Math Crackers
🏴‍☠️ PiratesGrade 4Reading: grades 7-9AdditionMultiplicationSubtractionSkip countingDivision

The Mystery of the Crimson Galleon

A rogue pirate breached the Captain cabin under cover of a midnight storm and stole the ancient treasure chart of Blackbeard. Analyze the clues to uncover the culprit before they escape across the Spanish Main.

Suspects

Possible suspects

Cross off a row as each clue rules it out. On screen, tap a row.

21 of 21 still in play
NamePrimary WeaponSecondary GearDominant HandBandana ColorPhobia
Samuel BellamyBoarding AxePocket MapLeft-HandedCrimson BandanaBright Sunlight
Charlotte de BerryBlunderbussSpyglassRight-HandedMidnight BandanaBright Sunlight
Howell DavisBlunderbussGrappling HookRight-HandedMidnight BandanaBright Sunlight
Zheng Yi SaoFlintlock PistolGrappling HookLeft-HandedMidnight BandanaBright Sunlight
Henry MorganBoarding AxeGrappling HookRight-HandedCrimson BandanaBright Sunlight
Grace O MalleyFlintlock PistolGrappling HookLeft-HandedCrimson BandanaLoud Thunder
Francois l OllonaisBlunderbussBrass LanternLeft-HandedCrimson BandanaLoud Thunder
Jack RackhamBoarding AxeSpyglassRight-HandedSea Green BandanaLoud Thunder
Charles VaneBlunderbussBrass LanternRight-HandedCrimson BandanaLoud Thunder
Redbeard VanceIron MarlinspikeSpyglassRight-HandedCrimson BandanaBright Sunlight
Sayyida al HurraFlintlock PistolPocket MapLeft-HandedSea Green BandanaLoud Thunder
Anne BonnyFlintlock PistolBrass LanternLeft-HandedCrimson BandanaSqueaking Rats
Woodes RogersFlintlock PistolPocket MapRight-HandedMidnight BandanaBright Sunlight
Mary ReadBlunderbussSpyglassRight-HandedSea Green BandanaLoud Thunder
Khair ad DinBoarding AxeBrass CompassLeft-HandedCrimson BandanaSqueaking Rats
Thomas TewBlunderbussGrappling HookLeft-HandedMidnight BandanaBright Sunlight
William KiddCutlassBrass CompassRight-HandedMidnight BandanaBright Sunlight
Stede BonnetBlunderbussSpyglassRight-HandedMidnight BandanaLoud Thunder
Bartholomew RobertsFlintlock PistolBrass LanternRight-HandedMidnight BandanaLoud Thunder
Edward LowBoarding AxeSpyglassRight-HandedMidnight BandanaBright Sunlight
Jean LafitteIron MarlinspikeGrappling HookLeft-HandedMidnight BandanaLoud Thunder
Clue 1

Addition

Quartermaster Gibbs tallied the recovered silver doubloons from the cargo hold to see how much booty remained after the midnight raid.

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
6928
3227
8536
7223
9723
7965
7965
9821
9723
5393
4036
9723
4036
5393
6123
T
6928
4036
3882
6123
2482
9821
9120
3882
9821
7305
7305
5424
6123
3727
2482
9821
7305
7305
3933 + 2995 =T
3256 + 4049 =S
3632 + 6091 =I
4696 + 3269 =L
3691 + 1702 =N
2501 + 1226 =M
1308 + 2728 =D
1605 + 877 =P
3430 + 5106 =E
4230 + 1893 =O
6722 + 3099 =A
2995 + 6125 =B
3524 + 1900 =C
1750 + 2132 =R
1087 + 2140 =H
2553 + 4670 =V
0/16 letters found
Clue 2

Multiplication facts (1-12)

Navigator Hayes organized the crate storage into identical grid rows across the lower gundeck to secure the powder kegs before the storm.

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
36
20
9
144
3
T
36
70
77
9
9
63
60
63
9
100
100
70
T
36
20
49
63
70
11
20
T
36
20
49
77
60
9
60
11
63
70
50
6 × 6 =T
10 × 10 =W
10 × 7 =I
10 × 6 =D
9 × 7 =R
5 × 10 =P
4 × 5 =H
11 × 7 =N
12 × 12 =M
1 × 11 =G
7 × 7 =A
3 × 1 =U
9 × 1 =E
0/13 letters found
Clue 3

Subtraction

First Mate Vance calculated how many iron cannonballs were missing from the armory stack after the intruder escaped into the fog.

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
1990
4252
2999
1258
3315
7800
1615
1615
6897
1557
7800
2168
3315
6478
1557
2999
1054
2999
2776
6524
1054
6478
3288
2416
1054
4873
2168
4252
T
1990
1258
6052
4607
1615
4873
2168
4252
T
1990
6147 - 4157 =T
4434 - 182 =H
8902 - 2850 =U
7411 - 4096 =C
5962 - 3186 =D
4987 - 2571 =B
6742 - 1869 =I
7930 - 1406 =F
11768 - 3968 =A
5158 - 3900 =S
2944 - 1387 =W
5436 - 3268 =G
4701 - 3647 =R
5179 - 572 =N
7064 - 586 =O
4448 - 1160 =M
3373 - 1758 =L
8613 - 1716 =Y
4503 - 1504 =E
0/19 letters found
Clue 4

Skip counting

Lookout Pete counted the wooden rungs on the main mast shroud by leaps to determine how high the suspect climbed.

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

M
9
140
39
25
140
27
65
70
8
36
25
39
36
25
36
70
65
45
100
36
39
6
6
25
36
27
27
100
39
33
25
39
33
33
45
Skip-count by 3s. Fill the blank: 3, 6, ___, 12, 15M
Skip-count by 2s. Fill the blank: 2, 4, ___, 8, 10S
Skip-count by 3s. Fill the blank: 3, 6, 9, 12, 15, 18, 21, 24, ___, 30, 33G
Skip-count by 10s. Fill the blank: 10, 20, 30, 40, 50, 60, 70, 80, 90, ___, 110, 120E
Skip-count by 5s. Fill the blank: 5, 10, 15, 20, ___, 30, 35N
Skip-count by 5s. Fill the blank: 5, 10, 15, 20, 25, 30, 35, 40, 45, 50, 55, 60, ___, 70, 75H
Skip-count by 5s. Fill the blank: 5, 10, 15, 20, 25, 30, 35, 40, 45, 50, 55, 60, 65, ___, 75, 80T
Skip-count by 3s. Fill the blank: 3, 6, 9, 12, 15, 18, 21, 24, 27, 30, 33, ___, 39, 42A
Skip-count by 10s. Fill the blank: 10, 20, 30, 40, 50, 60, 70, 80, 90, 100, 110, 120, 130, ___, 150, 160I
Skip-count by 5s. Fill the blank: 5, 10, 15, 20, 25, 30, 35, 40, ___, 50, 55R
Skip-count by 3s. Fill the blank: 3, 6, 9, 12, 15, 18, 21, 24, 27, 30, 33, 36, ___, 42, 45D
Skip-count by 3s. Fill the blank: 3, 6, 9, 12, 15, 18, 21, 24, 27, 30, ___, 36, 39O
Skip-count by 2s. Fill the blank: 2, 4, 6, ___, 10, 12B
0/13 letters found
Clue 5

Division facts (1-12) — the last clue

Boatswain Drake divided the ration sea biscuits equally among the surviving watchmen to check who received an extra share.

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
33 ÷ 11 = ?
96 ÷ 12 = ?
49 ÷ 7 = ?
5 ÷ 5 = ?
24 ÷ 6 = ?
60 ÷ 12 = ?
90 ÷ 10 = ?
6 ÷ 3 = ?
60 ÷ 6 = ?
24 ÷ 2 = ?
77 ÷ 7 = ?
Step 2 — cross out the sentence with each answer
1.The villain fired a flintlock pistol, then shined a brass lantern.
2.The villain brandished an iron marlinspike, then dropped a spyglass.
3.The villain swung a boarding axe, then dropped a spyglass.
4.The villain brandished an iron marlinspike, then shined a brass lantern.
5.The villain fired a flintlock pistol, then hooked a grappling line.
6.The villain fired a flintlock pistol, then tore a pocket map.
7.The villain blasted a blunderbuss, then hooked a grappling line.
8.The villain blasted a blunderbuss, then dropped a spyglass.
9.The villain blasted a blunderbuss, then lost a brass compass.
10.The villain swung a boarding axe, then hooked a grappling line.
11.The villain swung a boarding axe, then shined a brass lantern.
12.The villain blasted a blunderbuss, then shined a brass lantern.
Solve it

Name the culprit

Choose the one suspect left standing.

About this mystery

Grade level
Grade 4 math
Math topics
Addition, Multiplication, Subtraction, Skip counting, Division
Reading level
grades 7-9
Theme
The Mystery of the Crimson Galleon — set in Dead Man Creek Anchor
Format
Interactive online & printable worksheet with answer key
Solution
One unique, verified culprit among 21 suspects

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