Grade 7Reading: grades 5-6AdditionSubtractionMultiplicationMulti-step word problemsTwo-step equations
The Case of the Missing Star Chart
While sailing high above the Cloud Archipelago, someone broke into the chart room and snatched the ancient Star Chart! The Chief Cartographer needs your help examining evidence to find which suspect aboard the airship is 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 | Gadget Tool | Flight Gear | Dominant Hand | Hair Style | Distraction Trap |
|---|---|---|---|---|---|
| Toby Draft | Wind Blast | Signal Flares | Left Handed | Copper Curls | Lemon Juice |
| Leo Zephyr | Echo Pulse | Glider Wings | Right Handed | Copper Curls | Lemon Juice |
| Jasper Vane | Echo Pulse | Signal Flares | Right Handed | Copper Curls | Lemon Juice |
| Nico Cirrus | Echo Pulse | Brass Goggles | Right Handed | Copper Curls | Loud Whistle |
| Piper Trade | Wind Blast | Jet Pack | Right Handed | Raven Spikes | Lemon Juice |
| Rowan Breeze | Wind Blast | Brass Goggles | Left Handed | Copper Curls | Bright Light |
| Captain Avery | Echo Pulse | Signal Flares | Right Handed | Copper Curls | Bright Light |
| Stella Squall | Echo Pulse | Magnetic Boots | Right Handed | Copper Curls | Lemon Juice |
| Hazel Tempest | Echo Pulse | Magnetic Boots | Right Handed | Copper Curls | Loud Whistle |
| Kira Skye | Starlight Beam | Magnetic Boots | Right Handed | Copper Curls | Loud Whistle |
| Drake Vance | Wind Blast | Glider Wings | Right Handed | Copper Curls | Loud Whistle |
| Flynn Horizon | Starlight Beam | Signal Flares | Left Handed | Copper Curls | Lemon Juice |
| Barnaby Finch | Wind Blast | Signal Flares | Right Handed | Raven Spikes | Lemon Juice |
| Quinn Gust | Starlight Beam | Glider Wings | Right Handed | Copper Curls | Lemon Juice |
| Cora Sterling | Grapple Hook | Glider Wings | Right Handed | Silver Braid | Bright Light |
| Ignatius Swift | Starlight Beam | Signal Flares | Left Handed | Silver Braid | Loud Whistle |
| Victor Mist | Smoke Bomb | Signal Flares | Right Handed | Silver Braid | Lemon Juice |
| Mina Stratus | Wind Blast | Signal Flares | Right Handed | Silver Braid | Loud Whistle |
| Xander Ridge | Starlight Beam | Glider Wings | Right Handed | Silver Braid | Lemon Juice |
| Orla Nimbus | Smoke Bomb | Magnetic Boots | Right Handed | Silver Braid | Lemon Juice |
| Gideon Gale | Smoke Bomb | Signal Flares | Right Handed | Copper Curls | Lemon Juice |
Clue 1
Addition
The navigator adds up all the missing compass shards found on the deck to reveal the first piece of evidence.
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
6242
6245
3231
6029
3925
8250
2156
3231
6493
3925
3231
6079
2376
3925
T
6242
2156
6079
3231
6136
9405
8250
2376
3231
T
6242
4869
3074
5256
3925
3925
T
6242
6079
2693 + 3549 =T
6199 + 3206 =A
2271 + 3974 =H
4122 + 1907 =R
2047 + 1184 =E
4869 + 3381 =G
1688 + 2237 =O
1818 + 3051 =I
2576 + 3560 =M
965 + 1411 =N
3318 + 1938 =B
2722 + 3357 =S
1721 + 1353 =C
760 + 1396 =U
3513 + 2980 =D
0/15 letters found
Clue 2
Subtraction
By subtracting the ruined deck log entries from the total pages, the crew pinpoints when the thief struck.
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
3771
1980
1755
1148
6951
1148
8138
1755
5687
T
3771
3471
1148
8440
3471
5550
1980
T
3771
1980
3453
3039
1243
1755
1243
6879 - 3108 =T
2426 - 1183 =D
3650 - 611 =N
2548 - 1400 =S
10913 - 3962 =U
5411 - 1940 =I
7797 - 2110 =C
9337 - 1199 =P
10852 - 2412 =R
5070 - 3090 =H
10283 - 4733 =G
3902 - 449 =A
6238 - 4483 =E
0/13 letters found
Clue 3
Multiplication facts (1-12)
The ship engineer multiplies the rows of crate stacks to search every shelf for hidden villain gear.
Solve each problem to learn its letter. Then write that letter in every box that shows the same number, and read the secret clue.
L
10
72
2
49
64
120
25
66
8
72
55
36
49
40
55
36
121
72
108
49
84
25
72
66
64
36
108
77
8
63
55
1 × 10 =L
2 × 4 =C
7 × 9 =K
5 × 11 =S
12 × 10 =J
7 × 7 =O
1 × 2 =M
7 × 12 =G
8 × 8 =N
5 × 5 =U
7 × 11 =A
11 × 11 =H
10 × 4 =P
12 × 9 =R
6 × 11 =I
4 × 9 =T
8 × 9 =E
0/17 letters found
Clue 4
Multi-step word problems
The detective solves a multi-step word problem tracking fuel usage and wind speeds to follow the rogue.
Solve each problem to learn its letter, then write the letters in the boxes to fill in the missing word.
Astrandof hairturnedupatthescene.
C
77
25
38
38
30
73
C
77
48
73
29
S
There were 486 compasses in all. 24 compasses were set aside. The rest were shared equally among 6 Airship Crew. How many compasses did each get?C
There were 155 cloud crystals in all. 1 Airship Crew used 39 cloud crystals each. The other 4 Airship Crew shared the rest equally. How many cloud crystals did each of the other Airship Crew get?L
There were 670 brass gears in all. 13 brass gears were set aside. The rest were shared equally among 9 Airship Crew. How many brass gears did each get?R
There were 149 brass gears in all. 29 brass gears were set aside. The rest were shared equally among 4 Airship Crew. How many brass gears did each get?E
Cartographer earned 3 spyglasses in each of 6 rounds, plus 11 bonus spyglasses. Then 4 spyglasses were lost. How many spyglasses are left?O
There were 274 brass gears in all. 34 brass gears were set aside. The rest were shared equally among 5 Airship Crew. How many brass gears did each get?U
Cartographer earned 8 sky maps in each of 2 rounds, plus 30 bonus sky maps. Then 8 sky maps were lost. How many sky maps are left?P
0/7 letters found
Clue 5
Two-step equations — the last clue
The captain uses a two-step scale equation with brass counterweights to unlock the final secret vault.
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
2x + 10 = 30, x = ?
5x + 4 = 64, x = ?
4x + 3 = 11, x = ?
3x + 10 = 34, x = ?
4x + 10 = 30, x = ?
3x + 1 = 4, x = ?
2x + 4 = 26, x = ?
4x + 1 = 17, x = ?
6x + 12 = 66, x = ?
2x + 9 = 23, x = ?
2x + 9 = 15, x = ?
Step 2 — cross out the sentence with each answer
1.The villain vanished behind a thick smoke bomb, then marched up the hull wearing magnetic boots.
2.The villain zapped the compass with a starlight beam, then escaped into the clouds using glider wings.
3.The villain snatched the golden quadrant with a grapple hook, then spied through the fog with brass goggles.
4.The villain snatched the golden quadrant with a grapple hook, then marched up the hull wearing magnetic boots.
5.The villain vanished behind a thick smoke bomb, then spied through the fog with brass goggles.
6.The villain scrambled the radar with an echo pulse, then signaled the fleet with signal flares.
7.The villain scrambled the radar with an echo pulse, then marched up the hull wearing magnetic boots.
8.The villain blew open the chart room with a wind blast, then signaled the fleet with signal flares.
9.The villain snatched the golden quadrant with a grapple hook, then zoomed over the deck using a jet pack.
10.The villain scrambled the radar with an echo pulse, then escaped into the clouds using glider wings.
11.The villain vanished behind a thick smoke bomb, then escaped into the clouds using glider wings.
12.The villain vanished behind a thick smoke bomb, then signaled the fleet with signal flares.
Solve it
Name the culprit
Choose the one suspect left standing.
Answer Key — The Case of the Missing Star Chart
Culprit: Jasper Vane (Echo Pulse · Signal Flares · Right Handed · Copper Curls · Lemon Juice)
- Clue 1 (Addition): "THE ROGUE DOES NOT USE MAGNETIC BOOTS"2693 + 3549 = 6242 (T) · 6199 + 3206 = 9405 (A) · 2271 + 3974 = 6245 (H) · 4122 + 1907 = 6029 (R) · 2047 + 1184 = 3231 (E) · 4869 + 3381 = 8250 (G) · 1688 + 2237 = 3925 (O) · 1818 + 3051 = 4869 (I) · 2576 + 3560 = 6136 (M) · 965 + 1411 = 2376 (N) · 3318 + 1938 = 5256 (B) · 2722 + 3357 = 6079 (S) · 1721 + 1353 = 3074 (C) · 760 + 1396 = 2156 (U) · 3513 + 2980 = 6493 (D)
- Clue 2 (Subtraction): "THE SUSPECT IS RIGHT HANDED"6879 - 3108 = 3771 (T) · 2426 - 1183 = 1243 (D) · 3650 - 611 = 3039 (N) · 2548 - 1400 = 1148 (S) · 10913 - 3962 = 6951 (U) · 5411 - 1940 = 3471 (I) · 7797 - 2110 = 5687 (C) · 9337 - 1199 = 8138 (P) · 10852 - 2412 = 8440 (R) · 5070 - 3090 = 1980 (H) · 10283 - 4733 = 5550 (G) · 3902 - 449 = 3453 (A) · 6238 - 4483 = 1755 (E)
- Clue 3 (Multiplication facts (1-12)): "LEMON JUICE STOPS THE ROGUE IN TRACKS"1 × 10 = 10 (L) · 2 × 4 = 8 (C) · 7 × 9 = 63 (K) · 5 × 11 = 55 (S) · 12 × 10 = 120 (J) · 7 × 7 = 49 (O) · 1 × 2 = 2 (M) · 7 × 12 = 84 (G) · 8 × 8 = 64 (N) · 5 × 5 = 25 (U) · 7 × 11 = 77 (A) · 11 × 11 = 121 (H) · 10 × 4 = 40 (P) · 12 × 9 = 108 (R) · 6 × 11 = 66 (I) · 4 × 9 = 36 (T) · 8 × 9 = 72 (E)
- Clue 4 (Multi-step word problems): "COPPER CURLS"There were 486 compasses in all. 24 compasses were set aside. The rest were shared equally among 6 Airship Crew. How many compasses did each get? = 77 (C) · There were 155 cloud crystals in all. 1 Airship Crew used 39 cloud crystals each. The other 4 Airship Crew shared the rest equally. How many cloud crystals did each of the other Airship Crew get? = 29 (L) · There were 670 brass gears in all. 13 brass gears were set aside. The rest were shared equally among 9 Airship Crew. How many brass gears did each get? = 73 (R) · There were 149 brass gears in all. 29 brass gears were set aside. The rest were shared equally among 4 Airship Crew. How many brass gears did each get? = 30 (E) · Cartographer earned 3 spyglasses in each of 6 rounds, plus 11 bonus spyglasses. Then 4 spyglasses were lost. How many spyglasses are left? = 25 (O) · There were 274 brass gears in all. 34 brass gears were set aside. The rest were shared equally among 5 Airship Crew. How many brass gears did each get? = 48 (U) · Cartographer earned 8 sky maps in each of 2 rounds, plus 30 bonus sky maps. Then 8 sky maps were lost. How many sky maps are left? = 38 (P)
- Clue 5 (Two-step equations): surviving statement (box 6) → Jasper Vane2x + 10 = 30, x = 10 · 5x + 4 = 64, x = 12 · 4x + 3 = 11, x = 2 · 3x + 10 = 34, x = 8 · 4x + 10 = 30, x = 5 · 3x + 1 = 4, x = 1 · 2x + 4 = 26, x = 11 · 4x + 1 = 17, x = 4 · 6x + 12 = 66, x = 9 · 2x + 9 = 23, x = 7 · 2x + 9 = 15, x = 3
About this mystery
- Grade level
- Grade 7 math
- Math topics
- Addition, Subtraction, Multiplication, Multi-step word problems, Two-step equations
- Reading level
- grades 5-6
- Theme
- The Case of the Missing Star Chart — set in Aboard the High-Flying Airship Zephyr
- Format
- Interactive online & printable worksheet with answer key
- Solution
- One unique, verified culprit among 21 suspects