🔎 MonsterGrade 4Reading: grades 3-4RoundingAdditionSubtractionMultiplicationDivision
The Great Pumpkin Cake Mystery
Oh no! Creepwood Academy is in an uproar. Someone snuck into the cafeteria and ate Chef Gloop's giant Pumpkin Cake! It was supposed to be the dessert for the monster party tonight. Inspector Ghoul is on the case to find out which young monster did it.
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 | Scary Skill | Special Ability | Active Claw | Fur Color | Fear |
|---|---|---|---|---|---|
| Zombie | Super jumping | Wall climbing | Right clawed | Green fur | Cold water |
| Ghoul | Fire breathing | Steel claws | Right clawed | Purple fur | Cold water |
| Gorgon | Sonic howling | Wall climbing | Right clawed | Orange fur | Bright light |
| Chupacabra | Super jumping | Horn glowing | Right clawed | Green fur | Cold water |
| Goblin | Slime trailing | Steel claws | Left clawed | Green fur | Loud bells |
| Yeti | Fire breathing | Night vision | Right clawed | Purple fur | Cold water |
| Pixie | Super jumping | Steel claws | Right clawed | Green fur | Loud bells |
| Wolfie | Fire breathing | Horn glowing | Right clawed | Purple fur | Cold water |
| Kraken | Sonic howling | Spike shooting | Right clawed | Purple fur | Cold water |
| Dracula | Super jumping | Wall climbing | Left clawed | Purple fur | Cold water |
| Cyclops | Slime trailing | Spike shooting | Right clawed | Purple fur | Loud bells |
| Hydra | Shadow blending | Night vision | Left clawed | Orange fur | Loud bells |
| Minotaur | Sonic howling | Spike shooting | Left clawed | Orange fur | Cold water |
| Griffin | Super jumping | Night vision | Right clawed | Purple fur | Cold water |
| Bigfoot | Super jumping | Wall climbing | Left clawed | Purple fur | Bright light |
| Banshee | Fire breathing | Wall climbing | Left clawed | Green fur | Cold water |
| Frankie | Fire breathing | Spike shooting | Left clawed | Green fur | Bright light |
| Nessie | Shadow blending | Spike shooting | Left clawed | Orange fur | Bright light |
| Orc | Shadow blending | Night vision | Left clawed | Purple fur | Cold water |
| Gremlin | Sonic howling | Steel claws | Left clawed | Green fur | Bright light |
| Basilisk | Sonic howling | Steel claws | Right clawed | Purple fur | Loud bells |
Clue 1
Rounding
The school radar tracks heavy footprints. It rounds the number of steps to the nearest ten. Round the radar reading to find the 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
230
90
1100
20
200
900
T
230
290
90
1100
3000
4300
170
1100
20
200
170
T
230
20
90
170
170
T
230
20
500
70
370
1100
20
Round 227 to the nearest tenT
Round 366 to the nearest tenK
Round 67 to the nearest tenI
Round 89 to the nearest tenH
Round 287 to the nearest tenC
Round 458 to the nearest hundredP
Round 24 to the nearest tenS
Round 4,286 to the nearest hundredD
Round 197 to the nearest hundredN
Round 931 to the nearest hundredA
Round 168 to the nearest tenO
Round 1,055 to the nearest hundredE
Round 2,821 to the nearest thousandR
0/13 letters found
Clue 2
Addition
We found muddy claw marks in the hallway. Add up the marks on each floor tile to reveal the next piece of evidence.
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
2773
8307
2702
9414
4789
7310
4673
3048
2141
5449
3048
R
2773
5283
2294
2141
5499
R
2773
5499
2295
5896
7217
9504
2802
3048
4789
4789
9414
5499
2802
5896
5896
R
2773
1242 + 1531 =R
1366 + 929 =F
2704 + 2579 =K
2084 + 964 =A
1009 + 1693 =G
3174 + 4043 =U
1007 + 1795 =D
2754 + 5553 =I
693 + 1448 =W
4009 + 5405 =H
2197 + 3699 =O
3046 + 2453 =E
2544 + 2245 =T
3042 + 2407 =M
1399 + 895 =S
4927 + 4577 =N
2771 + 4539 =C
2589 + 2084 =L
0/18 letters found
Clue 3
Subtraction
The kitchen freezer got much colder after the thief entered. Subtract the new temperature from the old one to unlock this 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
4497
7407
8021
1102
8021
3461
8324
T
4497
2535
3461
7762
3461
3232
3461
8686
4720
2535
3155
5812
6387
3155
7371
1641
3232
3461
T
4497
8021
2535
7952 - 3455 =T
9336 - 1929 =H
10765 - 2744 =E
3509 - 48 =A
6161 - 4520 =D
9010 - 3198 =M
3055 - 520 =R
7944 - 3224 =F
10465 - 4078 =C
11433 - 2747 =Y
3780 - 625 =O
7027 - 3795 =W
4401 - 3299 =B
12188 - 4817 =L
12377 - 4615 =N
13253 - 4929 =S
0/16 letters found
Clue 4
Multiplication facts (1-12)
The monster ran through a field of glowing mushrooms. Solve this multiplication problem to count the squished rows and find a 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.
W
110
22
64
70
3
90
55
1
3
33
1
49
22
64
3
33
63
90
100
27
22
60
63
100
77
27
22
90
11 × 10 =W
10 × 10 =T
3 × 11 =R
8 × 8 =F
11 × 5 =D
7 × 7 =L
7 × 10 =O
9 × 3 =H
9 × 10 =N
6 × 10 =K
1 × 1 =P
9 × 7 =I
1 × 3 =U
2 × 11 =E
7 × 11 =C
0/15 letters found
Clue 5
Division facts (1-12) — the last clue
The detective squad needs to share their magnifying glasses equally. Divide the gear to get the final 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
45 ÷ 5 = ?
90 ÷ 9 = ?
48 ÷ 8 = ?
1 ÷ 1 = ?
8 ÷ 4 = ?
32 ÷ 4 = ?
32 ÷ 8 = ?
9 ÷ 3 = ?
35 ÷ 7 = ?
132 ÷ 12 = ?
108 ÷ 9 = ?
Step 2 — cross out the sentence with each answer
1.The villain howled a loud sonic boom, then scratched the floor with steel claws.
2.The villain breathed fire on the oven, then climbed up the brick wall.
3.The villain howled a loud sonic boom, then shot spikes into the target.
4.The villain left a sticky slime trail, then climbed up the brick wall.
5.The villain blended into the shadows, then used night vision to see.
6.The villain breathed fire on the oven, then used night vision to see.
7.The villain breathed fire on the oven, then scratched the floor with steel claws.
8.The villain blended into the shadows, then lit up the room with a glowing horn.
9.The villain breathed fire on the oven, then lit up the room with a glowing horn.
10.The villain jumped over the high wall, then used night vision to see.
11.The villain howled a loud sonic boom, then used night vision to see.
12.The villain breathed fire on the oven, then shot spikes into the target.
Solve it
Name the culprit
Choose the one suspect left standing.
Answer Key — The Great Pumpkin Cake Mystery
Culprit: Ghoul (Fire breathing · Steel claws · Right clawed · Purple fur · Cold water)
- Clue 1 (Rounding): "THE SNATCHER DOES NOT SHOOT SPIKES"Round 227 to the nearest ten = 230 (T) · Round 366 to the nearest ten = 370 (K) · Round 67 to the nearest ten = 70 (I) · Round 89 to the nearest ten = 90 (H) · Round 287 to the nearest ten = 290 (C) · Round 458 to the nearest hundred = 500 (P) · Round 24 to the nearest ten = 20 (S) · Round 4,286 to the nearest hundred = 4300 (D) · Round 197 to the nearest hundred = 200 (N) · Round 931 to the nearest hundred = 900 (A) · Round 168 to the nearest ten = 170 (O) · Round 1,055 to the nearest hundred = 1100 (E) · Round 2,821 to the nearest thousand = 3000 (R)
- Clue 2 (Addition): "RIGHT CLAW MARKS WERE FOUND AT THE DOOR"1242 + 1531 = 2773 (R) · 1366 + 929 = 2295 (F) · 2704 + 2579 = 5283 (K) · 2084 + 964 = 3048 (A) · 1009 + 1693 = 2702 (G) · 3174 + 4043 = 7217 (U) · 1007 + 1795 = 2802 (D) · 2754 + 5553 = 8307 (I) · 693 + 1448 = 2141 (W) · 4009 + 5405 = 9414 (H) · 2197 + 3699 = 5896 (O) · 3046 + 2453 = 5499 (E) · 2544 + 2245 = 4789 (T) · 3042 + 2407 = 5449 (M) · 1399 + 895 = 2294 (S) · 4927 + 4577 = 9504 (N) · 2771 + 4539 = 7310 (C) · 2589 + 2084 = 4673 (L)
- Clue 3 (Subtraction): "THE BEAST RAN AWAY FROM COLD WATER"7952 - 3455 = 4497 (T) · 9336 - 1929 = 7407 (H) · 10765 - 2744 = 8021 (E) · 3509 - 48 = 3461 (A) · 6161 - 4520 = 1641 (D) · 9010 - 3198 = 5812 (M) · 3055 - 520 = 2535 (R) · 7944 - 3224 = 4720 (F) · 10465 - 4078 = 6387 (C) · 11433 - 2747 = 8686 (Y) · 3780 - 625 = 3155 (O) · 7027 - 3795 = 3232 (W) · 4401 - 3299 = 1102 (B) · 12188 - 4817 = 7371 (L) · 12377 - 4615 = 7762 (N) · 13253 - 4929 = 8324 (S)
- Clue 4 (Multiplication facts (1-12)): "WE FOUND PURPLE FUR IN THE KITCHEN"11 × 10 = 110 (W) · 10 × 10 = 100 (T) · 3 × 11 = 33 (R) · 8 × 8 = 64 (F) · 11 × 5 = 55 (D) · 7 × 7 = 49 (L) · 7 × 10 = 70 (O) · 9 × 3 = 27 (H) · 9 × 10 = 90 (N) · 6 × 10 = 60 (K) · 1 × 1 = 1 (P) · 9 × 7 = 63 (I) · 1 × 3 = 3 (U) · 2 × 11 = 22 (E) · 7 × 11 = 77 (C)
- Clue 5 (Division facts (1-12)): surviving statement (box 7) → Ghoul45 ÷ 5 = 9 · 90 ÷ 9 = 10 · 48 ÷ 8 = 6 · 1 ÷ 1 = 1 · 8 ÷ 4 = 2 · 32 ÷ 4 = 8 · 32 ÷ 8 = 4 · 9 ÷ 3 = 3 · 35 ÷ 7 = 5 · 132 ÷ 12 = 11 · 108 ÷ 9 = 12
About this mystery
- Grade level
- Grade 4 math
- Math topics
- Rounding, Addition, Subtraction, Multiplication, Division
- Reading level
- grades 3-4
- Theme
- The Great Pumpkin Cake Mystery — set in Creepwood Academy for Friendly Monsters
- Format
- Interactive online & printable worksheet with answer key
- Solution
- One unique, verified culprit among 21 suspects