Math Mysteries
🎨 FartfaceGrade 4Reading: grades 3-4RoundingAdditionSubtractionMultiplicationDivision

The Case of the Smelly-Sock Bandit

Oh no! Someone blasted a mega-stinky cloud and stole the Golden Nose trophy from the vault. The only clue left behind is a giant, silly face drawn on the chalkboard. We need to find which student is the real 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
NameGas BlastFace TrickClass TypeHair StyleScent Block
Penny Puffrotten egg blastdouble chin wigglegassy boyfrizzy purple curlsripe strawberry mist
Nora Nosesour garbage burpcrossed eye staregassy boyfrizzy purple curlssweet lavender perfume
Gary Gasburnt popcorn fogeyebrow wiggle dancegassy girlneon green spikessweet lavender perfume
Toby Trudmoldy cheese cloudcrossed eye staregassy girlslimy orange mohawkfresh peppermint spray
Benny Blowsour garbage burpeyebrow wiggle dancegassy girlneon green spikessweet lavender perfume
Fiona Fartrotten egg blasteyebrow wiggle dancegassy girlslimy orange mohawksweet lavender perfume
Wendy Windsour garbage burptongue stick outgassy boyneon green spikessweet lavender perfume
Molly Moldysour garbage burptongue stick outgassy girlslimy orange mohawksweet lavender perfume
Pip Phewsour garbage burpcrossed eye staregassy boyslimy orange mohawksweet lavender perfume
Billy Belchrotten egg blastcheek balloon popgassy girlfrizzy purple curlsripe strawberry mist
Sammy Stinkburnt popcorn fogeyebrow wiggle dancegassy boyfrizzy purple curlsfresh peppermint spray
Barney Bubblesour garbage burpcheek balloon popgassy boyfrizzy purple curlssweet lavender perfume
Tommy Tootmoldy cheese cloudcrossed eye staregassy girlslimy orange mohawksweet lavender perfume
Sally Sniffburnt popcorn fogdouble chin wigglegassy girlslimy orange mohawkfresh peppermint spray
Clara Cloudburnt popcorn fogdouble chin wigglegassy girlslimy orange mohawksweet lavender perfume
Bella Blastmoldy cheese cloudcheek balloon popgassy girlfrizzy purple curlsripe strawberry mist
Buster Burpstinky broccoli puffcheek balloon popgassy girlneon green spikessweet lavender perfume
Lily Leakrotten egg blasteyebrow wiggle dancegassy girlfrizzy purple curlsfresh peppermint spray
Suzy Scentsour garbage burpcheek balloon popgassy boyfrizzy purple curlsfresh peppermint spray
Polly Popsour garbage burptongue stick outgassy boyslimy orange mohawksweet lavender perfume
Danny Draftstinky broccoli puffdouble chin wigglegassy girlslimy orange mohawksweet lavender perfume
Clue 1

Rounding

We checked the academy Stink-o-Meter. The digital screen only shows numbers rounded to the nearest ten, but we can still use it to narrow down our suspects.

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
3100
4700
70000
3000
4700
5000
200
T
3100
140
4700000
310
140
70000
500
200
140
T
3100
310
140
T
3100
4700
70000
70000
300
70000
20
50
140
470
310
5000
200
200000
70000
Round 3,111 to the nearest hundredT
Round 3,244 to the nearest thousandP
Round 4,668 to the nearest hundredH
Round 67,790 to the nearest ten thousandE
Round 18 to the nearest tenB
Round 153 to the nearest hundredN
Round 308 to the nearest tenD
Round 46 to the nearest tenR
Round 290 to the nearest hundredY
Round 235,354 to the nearest hundred thousandC
Round 470 to the nearest tenW
Round 4,739,333 to the nearest hundred thousandM
Round 538 to the nearest hundredS
Round 4,607 to the nearest thousandA
Round 143 to the nearest tenO
0/15 letters found
Clue 2

Addition

Our detective tallied up all the stolen gas-canisters from the supply closet. Adding up the total empty boxes gives us our next big lead.

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
9735
9295
7974
7744
7246
T
9735
6827
7974
3307
3307
9295
7974
6922
4116
6671
6922
9369
6922
3307
3307
5112
9369
7246
4116
3680
3680
6922
4689
9369
9295
7246
6827
9369
5007 + 4728 =T
3556 + 4188 =W
4213 + 2614 =N
4915 + 2331 =I
2137 + 1543 =L
4867 + 4502 =G
4472 + 4823 =H
1271 + 2845 =R
1927 + 1380 =S
1848 + 3264 =Y
2405 + 2284 =U
2403 + 4519 =A
5477 + 2497 =E
3029 + 3642 =D
0/14 letters found
Clue 3

Subtraction

We found a crate of nose-plugs left behind by the getaway team. Subtracting the dirty plugs from the clean ones tells us who we can cross off the list.

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
2395
5402
5723
7557
3708
2509
8107
2509
8291
2509
7557
5143
3708
4430
6440
5198
8291
5723
5723
T
2395
3125
2509
6782
5723
8107
7203
5723
3708
4655
5723
3708
5143
1266
6440
5723
3547 - 1152 =T
12533 - 4976 =Y
8751 - 4321 =O
5652 - 250 =H
3897 - 2631 =U
9675 - 1568 =N
8084 - 4376 =R
11593 - 4390 =D
10901 - 2610 =W
7428 - 4919 =A
5963 - 1308 =P
8073 - 2350 =E
8630 - 3487 =F
9761 - 4563 =S
8738 - 1956 =V
8861 - 2421 =M
5004 - 1879 =L
0/17 letters found
Clue 4

Multiplication facts (1-12)

The villain ran through the academy greenhouse, knocking over rows of stinky cabbage plants. Multiplying the rows by the plants in each row reveals a secret code.

Solve each problem to learn its letter. Then write that letter in every box that shows the same number, and read the secret clue.

S
72
25
108
48
36
16
63
54
40
9
60
48
16
30
54
42
8
9
16
16
120
42
54
S
72
16
40
96
30
60
42
54
25
25
6 × 12 =S
6 × 9 =A
9 × 12 =I
6 × 6 =Y
8 × 2 =O
5 × 5 =L
5 × 12 =E
3 × 3 =G
6 × 7 =W
10 × 12 =P
12 × 8 =T
7 × 9 =R
12 × 4 =M
8 × 5 =N
10 × 3 =H
8 × 1 =K
0/16 letters found
Clue 5

Division facts (1-12) — the last clue

To clear the air, we had to divide our super-strength air fresheners equally among the junior detectives so everyone could sniff out 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
108 ÷ 12 = ?
33 ÷ 3 = ?
80 ÷ 10 = ?
27 ÷ 9 = ?
2 ÷ 1 = ?
50 ÷ 10 = ?
24 ÷ 6 = ?
48 ÷ 4 = ?
7 ÷ 1 = ?
60 ÷ 10 = ?
40 ÷ 4 = ?
Step 2 — cross out the sentence with each answer
1.The villain puffs stinky broccoli gas, then wiggles their double chin.
2.The villain puffs stinky broccoli gas, then stares with crossed eyes.
3.The villain leaks moldy cheese clouds, then sticks their tongue out.
4.The villain blasts a rotten egg cloud, then stares with crossed eyes.
5.The villain burps sour garbage mist, then wiggles their double chin.
6.The villain puffs stinky broccoli gas, then pops their balloon cheeks.
7.The villain burps sour garbage mist, then does an eyebrow wiggle dance.
8.The villain burps sour garbage mist, then sticks their tongue out.
9.The villain leaks moldy cheese clouds, then stares with crossed eyes.
10.The villain burps sour garbage mist, then stares with crossed eyes.
11.The villain creates burnt popcorn fog, then wiggles their double chin.
12.The villain creates burnt popcorn fog, then stares with crossed eyes.
Solve it

Name the culprit

Choose the one suspect left standing.

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 Smelly-Sock Bandit — set in Gasville Scent Academy
Format
Interactive online & printable worksheet with answer key
Solution
One unique, verified culprit among 21 suspects