🏴☠️ PiratesGrade 1Reading: grades 1-2AdditionSubtractionSkip countingPlace valueMissing addends
The Mystery of the Missing Treasure Chest
Someone snuck into Captain Barnaby's cabin and took the map to Skull Island! Solve the math clues to help the crew catch the 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
| Name | Pirate Gear | Pocket Item | Dominant Hand | Hair Color | Secret Fear |
|---|---|---|---|---|---|
| Edward Teach | Spyglass | Rope Knot | Right Handed | Red Hair | Bright Lights |
| Sailor Sue | Spyglass | Rope Knot | Right Handed | Red Hair | Loud Whistles |
| Henry Morgan | Golden Anchor | Wooden Coin | Right Handed | Black Hair | Lemon Juice |
| Pegleg Pete | Golden Anchor | Iron Key | Left Handed | Red Hair | Lemon Juice |
| Anchor Annie | Spyglass | Parrot Feather | Right Handed | Grey Hair | Loud Whistles |
| Bouncing Bob | Silver Cutlass | Parrot Feather | Right Handed | Red Hair | Lemon Juice |
| Captain Blackbeard | Map Scroll | Rope Knot | Left Handed | Grey Hair | Bright Lights |
| Salty Sam | Golden Anchor | Rope Knot | Right Handed | Grey Hair | Loud Whistles |
| Barnaby Blue | Spyglass | Wooden Coin | Right Handed | Red Hair | Bright Lights |
| Anne Bonny | Brass Compass | Rope Knot | Right Handed | Red Hair | Bright Lights |
| Sharkbait Sam | Map Scroll | Parrot Feather | Right Handed | Grey Hair | Bright Lights |
| Barnacle Bill | Map Scroll | Wooden Coin | Right Handed | Black Hair | Loud Whistles |
| Calico Jack | Map Scroll | Rope Knot | Right Handed | Grey Hair | Lemon Juice |
| Skipper Skip | Brass Compass | Parrot Feather | Left Handed | Black Hair | Loud Whistles |
| Cannonball Cole | Brass Compass | Parrot Feather | Right Handed | Grey Hair | Bright Lights |
| Jolly Roger | Spyglass | Iron Key | Left Handed | Grey Hair | Bright Lights |
| Driftwood Dave | Golden Anchor | Sea Shell | Right Handed | Red Hair | Bright Lights |
| Patchy Pete | Silver Cutlass | Rope Knot | Left Handed | Red Hair | Bright Lights |
| Bartholomew Roberts | Golden Anchor | Rope Knot | Right Handed | Red Hair | Bright Lights |
| Deckhand Dan | Silver Cutlass | Sea Shell | Right Handed | Black Hair | Bright Lights |
| Grace O Malley | Golden Anchor | Parrot Feather | Left Handed | Black Hair | Bright Lights |
Clue 1
Addition
First Mate Mae adds gold coins from two small chests on the deck.
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
15
3
11
18
4
10
10
16
4
9
8
7
11
2
9
7
T
15
5
16
6
6
12
16
2
11
16
2
3
11
10
10
5 + 10 =T
8 + 10 =V
2 + 5 =O
1 + 2 =H
7 + 2 =N
5 + 3 =D
6 + 5 =E
4 + 12 =A
5 + 7 =Y
1 + 3 =I
5 + 1 =R
7 + 3 =L
1 + 1 =S
2 + 3 =C
0/14 letters found
Clue 2
Subtraction
Lookout Lou subtracts used cannonballs from the deck supply.
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
9
13
7
8
19
7
5
12
3
16
6
1
1
5
6
19
6
8
17
6
14
13
T
9
13
5
19
10
7
10
15 - 6 =T
14 - 9 =A
10 - 3 =E
13 - 1 =K
20 - 1 =N
20 - 4 =V
2 - 1 =L
17 - 4 =H
14 - 4 =D
19 - 2 =R
13 - 5 =S
10 - 7 =Y
18 - 4 =G
11 - 5 =I
0/14 letters found
Clue 3
Skip counting
Sailor Sue skip counts wooden barrels stacked along the ship rail.
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
21
45
20
80
110
120
120
22
110
130
28
30
130
40
12
28
15
25
14
28
110
70
45
T
21
120
110
70
45
T
21
40
Skip-count by 3s. Fill the blank: 3, 6, 9, 12, 15, 18, ___, 24, 27T
Skip-count by 10s. Fill the blank: 10, 20, 30, 40, 50, 60, 70, 80, 90, 100, 110, 120, ___, 140, 150N
Skip-count by 2s. Fill the blank: 2, 4, 6, 8, 10, 12, ___, 16, 18B
Skip-count by 5s. Fill the blank: 5, 10, 15, 20, 25, 30, 35, 40, ___, 50, 55H
Skip-count by 5s. Fill the blank: 5, 10, 15, 20, 25, 30, 35, ___, 45, 50S
Skip-count by 2s. Fill the blank: 2, 4, 6, 8, 10, 12, 14, 16, 18, ___, 22, 24E
Skip-count by 3s. Fill the blank: 3, 6, 9, 12, 15, 18, 21, 24, 27, ___, 33, 36U
Skip-count by 10s. Fill the blank: 10, 20, 30, 40, 50, 60, 70, 80, 90, 100, ___, 120, 130I
Skip-count by 2s. Fill the blank: 2, 4, 6, 8, 10, 12, 14, 16, 18, 20, 22, 24, 26, ___, 30, 32R
Skip-count by 10s. Fill the blank: 10, 20, 30, 40, 50, 60, ___, 80, 90G
Skip-count by 5s. Fill the blank: 5, 10, 15, 20, ___, 30, 35M
Skip-count by 10s. Fill the blank: 10, 20, 30, 40, 50, 60, 70, ___, 90, 100V
Skip-count by 10s. Fill the blank: 10, 20, 30, 40, 50, 60, 70, 80, 90, 100, 110, ___, 130, 140L
Skip-count by 2s. Fill the blank: 2, 4, 6, 8, 10, ___, 14, 16F
Skip-count by 2s. Fill the blank: 2, 4, 6, 8, 10, 12, 14, 16, 18, 20, ___, 24, 26A
Skip-count by 5s. Fill the blank: 5, 10, ___, 20, 25O
0/16 letters found
Clue 4
Place value
Quartermaster Pip checks tens and ones on the pearl chart.
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
61
11
63
77
28
25
40
88
11
40
43
37
94
88
37
68
68
43
11
79
46
11
25
11
What number has 6 tens and 1 one?W
What number has 8 tens and 8 ones?R
What number has 2 tens and 8 ones?U
What number has 4 tens and 0 ones?D
What number has 2 tens and 5 ones?N
What number has 1 ten and 1 one?E
What number has 6 tens and 8 ones?T
What number has 7 tens and 7 ones?O
What number has 6 tens and 3 ones?F
What number has 4 tens and 3 ones?H
What number has 4 tens and 6 ones?C
What number has 7 tens and 9 ones?S
What number has 3 tens and 7 ones?A
What number has 9 tens and 4 ones?I
0/14 letters found
Clue 5
Missing addends — the last clue
Captain Barnaby finds the missing number of sea maps needed for the trip.
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
3 + ___ = 11
9 + ___ = 10
4 + ___ = 8
2 + ___ = 12
10 + ___ = 17
4 + ___ = 16
8 + ___ = 10
5 + ___ = 11
2 + ___ = 13
9 + ___ = 18
6 + ___ = 9
Step 2 — cross out the sentence with each answer
1.The villain looked through a spyglass, then tied a rope knot.
2.The villain checked a map scroll, then dropped a wooden coin.
3.The villain checked a map scroll, then left a parrot feather.
4.The villain looked through a spyglass, then dropped a wooden coin.
5.The villain dropped a golden anchor, then tied a rope knot.
6.The villain checked a map scroll, then dropped an iron key.
7.The villain used a brass compass, then left a parrot feather.
8.The villain used a brass compass, then tied a rope knot.
9.The villain swung a silver cutlass, then tied a rope knot.
10.The villain dropped a golden anchor, then lost a sea shell.
11.The villain used a brass compass, then lost a sea shell.
12.The villain swung a silver cutlass, then dropped a wooden coin.
Solve it
Name the culprit
Choose the one suspect left standing.
Answer Key — The Mystery of the Missing Treasure Chest
Culprit: Bartholomew Roberts (Golden Anchor · Rope Knot · Right Handed · Red Hair · Bright Lights)
- Clue 1 (Addition): "THE VILLAIN DOES NOT CARRY A SEA SHELL"5 + 10 = 15 (T) · 8 + 10 = 18 (V) · 2 + 5 = 7 (O) · 1 + 2 = 3 (H) · 7 + 2 = 9 (N) · 5 + 3 = 8 (D) · 6 + 5 = 11 (E) · 4 + 12 = 16 (A) · 5 + 7 = 12 (Y) · 1 + 3 = 4 (I) · 5 + 1 = 6 (R) · 7 + 3 = 10 (L) · 1 + 1 = 2 (S) · 2 + 3 = 5 (C)
- Clue 2 (Subtraction): "THE SNEAKY VILLAIN IS RIGHT HANDED"15 - 6 = 9 (T) · 14 - 9 = 5 (A) · 10 - 3 = 7 (E) · 13 - 1 = 12 (K) · 20 - 1 = 19 (N) · 20 - 4 = 16 (V) · 2 - 1 = 1 (L) · 17 - 4 = 13 (H) · 14 - 4 = 10 (D) · 19 - 2 = 17 (R) · 13 - 5 = 8 (S) · 10 - 7 = 3 (Y) · 18 - 4 = 14 (G) · 11 - 5 = 6 (I)
- Clue 3 (Skip counting): "THE VILLAIN RUNS FROM BRIGHT LIGHTS"Skip-count by 3s. Fill the blank: 3, 6, 9, 12, 15, 18, ___, 24, 27 = 21 (T) · Skip-count by 10s. Fill the blank: 10, 20, 30, 40, 50, 60, 70, 80, 90, 100, 110, 120, ___, 140, 150 = 130 (N) · Skip-count by 2s. Fill the blank: 2, 4, 6, 8, 10, 12, ___, 16, 18 = 14 (B) · Skip-count by 5s. Fill the blank: 5, 10, 15, 20, 25, 30, 35, 40, ___, 50, 55 = 45 (H) · Skip-count by 5s. Fill the blank: 5, 10, 15, 20, 25, 30, 35, ___, 45, 50 = 40 (S) · Skip-count by 2s. Fill the blank: 2, 4, 6, 8, 10, 12, 14, 16, 18, ___, 22, 24 = 20 (E) · Skip-count by 3s. Fill the blank: 3, 6, 9, 12, 15, 18, 21, 24, 27, ___, 33, 36 = 30 (U) · Skip-count by 10s. Fill the blank: 10, 20, 30, 40, 50, 60, 70, 80, 90, 100, ___, 120, 130 = 110 (I) · Skip-count by 2s. Fill the blank: 2, 4, 6, 8, 10, 12, 14, 16, 18, 20, 22, 24, 26, ___, 30, 32 = 28 (R) · Skip-count by 10s. Fill the blank: 10, 20, 30, 40, 50, 60, ___, 80, 90 = 70 (G) · Skip-count by 5s. Fill the blank: 5, 10, 15, 20, ___, 30, 35 = 25 (M) · Skip-count by 10s. Fill the blank: 10, 20, 30, 40, 50, 60, 70, ___, 90, 100 = 80 (V) · Skip-count by 10s. Fill the blank: 10, 20, 30, 40, 50, 60, 70, 80, 90, 100, 110, ___, 130, 140 = 120 (L) · Skip-count by 2s. Fill the blank: 2, 4, 6, 8, 10, ___, 14, 16 = 12 (F) · Skip-count by 2s. Fill the blank: 2, 4, 6, 8, 10, 12, 14, 16, 18, 20, ___, 24, 26 = 22 (A) · Skip-count by 5s. Fill the blank: 5, 10, ___, 20, 25 = 15 (O)
- Clue 4 (Place value): "WE FOUND RED HAIR AT THE SCENE"What number has 6 tens and 1 one? = 61 (W) · What number has 8 tens and 8 ones? = 88 (R) · What number has 2 tens and 8 ones? = 28 (U) · What number has 4 tens and 0 ones? = 40 (D) · What number has 2 tens and 5 ones? = 25 (N) · What number has 1 ten and 1 one? = 11 (E) · What number has 6 tens and 8 ones? = 68 (T) · What number has 7 tens and 7 ones? = 77 (O) · What number has 6 tens and 3 ones? = 63 (F) · What number has 4 tens and 3 ones? = 43 (H) · What number has 4 tens and 6 ones? = 46 (C) · What number has 7 tens and 9 ones? = 79 (S) · What number has 3 tens and 7 ones? = 37 (A) · What number has 9 tens and 4 ones? = 94 (I)
- Clue 5 (Missing addends): surviving statement (box 5) → Bartholomew Roberts3 + ___ = 11 = 8 · 9 + ___ = 10 = 1 · 4 + ___ = 8 = 4 · 2 + ___ = 12 = 10 · 10 + ___ = 17 = 7 · 4 + ___ = 16 = 12 · 8 + ___ = 10 = 2 · 5 + ___ = 11 = 6 · 2 + ___ = 13 = 11 · 9 + ___ = 18 = 9 · 6 + ___ = 9 = 3
About this mystery
- Grade level
- Grade 1 math
- Math topics
- Addition, Subtraction, Skip counting, Place value, Missing addends
- Reading level
- grades 1-2
- Theme
- The Mystery of the Missing Treasure Chest — set in Salty Cove
- Format
- Interactive online & printable worksheet with answer key
- Solution
- One unique, verified culprit among 21 suspects