🚀 SpaceGrade 3Reading: grades 1-2AdditionSubtractionMultiplicationRoundingDivision
The Mystery of the Missing Moon Crystal
Someone broke into the observatory dome! The glowing Moon Crystal is gone. The Cosmic Bandit left space footprints all over. We need to look for clues and save the day!
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 | Space Suit Upgrade | Alien Gadget | Glove Hand | Hair Color | Energy Shield Weakness |
|---|---|---|---|---|---|
| Valentina | Gravity Boots | Sonic Beacon | Right Handed | Bright Blue Hair | Shiny Magnets |
| Chris | Gravity Boots | Plasma Rope | Left Handed | Bright Blue Hair | Shiny Magnets |
| John | Laser Cutter | Sonic Beacon | Right Handed | Star Silver Hair | Shiny Magnets |
| Yi | Gravity Boots | Force Field Generator | Right Handed | Bright Blue Hair | Bright Flashlights |
| Helen | Jetpack Booster | Force Field Generator | Left Handed | Bright Blue Hair | Shiny Magnets |
| Guion | Jetpack Booster | Cosmic Ray Blaster | Right Handed | Star Silver Hair | Shiny Magnets |
| Neil | Gravity Boots | Sonic Beacon | Left Handed | Star Silver Hair | Shiny Magnets |
| Fred | Jetpack Booster | Force Field Generator | Right Handed | Star Silver Hair | Bright Flashlights |
| Jim | Jetpack Booster | Gravity Warp Remote | Left Handed | Star Silver Hair | Bright Flashlights |
| Sally | Gravity Boots | Cosmic Ray Blaster | Right Handed | Neon Red Hair | Shiny Magnets |
| Anousheh | Cloaking Shield | Gravity Warp Remote | Right Handed | Star Silver Hair | Shiny Magnets |
| Samantha | Jetpack Booster | Force Field Generator | Left Handed | Star Silver Hair | Shiny Magnets |
| Guy | Laser Cutter | Plasma Rope | Right Handed | Bright Blue Hair | Shiny Magnets |
| Scott | Laser Cutter | Force Field Generator | Right Handed | Star Silver Hair | Shiny Magnets |
| Yuri | Jetpack Booster | Sonic Beacon | Right Handed | Neon Red Hair | Bright Flashlights |
| Mae | Robot Companion | Force Field Generator | Right Handed | Star Silver Hair | Shiny Magnets |
| Elena | Cloaking Shield | Gravity Warp Remote | Left Handed | Star Silver Hair | Cold Freeze Rays |
| Buzz | Gravity Boots | Sonic Beacon | Left Handed | Star Silver Hair | Bright Flashlights |
| Alan | Gravity Boots | Plasma Rope | Right Handed | Neon Red Hair | Shiny Magnets |
| Peggy | Robot Companion | Force Field Generator | Left Handed | Bright Blue Hair | Cold Freeze Rays |
| Tim | Robot Companion | Gravity Warp Remote | Left Handed | Bright Blue Hair | Shiny Magnets |
Clue 1
Addition
We need to count our space suits. Let us add the clean suits and the dirty suits to find the total.
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
813
865
841
T
813
865
652
841
910
683
570
841
465
677
570
T
813
455
465
841
320
632
432
320
431
652
T
813
779
382
320
432
376
432
841
308
570
T
813
841
404 + 409 =T
143 + 239 =W
239 + 413 =I
174 + 257 =V
357 + 320 =N
131 + 301 =R
297 + 168 =S
549 + 292 =E
393 + 386 =Y
370 + 313 =D
185 + 123 =M
357 + 553 =F
286 + 169 =U
226 + 406 =G
253 + 123 =P
200 + 370 =O
106 + 214 =A
341 + 524 =H
0/18 letters found
Clue 2
Subtraction
Oh no! Some moon rocks are missing from the lab bag. Subtract the rocks left from the start amount to see how many are gone.
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
660
108
683
594
602
732
683
228
228
683
753
T
660
108
683
861
163
T
660
T
660
882
669
778
806
T
660
108
T
660
108
683
806
732
732
806
595
108
T
660
108
142
669
753
1013 - 353 =T
774 - 105 =N
900 - 168 =R
201 - 38 =U
815 - 62 =D
963 - 102 =B
299 - 71 =S
164 - 56 =H
1035 - 352 =E
808 - 30 =W
745 - 150 =G
635 - 41 =Y
1194 - 312 =O
944 - 342 =P
914 - 108 =I
531 - 389 =A
0/16 letters found
Clue 3
Multiplication facts (1-12)
Let us check the rocket fuel packs. They are in equal rows. Multiply the rows to find the total fuel.
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
22
72
60
33
132
30
30
84
132
20
8
84
20
84
49
84
21
88
8
96
5
120
72
132
20
21
5
84
11
20
60
T
22
120
2 × 11 =T
11 × 8 =F
1 × 5 =M
11 × 12 =I
11 × 1 =G
1 × 8 =R
3 × 10 =L
7 × 12 =A
12 × 5 =E
10 × 12 =S
12 × 6 =H
2 × 10 =N
3 × 11 =V
8 × 12 =O
7 × 7 =W
3 × 7 =Y
0/16 letters found
Clue 4
Rounding
Our star scanner is a bit old. It rounds the distance of the escaping thief to the nearest ten.
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
500
700
200
20
300
20
7000
200
4000
T
500
700
6000
20
20
T
500
6000
30
20
60
900
2000
200
30
700
6000
60
30
Round 474 to the nearest hundredT
Round 295 to the nearest hundredU
Round 2,318 to the nearest thousandV
Round 5,649 to the nearest thousandA
Round 3,965 to the nearest thousandC
Round 17 to the nearest tenS
Round 893 to the nearest hundredL
Round 62 to the nearest tenI
Round 7,228 to the nearest thousandP
Round 32 to the nearest tenR
Round 723 to the nearest hundredH
Round 219 to the nearest hundredE
0/12 letters found
Clue 5
Division facts (1-12) — the last clue
We found a box of space snacks. We must share them equally among our crew to stay strong.
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
48 ÷ 4 = ?
50 ÷ 5 = ?
48 ÷ 6 = ?
12 ÷ 12 = ?
77 ÷ 11 = ?
18 ÷ 2 = ?
12 ÷ 6 = ?
121 ÷ 11 = ?
15 ÷ 5 = ?
24 ÷ 6 = ?
50 ÷ 10 = ?
Step 2 — cross out the sentence with each answer
1.The villain floats through the airlock, then hops into a tiny escape pod.
2.The villain disables the camera system, then climbs out the docking bay window.
3.The villain disables the camera system, then zips away on a space scooter.
4.The villain hacks the main console, then hops into a tiny escape pod.
5.The villain deactivates the gravity lock, then climbs out the docking bay window.
6.The villain deactivates the gravity lock, then hides inside a hollow asteroid.
7.The villain hacks the main console, then blasts off in a silver rocket.
8.The villain deactivates the gravity lock, then hops into a tiny escape pod.
9.The villain sneaks past the security drone, then blasts off in a silver rocket.
10.The villain disables the camera system, then hops into a tiny escape pod.
11.The villain sneaks past the security drone, then hides inside a hollow asteroid.
12.The villain floats through the airlock, then zips away on a space scooter.
Solve it
Name the culprit
Choose the one suspect left standing.
Answer Key — The Mystery of the Missing Moon Crystal
Culprit: John (Laser Cutter · Sonic Beacon · Right Handed · Star Silver Hair · Shiny Magnets)
- Clue 1 (Addition): "THE THIEF DOES NOT USE A GRAVITY WARP REMOTE"404 + 409 = 813 (T) · 143 + 239 = 382 (W) · 239 + 413 = 652 (I) · 174 + 257 = 431 (V) · 357 + 320 = 677 (N) · 131 + 301 = 432 (R) · 297 + 168 = 465 (S) · 549 + 292 = 841 (E) · 393 + 386 = 779 (Y) · 370 + 313 = 683 (D) · 185 + 123 = 308 (M) · 357 + 553 = 910 (F) · 286 + 169 = 455 (U) · 226 + 406 = 632 (G) · 253 + 123 = 376 (P) · 200 + 370 = 570 (O) · 106 + 214 = 320 (A) · 341 + 524 = 865 (H)
- Clue 2 (Subtraction): "THEY PRESSED THE BUTTON WITH THEIR RIGHT HAND"1013 - 353 = 660 (T) · 774 - 105 = 669 (N) · 900 - 168 = 732 (R) · 201 - 38 = 163 (U) · 815 - 62 = 753 (D) · 963 - 102 = 861 (B) · 299 - 71 = 228 (S) · 164 - 56 = 108 (H) · 1035 - 352 = 683 (E) · 808 - 30 = 778 (W) · 745 - 150 = 595 (G) · 635 - 41 = 594 (Y) · 1194 - 312 = 882 (O) · 944 - 342 = 602 (P) · 914 - 108 = 806 (I) · 531 - 389 = 142 (A)
- Clue 3 (Multiplication facts (1-12)): "THE VILLAIN RAN AWAY FROM SHINY MAGNETS"2 × 11 = 22 (T) · 11 × 8 = 88 (F) · 1 × 5 = 5 (M) · 11 × 12 = 132 (I) · 11 × 1 = 11 (G) · 1 × 8 = 8 (R) · 3 × 10 = 30 (L) · 7 × 12 = 84 (A) · 12 × 5 = 60 (E) · 10 × 12 = 120 (S) · 12 × 6 = 72 (H) · 2 × 10 = 20 (N) · 3 × 11 = 33 (V) · 8 × 12 = 96 (O) · 7 × 7 = 49 (W) · 3 × 7 = 21 (Y)
- Clue 4 (Rounding): "THE SUSPECT HAS STAR SILVER HAIR"Round 474 to the nearest hundred = 500 (T) · Round 295 to the nearest hundred = 300 (U) · Round 2,318 to the nearest thousand = 2000 (V) · Round 5,649 to the nearest thousand = 6000 (A) · Round 3,965 to the nearest thousand = 4000 (C) · Round 17 to the nearest ten = 20 (S) · Round 893 to the nearest hundred = 900 (L) · Round 62 to the nearest ten = 60 (I) · Round 7,228 to the nearest thousand = 7000 (P) · Round 32 to the nearest ten = 30 (R) · Round 723 to the nearest hundred = 700 (H) · Round 219 to the nearest hundred = 200 (E)
- Clue 5 (Division facts (1-12)): surviving statement (box 6) → John48 ÷ 4 = 12 · 50 ÷ 5 = 10 · 48 ÷ 6 = 8 · 12 ÷ 12 = 1 · 77 ÷ 11 = 7 · 18 ÷ 2 = 9 · 12 ÷ 6 = 2 · 121 ÷ 11 = 11 · 15 ÷ 5 = 3 · 24 ÷ 6 = 4 · 50 ÷ 10 = 5
About this mystery
- Grade level
- Grade 3 math
- Math topics
- Addition, Subtraction, Multiplication, Rounding, Division
- Reading level
- grades 1-2
- Theme
- The Mystery of the Missing Moon Crystal — set in The Star Base Alpha space station
- Format
- Interactive online & printable worksheet with answer key
- Solution
- One unique, verified culprit among 21 suspects