a wild tire spin, then blazed away with bright flame decals.
4.The villain drifted a perfect donut drift, then shined brightly with gold star stickers.
5.The villain spun a wild tire spin, then chomped past with painted shark teeth.
6.The villain drifted a perfect donut drift, then blazed away with bright flame decals.
7.The villain shot a giant mud spray, then shined brightly with gold star stickers.
8.The villain shot a giant mud spray, then blazed away with bright flame decals.
9.The villain whacked a fence with a tail whip, then blazed away with bright flame decals.
10.The villain shot a giant mud spray, then chomped past with painted shark teeth.
11.The villain whacked a fence with a tail whip, then chomped past with painted shark teeth.
12.The villain did a massive high jump, then zoomed off with flashing lightning bolts.
Solve it
Name the culprit
Choose the one suspect left standing.
Answer Key — The Case of the Missing Golden Hubcap
Culprit: Speedy Spud (Mud Spray · Shark Teeth · Boy · Flame Helmet · Loose Muffler)
- Clue 1 (Rounding): "THE DRIVER DOES NOT USE FLAME DECALS"Round 1,629 to the nearest thousand = 2000 (T) · Round 32,487 to the nearest ten thousand = 30000 (U) · Round 1,420 to the nearest hundred = 1400 (L) · Round 486,315 to the nearest hundred thousand = 500000 (S) · Round 506 to the nearest hundred = 500 (O) · Round 50 to the nearest ten = 50 (I) · Round 278,685 to the nearest ten thousand = 280000 (E) · Round 74,993 to the nearest ten thousand = 70000 (N) · Round 661,863 to the nearest hundred thousand = 700000 (V) · Round 2,817 to the nearest hundred = 2800 (M) · Round 139 to the nearest ten = 140 (F) · Round 23,242 to the nearest ten thousand = 20000 (C) · Round 68 to the nearest ten = 70 (A) · Round 469 to the nearest ten = 470 (R) · Round 4,659 to the nearest hundred = 4700 (H) · Round 141,270 to the nearest ten thousand = 140000 (D)
- Clue 2 (Addition): "A BOY WAS SPOTTED AT THE WHEEL"3043 + 2680 = 5723 (A) · 5117 + 4288 = 9405 (Y) · 3307 + 5198 = 8505 (W) · 2545 + 1562 = 4107 (P) · 2633 + 1152 = 3785 (D) · 4600 + 2311 = 6911 (L) · 2630 + 3370 = 6000 (S) · 3517 + 1999 = 5516 (T) · 2409 + 4834 = 7243 (E) · 4996 + 3326 = 8322 (O) · 1102 + 1040 = 2142 (H) · 2884 + 1704 = 4588 (B)
- Clue 3 (Subtraction): "THE LOUD LOOSE MUFFLER MADE A CLANK"9954 - 1611 = 8343 (T) · 7752 - 4243 = 3509 (N) · 5995 - 1379 = 4616 (L) · 7839 - 730 = 7109 (M) · 9038 - 4318 = 4720 (R) · 9087 - 4345 = 4742 (E) · 11678 - 4290 = 7388 (S) · 8479 - 3925 = 4554 (H) · 6944 - 1920 = 5024 (O) · 5487 - 2079 = 3408 (U) · 13366 - 4419 = 8947 (A) · 8778 - 1826 = 6952 (C) · 7221 - 2611 = 4610 (K) · 5786 - 1265 = 4521 (F) · 8055 - 4317 = 3738 (D)
- Clue 4 (Multiplication facts (1-12)): "A FLAME HELMET WAS LEFT IN THE MUD"5 × 9 = 45 (A) · 8 × 5 = 40 (L) · 2 × 7 = 14 (I) · 11 × 3 = 33 (W) · 9 × 9 = 81 (M) · 11 × 1 = 11 (E) · 11 × 4 = 44 (H) · 5 × 10 = 50 (S) · 2 × 8 = 16 (T) · 1 × 6 = 6 (F) · 5 × 4 = 20 (N) · 3 × 7 = 21 (D) · 3 × 6 = 18 (U)
- Clue 5 (Division facts (1-12)): surviving statement (box 10) → Speedy Spud6 ÷ 6 = 1 · 5 ÷ 1 = 5 · 16 ÷ 4 = 4 · 60 ÷ 10 = 6 · 24 ÷ 3 = 8 · 27 ÷ 9 = 3 · 35 ÷ 5 = 7 · 6 ÷ 3 = 2 · 27 ÷ 3 = 9 · 60 ÷ 5 = 12 · 99 ÷ 9 = 11
About this mystery
- Grade level
- Grade 4 math
- Math topics
- Rounding, Addition, Subtraction, Multiplication, Division
- Reading level
- grades 3-4
- Theme
- The Case of the Missing Golden Hubcap — set in The Mud-Slinging Arena
- Format
- Interactive online & printable worksheet with answer key
- Solution
- One unique, verified culprit among 21 suspects