⚾ BaseballGrade 7Reading: grades 7-9IntegersWord problemsMulti-step word problemsPercentagesTwo-step equations
The Diamond Dome Heist
The prestigious Diamond Dome has been breached! Just hours before the ultimate game of the season, the legendary Golden Bat went missing from the Hall of Fame lobby. Security footage is static, but a series of athletic clues were left behind across the diamond. As the chief sports detective, it is up to you to decode the evidence, track the field data, and identify the thief before the first pitch is thrown.
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 Pitch | Specialist Gear | Batting Stance | Helmet Color | Environmental Weakness |
|---|---|---|---|---|---|
| Mookie Betts | Slider | Pine Tar Bat | Right Handed Stance | Matte Black Helmet | Screaming Fans |
| Freddie Freeman | Fastball | Pine Tar Bat | Left Handed Stance | Red Helmet | Soggy Turf |
| Ken Griffey | Knuckleball | Stealth Cleats | Right Handed Stance | Matte Black Helmet | Screaming Fans |
| Jose Altuve | Spitball | Radar Gun | Left Handed Stance | Matte Black Helmet | Soggy Turf |
| Aaron Judge | Slider | Scuffed Ball | Right Handed Stance | Red Helmet | Soggy Turf |
| Francisco Lindor | Curveball | Stealth Cleats | Left Handed Stance | Red Helmet | Sunlight Glare |
| Shohei Ohtani | Slider | Weighted Gloves | Right Handed Stance | Red Helmet | Soggy Turf |
| Gerrit Cole | Fastball | Pine Tar Bat | Left Handed Stance | Matte Black Helmet | Soggy Turf |
| Derek Jeter | Knuckleball | Radar Gun | Right Handed Stance | Matte Black Helmet | Soggy Turf |
| Cal Ripken | Curveball | Stealth Cleats | Right Handed Stance | Matte Black Helmet | Soggy Turf |
| Justin Verlander | Knuckleball | Pine Tar Bat | Left Handed Stance | Matte Black Helmet | Soggy Turf |
| Jackie Robinson | Knuckleball | Pine Tar Bat | Left Handed Stance | Matte Black Helmet | Sunlight Glare |
| Max Scherzer | Slider | Stealth Cleats | Left Handed Stance | Red Helmet | Soggy Turf |
| Bryce Harper | Fastball | Weighted Gloves | Left Handed Stance | Blue Helmet | Sunlight Glare |
| Ronald Acuna | Curveball | Pine Tar Bat | Left Handed Stance | Red Helmet | Screaming Fans |
| Nolan Ryan | Fastball | Radar Gun | Left Handed Stance | Blue Helmet | Screaming Fans |
| Corey Seager | Spitball | Pine Tar Bat | Left Handed Stance | Matte Black Helmet | Soggy Turf |
| Fernando Tatis | Curveball | Stealth Cleats | Right Handed Stance | Matte Black Helmet | Screaming Fans |
| Randy Johnson | Slider | Scuffed Ball | Left Handed Stance | Matte Black Helmet | Soggy Turf |
| Albert Pujols | Fastball | Radar Gun | Left Handed Stance | Red Helmet | Screaming Fans |
| Ichiro Suzuki | Spitball | Pine Tar Bat | Right Handed Stance | Blue Helmet | Screaming Fans |
Clue 1
Integers
The stadium's ticket booth calculates daily sales across multiple gate entrances, subtraction of promotional discounts, and addition of souvenir bundles to trace the thief's entry path.
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
27
22
23
10
19
6
6
16
19
3
11
13
23
9
3
13
T
27
21
9
23
16
9
29
21
26
26
23
11
25
16
6
6
23 - (-4) =T
16 - (-6) =H
(-9) + 18 =S
13 - (-10) =E
(-10) + 35 =B
7 - (-6) =O
8 - (-3) =D
(-14) + 30 =A
(-2) + 21 =I
(-3) + 13 =V
4 - (-2) =L
(-1) + 4 =N
(-12) + 33 =U
15 - (-11) =F
17 - (-12) =C
0/15 letters found
Clue 2
Word problems
We analyze the concession stand logs, calculating how many boxes of hotdogs and bags of peanuts were purchased during the seventh-inning stretch to find the suspicious bystander.
Solve each problem to learn its letter, then write the letters in the boxes to fill in the missing word.
Awitnesssawthevillainwas .
L
94
80
39
9
89
33
85
D
80
D
S
9
33
85
C
80
There were 127 scorecards. 33 were used up. How many scorecards are left?L
There were 112 cleats. 32 were used up. How many cleats are left?E
There were 103 batting gloves. 14 were used up. How many batting gloves are left?H
There were 69 cleats. 30 were used up. How many cleats are left?F
There were 69 scorecards. 36 were used up. How many scorecards are left?A
There were 124 baseballs. 39 were used up. How many baseballs are left?N
The head coach lined up 3 rows of 3 cleats. How many cleats in all?T
0/7 letters found
Clue 3
Multi-step word problems
Looking at the pitch-velocity radar logs, we subtract the below-average pitches from the above-average strikes to find the temperature drops near the stolen trophy case.
Solve each problem to learn its letter, then write the letters in the boxes to fill in the missing word.
Someonescaredthevillainoffwith .
S
60
58
28
28
56
72
41
70
F
The head coach filled 3 boxes with 4 foam fingers each, then found 48 more foam fingers. How many foam fingers are there in all?S
The head coach collected 91 batting gloves in the morning and 114 batting gloves in the afternoon, then split them equally among 5 the Mudville Sluggers. How many batting gloves did each get?U
There were 388 foam fingers in all. 2 the Mudville Sluggers used 26 foam fingers each. The other 6 the Mudville Sluggers shared the rest equally. How many foam fingers did each of the other the Mudville Sluggers get?Y
The head coach earned 7 baseballs in each of 6 rounds, plus 26 bonus baseballs. Then 10 baseballs were lost. How many baseballs are left?O
There were 230 batting gloves in all. 34 batting gloves were set aside. The rest were shared equally among 7 the Mudville Sluggers. How many batting gloves did each get?G
There were 237 foam fingers in all. 3 the Mudville Sluggers used 31 foam fingers each. The other 2 the Mudville Sluggers shared the rest equally. How many foam fingers did each of the other the Mudville Sluggers get?T
There were 360 baseballs in all. 10 baseballs were set aside. The rest were shared equally among 5 the Mudville Sluggers. How many baseballs did each get?R
0/7 letters found
Clue 4
Percentages
Reviewing the batting average sheets, we determine the exact percentage of successful bunts executed during the rainy night games to narrow down the target.
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
14
42
1
A
14
52
28
22
55
1
12
55
60
53
A
14
32
A
14
42
A
14
38
25
27
38
55
25
A
14
60
60
22
55
46
1
A
14
60
55
50% of 28 =A
75% of 56 =B
20% of 300 =T
20% of 275 =E
25% of 212 =W
40% of 30 =M
5% of 440 =H
5% of 920 =P
25% of 100 =D
10% of 280 =K
60% of 45 =O
25% of 208 =C
5% of 20 =L
50% of 76 =N
40% of 80 =S
0/15 letters found
Clue 5
Two-step equations — the last clue
To crack the locked stadium vault where the thief hid, we solve for the variable representing the total team runs minus twice the home run count.
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
3x + 4 = 13, x = ?
2x + 7 = 29, x = ?
5x + 5 = 25, x = ?
6x + 10 = 46, x = ?
3x + 6 = 30, x = ?
4x + 2 = 6, x = ?
3x + 11 = 41, x = ?
3x + 11 = 47, x = ?
3x + 9 = 30, x = ?
5x + 2 = 12, x = ?
4x + 6 = 26, x = ?
Step 2 — cross out the sentence with each answer
1.The villain slid a tricky slider, then crept past the security cameras in stealth cleats.
2.The villain tossed a fluttering knuckleball, then crept past the security cameras in stealth cleats.
3.The villain fired a blistering fastball, then cracked open the trophy case with a pine tar bat.
4.The villain threw a greasy spitball, then measured the escape route with a radar gun.
5.The villain fired a blistering fastball, then smashed the locks with weighted gloves.
6.The villain tossed a fluttering knuckleball, then smashed the locks with weighted gloves.
7.The villain slid a tricky slider, then cracked open the trophy case with a pine tar bat.
8.The villain snapped a sharp curveball, then smashed the locks with weighted gloves.
9.The villain threw a greasy spitball, then cracked open the trophy case with a pine tar bat.
10.The villain snapped a sharp curveball, then distracted the guards with a scuffed ball.
11.The villain tossed a fluttering knuckleball, then cracked open the trophy case with a pine tar bat.
12.The villain threw a greasy spitball, then smashed the locks with weighted gloves.
Solve it
Name the culprit
Choose the one suspect left standing.
Answer Key — The Diamond Dome Heist
Culprit: Corey Seager (Spitball · Pine Tar Bat · Left Handed Stance · Matte Black Helmet · Soggy Turf)
- Clue 1 (Integers): "THE VILLAIN DOES NOT USE A SCUFFED BALL"23 - (-4) = 27 (T) · 16 - (-6) = 22 (H) · (-9) + 18 = 9 (S) · 13 - (-10) = 23 (E) · (-10) + 35 = 25 (B) · 7 - (-6) = 13 (O) · 8 - (-3) = 11 (D) · (-14) + 30 = 16 (A) · (-2) + 21 = 19 (I) · (-3) + 13 = 10 (V) · 4 - (-2) = 6 (L) · (-1) + 4 = 3 (N) · (-12) + 33 = 21 (U) · 15 - (-11) = 26 (F) · 17 - (-12) = 29 (C)
- Clue 2 (Word problems): "LEFT HANDED STANCE"There were 127 scorecards. 33 were used up. How many scorecards are left? = 94 (L) · There were 112 cleats. 32 were used up. How many cleats are left? = 80 (E) · There were 103 batting gloves. 14 were used up. How many batting gloves are left? = 89 (H) · There were 69 cleats. 30 were used up. How many cleats are left? = 39 (F) · There were 69 scorecards. 36 were used up. How many scorecards are left? = 33 (A) · There were 124 baseballs. 39 were used up. How many baseballs are left? = 85 (N) · The head coach lined up 3 rows of 3 cleats. How many cleats in all? = 9 (T)
- Clue 3 (Multi-step word problems): "SOGGY TURF"The head coach filled 3 boxes with 4 foam fingers each, then found 48 more foam fingers. How many foam fingers are there in all? = 60 (S) · The head coach collected 91 batting gloves in the morning and 114 batting gloves in the afternoon, then split them equally among 5 the Mudville Sluggers. How many batting gloves did each get? = 41 (U) · There were 388 foam fingers in all. 2 the Mudville Sluggers used 26 foam fingers each. The other 6 the Mudville Sluggers shared the rest equally. How many foam fingers did each of the other the Mudville Sluggers get? = 56 (Y) · The head coach earned 7 baseballs in each of 6 rounds, plus 26 bonus baseballs. Then 10 baseballs were lost. How many baseballs are left? = 58 (O) · There were 230 batting gloves in all. 34 batting gloves were set aside. The rest were shared equally among 7 the Mudville Sluggers. How many batting gloves did each get? = 28 (G) · There were 237 foam fingers in all. 3 the Mudville Sluggers used 31 foam fingers each. The other 2 the Mudville Sluggers shared the rest equally. How many foam fingers did each of the other the Mudville Sluggers get? = 72 (T) · There were 360 baseballs in all. 10 baseballs were set aside. The rest were shared equally among 5 the Mudville Sluggers. How many baseballs did each get? = 70 (R)
- Clue 4 (Percentages): "A BLACK HELMET WAS ABANDONED AT THE PLATE"50% of 28 = 14 (A) · 75% of 56 = 42 (B) · 20% of 300 = 60 (T) · 20% of 275 = 55 (E) · 25% of 212 = 53 (W) · 40% of 30 = 12 (M) · 5% of 440 = 22 (H) · 5% of 920 = 46 (P) · 25% of 100 = 25 (D) · 10% of 280 = 28 (K) · 60% of 45 = 27 (O) · 25% of 208 = 52 (C) · 5% of 20 = 1 (L) · 50% of 76 = 38 (N) · 40% of 80 = 32 (S)
- Clue 5 (Two-step equations): surviving statement (box 9) → Corey Seager3x + 4 = 13, x = 3 · 2x + 7 = 29, x = 11 · 5x + 5 = 25, x = 4 · 6x + 10 = 46, x = 6 · 3x + 6 = 30, x = 8 · 4x + 2 = 6, x = 1 · 3x + 11 = 41, x = 10 · 3x + 11 = 47, x = 12 · 3x + 9 = 30, x = 7 · 5x + 2 = 12, x = 2 · 4x + 6 = 26, x = 5
About this mystery
- Grade level
- Grade 7 math
- Math topics
- Integers, Word problems, Multi-step word problems, Percentages, Two-step equations
- Reading level
- grades 7-9
- Theme
- The Diamond Dome Heist — set in The Diamond Dome Stadium
- Format
- Interactive online & printable worksheet with answer key
- Solution
- One unique, verified culprit among 21 suspects