Grade 4Reading: grades 3-4MultiplicationMulti-step word problemsRoundingAdditionMissing addends
The Lost Compass Mystery
Someone swiped Ranger Rita's Golden Compass right off her camp desk! Check the clues to catch the sneaky rival explorer before they sail away with the island treasure.
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 | Main Tool | Gear Bag | Stance | Hat Color | Fear |
|---|---|---|---|---|---|
| Leo | Grappling Hook | Canvas Tents | Right Handed | Red Bandana | Prickly Bushes |
| Nellie | Brass Telescope | Rescue Flares | Left Handed | Brown Fedora | Muddy Swamps |
| Indiana | Signal Lantern | Rescue Flares | Left Handed | Brown Fedora | Prickly Bushes |
| Dora | Rope Ladder | Canteen Pack | Right Handed | Brown Fedora | Muddy Swamps |
| Annie | Rope Ladder | Canvas Tents | Right Handed | Green Cap | Screeching Bats |
| Cleo | Rope Ladder | Canteen Pack | Left Handed | Brown Fedora | Screeching Bats |
| Maya | Brass Telescope | Canteen Pack | Left Handed | Green Cap | Muddy Swamps |
| Marco | Brass Telescope | Canteen Pack | Left Handed | Brown Fedora | Muddy Swamps |
| Penny | Signal Lantern | Canteen Pack | Right Handed | Green Cap | Muddy Swamps |
| Jack | Machete Tool | Supply Sack | Left Handed | Brown Fedora | Muddy Swamps |
| Vasco | Rope Ladder | Canvas Tents | Left Handed | Brown Fedora | Muddy Swamps |
| Tenzing | Signal Lantern | Supply Sack | Right Handed | Brown Fedora | Muddy Swamps |
| Lara | Machete Tool | Canteen Pack | Left Handed | Brown Fedora | Muddy Swamps |
| Edmund | Machete Tool | Canteen Pack | Right Handed | Green Cap | Screeching Bats |
| Amelia | Machete Tool | Canteen Pack | Left Handed | Brown Fedora | Prickly Bushes |
| Brody | Rope Ladder | Supply Sack | Left Handed | Green Cap | Screeching Bats |
| Meriwether | Machete Tool | Rescue Flares | Right Handed | Red Bandana | Muddy Swamps |
| Diego | Rope Ladder | Canvas Tents | Right Handed | Red Bandana | Muddy Swamps |
| Finn | Machete Tool | Supply Sack | Right Handed | Brown Fedora | Muddy Swamps |
| Sam | Grappling Hook | Rescue Flares | Left Handed | Red Bandana | Muddy Swamps |
| Roald | Rope Ladder | Rescue Flares | Left Handed | Brown Fedora | Screeching Bats |
Clue 1
Multiplication facts (1-12)
Ranger Rita counted equal rows of supply crates stacked at base camp.
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
72
15
81
21
77
66
66
33
77
70
25
55
81
120
70
55
T
72
9
33
84
84
36
9
33
70
21
33
120
T
72
81
70
T
72
120
12 × 6 =T
7 × 10 =N
9 × 1 =C
6 × 11 =L
5 × 11 =O
7 × 11 =I
11 × 3 =A
9 × 9 =E
5 × 5 =D
5 × 3 =H
7 × 3 =V
7 × 12 =R
12 × 10 =S
6 × 6 =Y
0/14 letters found
Clue 2
Multi-step word problems
The trail scout tracked camp spending after buying supplies and getting change.
Solve each problem to learn its letter, then write the letters in the boxes to fill in the missing word.
Awitnesssawthevillainwas .
L
13
30
69
58
35
28
49
D
30
D
Scout collected 15 compasses in the morning and 37 compasses in the afternoon, then split them equally among 4 Explorers. How many compasses did each get?L
There were 250 flashlight batteries in all. 18 flashlight batteries were set aside. The rest were shared equally among 4 Explorers. How many flashlight batteries did each get?T
There were 291 flashlight batteries in all. 4 Explorers used 36 flashlight batteries each. The other 3 Explorers shared the rest equally. How many flashlight batteries did each of the other Explorers get?N
There were 342 flashlight batteries in all. 3 Explorers used 22 flashlight batteries each. The other 4 Explorers shared the rest equally. How many flashlight batteries did each of the other Explorers get?F
There were 152 canteen cups in all. 4 Explorers used 10 canteen cups each. The other 4 Explorers shared the rest equally. How many canteen cups did each of the other Explorers get?A
Scout collected 14 canteen cups in the morning and 136 canteen cups in the afternoon, then split them equally among 5 Explorers. How many canteen cups did each get?E
There were 363 compasses in all. 13 compasses were set aside. The rest were shared equally among 10 Explorers. How many compasses did each get?H
0/7 letters found
Clue 3
Rounding
The scout radio screen only showed rounded altitude numbers.
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
70
30
200
20
500
200
1300
3000
20
T
70
900
9000
3700
110
200
170
2900
500
9000
900
170
170
130
20
430
1300
9000
1100
20
Round 71 to the nearest tenT
Round 1,144 to the nearest hundredP
Round 29 to the nearest tenH
Round 8,539 to the nearest thousandM
Round 3,669 to the nearest hundredB
Round 191 to the nearest hundredE
Round 108 to the nearest tenL
Round 167 to the nearest tenD
Round 1,301 to the nearest hundredA
Round 17 to the nearest tenS
Round 133 to the nearest tenY
Round 2,914 to the nearest hundredI
Round 915 to the nearest hundredU
Round 2,836 to the nearest thousandK
Round 429 to the nearest tenW
Round 452 to the nearest hundredN
0/16 letters found
Clue 4
Addition
The team tallied all the gold coins gathered along the shore.
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
6504
4243
6063
6948
A
6504
8379
5232
2298
7204
7204
5232
6948
8303
5299
A
6504
8730
6948
8303
8259
9197
5232
2298
6686
8303
6948
A
6504
2018 + 4486 =A
5878 + 2852 =B
3763 + 4616 =P
2649 + 2650 =M
2657 + 5602 =W
2591 + 4357 =R
894 + 1404 =E
3433 + 3253 =D
3050 + 3013 =T
1416 + 2827 =S
4241 + 4956 =N
3456 + 3748 =L
5311 + 2992 =O
2340 + 2892 =F
0/14 letters found
Clue 5
Missing addends — the last clue
Some map pieces were missing from the complete trail map.
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
22 + ___ = 30
16 + ___ = 27
10 + ___ = 19
25 + ___ = 31
11 + ___ = 14
20 + ___ = 30
5 + ___ = 7
3 + ___ = 7
32 + ___ = 44
27 + ___ = 28
17 + ___ = 22
Step 2 — cross out the sentence with each answer
1.The villain cleared paths with the machete tool, then pitched the canvas tents.
2.The villain dropped the rope ladder, then lit the rescue flares.
3.The villain flashed the signal lantern, then stuffed the supply sack.
4.The villain grabbed the grappling hook, then pitched the canvas tents.
5.The villain flashed the signal lantern, then packed the canteen pack.
6.The villain swung the brass telescope, then stuffed the supply sack.
7.The villain cleared paths with the machete tool, then stuffed the supply sack.
8.The villain swung the brass telescope, then packed the canteen pack.
9.The villain swung the brass telescope, then lit the rescue flares.
10.The villain dropped the rope ladder, then pitched the canvas tents.
11.The villain cleared paths with the machete tool, then packed the canteen pack.
12.The villain grabbed the grappling hook, then packed the canteen pack.
Solve it
Name the culprit
Choose the one suspect left standing.
Answer Key — The Lost Compass Mystery
Culprit: Jack (Machete Tool · Supply Sack · Left Handed · Brown Fedora · Muddy Swamps)
- Clue 1 (Multiplication facts (1-12)): "THE VILLAIN DOES NOT CARRY CANVAS TENTS"12 × 6 = 72 (T) · 7 × 10 = 70 (N) · 9 × 1 = 9 (C) · 6 × 11 = 66 (L) · 5 × 11 = 55 (O) · 7 × 11 = 77 (I) · 11 × 3 = 33 (A) · 9 × 9 = 81 (E) · 5 × 5 = 25 (D) · 5 × 3 = 15 (H) · 7 × 3 = 21 (V) · 7 × 12 = 84 (R) · 12 × 10 = 120 (S) · 6 × 6 = 36 (Y)
- Clue 2 (Multi-step word problems): "LEFT HANDED"Scout collected 15 compasses in the morning and 37 compasses in the afternoon, then split them equally among 4 Explorers. How many compasses did each get? = 13 (L) · There were 250 flashlight batteries in all. 18 flashlight batteries were set aside. The rest were shared equally among 4 Explorers. How many flashlight batteries did each get? = 58 (T) · There were 291 flashlight batteries in all. 4 Explorers used 36 flashlight batteries each. The other 3 Explorers shared the rest equally. How many flashlight batteries did each of the other Explorers get? = 49 (N) · There were 342 flashlight batteries in all. 3 Explorers used 22 flashlight batteries each. The other 4 Explorers shared the rest equally. How many flashlight batteries did each of the other Explorers get? = 69 (F) · There were 152 canteen cups in all. 4 Explorers used 10 canteen cups each. The other 4 Explorers shared the rest equally. How many canteen cups did each of the other Explorers get? = 28 (A) · Scout collected 14 canteen cups in the morning and 136 canteen cups in the afternoon, then split them equally among 5 Explorers. How many canteen cups did each get? = 30 (E) · There were 363 compasses in all. 13 compasses were set aside. The rest were shared equally among 10 Explorers. How many compasses did each get? = 35 (H)
- Clue 3 (Rounding): "THE SNEAK STUMBLED IN MUDDY SWAMPS"Round 71 to the nearest ten = 70 (T) · Round 1,144 to the nearest hundred = 1100 (P) · Round 29 to the nearest ten = 30 (H) · Round 8,539 to the nearest thousand = 9000 (M) · Round 3,669 to the nearest hundred = 3700 (B) · Round 191 to the nearest hundred = 200 (E) · Round 108 to the nearest ten = 110 (L) · Round 167 to the nearest ten = 170 (D) · Round 1,301 to the nearest hundred = 1300 (A) · Round 17 to the nearest ten = 20 (S) · Round 133 to the nearest ten = 130 (Y) · Round 2,914 to the nearest hundred = 2900 (I) · Round 915 to the nearest hundred = 900 (U) · Round 2,836 to the nearest thousand = 3000 (K) · Round 429 to the nearest ten = 430 (W) · Round 452 to the nearest hundred = 500 (N)
- Clue 4 (Addition): "A STRAP FELL FROM A BROWN FEDORA"2018 + 4486 = 6504 (A) · 5878 + 2852 = 8730 (B) · 3763 + 4616 = 8379 (P) · 2649 + 2650 = 5299 (M) · 2657 + 5602 = 8259 (W) · 2591 + 4357 = 6948 (R) · 894 + 1404 = 2298 (E) · 3433 + 3253 = 6686 (D) · 3050 + 3013 = 6063 (T) · 1416 + 2827 = 4243 (S) · 4241 + 4956 = 9197 (N) · 3456 + 3748 = 7204 (L) · 5311 + 2992 = 8303 (O) · 2340 + 2892 = 5232 (F)
- Clue 5 (Missing addends): surviving statement (box 7) → Jack22 + ___ = 30 = 8 · 16 + ___ = 27 = 11 · 10 + ___ = 19 = 9 · 25 + ___ = 31 = 6 · 11 + ___ = 14 = 3 · 20 + ___ = 30 = 10 · 5 + ___ = 7 = 2 · 3 + ___ = 7 = 4 · 32 + ___ = 44 = 12 · 27 + ___ = 28 = 1 · 17 + ___ = 22 = 5
About this mystery
- Grade level
- Grade 4 math
- Math topics
- Multiplication, Multi-step word problems, Rounding, Addition, Missing addends
- Reading level
- grades 3-4
- Theme
- The Lost Compass Mystery — set in Craggy Monkey Island
- Format
- Interactive online & printable worksheet with answer key
- Solution
- One unique, verified culprit among 21 suspects