Math Mysteries
Grade 3Reading: grades 3-4AdditionSkip countingPlace valueRoundingDivision

The Great Sky Chase

The floating islands of Aviaria are in deep trouble! The legendary Golden Propeller has been stolen from the Cloud Keepers. Without it, the islands will slowly float down into the misty depths below. A mysterious Sky Bandit was spotted escaping through the clouds. Chief Cloud Keeper Wendy needs your help to crack the clues, track down the bandit, and save the islands!

Suspects

Possible suspects

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

21 of 21 still in play
NameAirship GearSky GadgetSteering GripSky Hair ColorWeakness
Tom Sawyerturbo propellergrappling hookright handedorange hairloud whistles
Sherlock Holmeshelium balloonsmoke bombleft handedorange hairbright lights
Bessie Colemanhelium ballooncloud gliderleft handedorange hairloud whistles
John Watsonhelium balloonradar gogglesleft handedblack hairtickle feathers
Sally Ridesolar wingsnet launcherright handedsilver hairtickle feathers
Wendy Darlingwind sailsnet launcherright handedorange hairbright lights
Dorothy Galehelium balloonsmoke bombleft handedblack hairtickle feathers
Baron Von Richthofensolar wingscloud gliderright handedblack hairloud whistles
Alice Liddellhelium ballooncloud gliderright handedsilver hairbright lights
Wilbur Wrighthelium balloonsmoke bombleft handedblack hairbright lights
Nancy Drewwind sailsradar gogglesright handedsilver hairtickle feathers
Nellie Blywind sailssmoke bombleft handedorange hairloud whistles
Peter Panturbo propellersmoke bombright handedorange hairtickle feathers
Sinbadsteam enginegrappling hookright handedsilver hairloud whistles
Huckleberry Finnwind sailscloud gliderleft handedsilver hairbright lights
Phileas Foggturbo propellernet launcherright handedsilver hairtickle feathers
Marco Poloturbo propellersmoke bombright handedsilver hairtickle feathers
Captain Nemosolar wingscloud gliderright handedsilver hairtickle feathers
Jim Hawkinshelium ballooncloud gliderleft handedsilver hairtickle feathers
Amelia Earhartwind sailsgrappling hookleft handedblack hairbright lights
Charles Lindberghsolar wingsgrappling hookright handedsilver hairbright lights
Clue 1

Addition

We found a logbook left in the hangar. We must add up the fuel barrels counted this morning to unlock the first page.

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
850
671
857
925
234
907
357
491
T
850
357
221
857
826
907
221
T
850
419
826
857
957
234
357
234
957
359
221
359
359
944
857
826
332 + 518 =T
274 + 217 =I
76 + 158 =A
141 + 218 =G
294 + 125 =U
355 + 471 =S
107 + 114 =O
215 + 142 =D
400 + 544 =L
640 + 285 =B
242 + 429 =H
609 + 298 =N
380 + 577 =R
259 + 598 =E
0/14 letters found
Clue 2

Skip counting

The hangar doors are locked tight. The keypad needs us to complete the skip counting pattern of brass gears to open up.

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
120
50
14
30
100
55
T
120
35
100
10
110
80
14
35
14
39
35
65
26
26
14
130
28
9
22
35
65
39
50
T
120
50
22
55
130
Skip-count by 10s. Fill the blank: 10, 20, 30, 40, 50, 60, 70, 80, 90, 100, 110, ___, 130, 140T
Skip-count by 5s. Fill the blank: 5, 10, 15, 20, 25, 30, 35, 40, 45, 50, ___, 60, 65N
Skip-count by 2s. Fill the blank: 2, 4, 6, 8, 10, 12, 14, 16, 18, 20, ___, 24, 26A
Skip-count by 10s. Fill the blank: 10, 20, 30, 40, 50, 60, 70, 80, 90, ___, 110, 120O
Skip-count by 2s. Fill the blank: 2, 4, 6, 8, ___, 12, 14L
Skip-count by 5s. Fill the blank: 5, 10, 15, 20, 25, 30, 35, 40, 45, ___, 55, 60H
Skip-count by 10s. Fill the blank: 10, 20, 30, 40, 50, 60, 70, 80, 90, 100, ___, 120, 130S
Skip-count by 5s. Fill the blank: 5, 10, 15, 20, 25, 30, ___, 40, 45R
Skip-count by 10s. Fill the blank: 10, 20, 30, 40, 50, 60, 70, 80, 90, 100, 110, 120, ___, 140, 150D
Skip-count by 3s. Fill the blank: 3, 6, ___, 12, 15Y
Skip-count by 3s. Fill the blank: 3, 6, 9, 12, 15, 18, 21, 24, 27, 30, 33, 36, ___, 42, 45G
Skip-count by 2s. Fill the blank: 2, 4, 6, 8, 10, 12, ___, 16, 18E
Skip-count by 2s. Fill the blank: 2, 4, 6, 8, 10, 12, 14, 16, 18, 20, 22, 24, ___, 28, 30P
Skip-count by 10s. Fill the blank: 10, 20, 30, 40, 50, 60, 70, ___, 90, 100W
Skip-count by 5s. Fill the blank: 5, 10, 15, 20, 25, 30, 35, 40, 45, 50, 55, 60, ___, 70, 75I
Skip-count by 3s. Fill the blank: 3, 6, 9, 12, 15, 18, 21, 24, 27, ___, 33, 36C
Skip-count by 2s. Fill the blank: 2, 4, 6, 8, 10, 12, 14, 16, 18, 20, 22, 24, 26, ___, 30, 32B
0/17 letters found
Clue 3

Place value

A secret message is written in a digit code on the dashboard. We must find the value of the hundreds place to read it.

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
700
600
1000
900
500
30
30
2000
500
50
8000
2000
50
70
8000
7000
4000
T
700
500
90
9000
30
1000
70
1000
2000
T
700
600
1000
8000
60
What is the value of the 7 in 735?T
What is the value of the 9 in 79,661?K
What is the value of the 9 in 2,597?C
What is the value of the 6 in 631?H
What is the value of the 3 in 9,738?L
What is the value of the 5 in 512?I
What is the value of the 6 in 2,867?S
What is the value of the 8 in 8,105?R
What is the value of the 7 in 9,974?F
What is the value of the 5 in 4,057?N
What is the value of the 4 in 4,531?M
What is the value of the 7 in 57,023?O
What is the value of the 1 in 1,403?E
What is the value of the 9 in 3,983?V
What is the value of the 2 in 2,396?A
0/15 letters found
Clue 4

Rounding

Our sky radar is fuzzy and can only show rounded numbers. Round the distance of the escaping airship to lock our scanner on them.

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
600
700
500
60
70
30
90
900
20
4000
50
30
90
900
60
500
900
8000
6000
400
700
4000
200
50
8000
4000
Round 579 to the nearest hundredW
Round 3,880 to the nearest thousandR
Round 54 to the nearest tenA
Round 153 to the nearest hundredH
Round 33 to the nearest tenN
Round 707 to the nearest hundredE
Round 68 to the nearest tenU
Round 62 to the nearest tenO
Round 16 to the nearest tenT
Round 7,806 to the nearest thousandI
Round 549 to the nearest hundredF
Round 6,095 to the nearest thousandL
Round 910 to the nearest hundredS
Round 427 to the nearest hundredV
Round 89 to the nearest tenD
0/15 letters found
Clue 5

Division facts (1-12) — the last clue

To power up our pursuit glider, we need to divide the spare batteries equally among our spark plugs.

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
88 ÷ 11 = ?
110 ÷ 11 = ?
44 ÷ 11 = ?
18 ÷ 6 = ?
12 ÷ 6 = ?
35 ÷ 7 = ?
24 ÷ 4 = ?
70 ÷ 10 = ?
60 ÷ 5 = ?
6 ÷ 6 = ?
54 ÷ 6 = ?
Step 2 — cross out the sentence with each answer
1.The villain fired up the steam engine, then soared off on a cloud glider.
2.The villain inflated the helium balloon, then fired a heavy net launcher.
3.The villain fired up the steam engine, then fired a heavy net launcher.
4.The villain stretched out the solar wings, then soared off on a cloud glider.
5.The villain inflated the helium balloon, then scanned the horizon with radar goggles.
6.The villain stretched out the solar wings, then swung away on a grappling hook.
7.The villain fired up the steam engine, then scanned the horizon with radar goggles.
8.The villain started up the turbo propeller, then fired a heavy net launcher.
9.The villain unfurled the giant wind sails, then swung away on a grappling hook.
10.The villain started up the turbo propeller, then vanished inside a smoke bomb.
11.The villain stretched out the solar wings, then fired a heavy net launcher.
12.The villain started up the turbo propeller, then swung away on a grappling hook.
Solve it

Name the culprit

Choose the one suspect left standing.

About this mystery

Grade level
Grade 3 math
Math topics
Addition, Skip counting, Place value, Rounding, Division
Reading level
grades 3-4
Theme
The Great Sky Chase — set in the floating islands of Aviaria
Format
Interactive online & printable worksheet with answer key
Solution
One unique, verified culprit among 21 suspects

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