🚀 SpaceGrade 2Reading: grades 1-2Place valueAdditionSubtractionSkip countingMissing addends
The Moon Base Mystery
The golden star map has been taken from the Moon Base! We need to help the Space Rangers find who took it before the rocket launches.
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 Power | Suit Tool | Glove Hand | Visor Color | Weakness |
|---|---|---|---|---|---|
| Mae | Star Shield | Ice Freeze | Left-handed | Green visor | Space dust |
| Sunita | Star Shield | Glow Light | Left-handed | Gold visor | Space dust |
| Kimiya | Warp Speed | Glow Light | Right-handed | Green visor | Solar heat |
| Nick | Star Shield | Spark Tools | Left-handed | Gold visor | Magnet waves |
| Neil | Zero-G Float | Ice Freeze | Right-handed | Green visor | Magnet waves |
| Alan | Star Shield | Ice Freeze | Right-handed | Green visor | Space dust |
| Jessica | Laser Blast | Glow Light | Left-handed | Green visor | Magnet waves |
| Chris | Zero-G Float | Glow Light | Left-handed | Blue visor | Space dust |
| Kayla | Warp Speed | Magnetic Boots | Left-handed | Gold visor | Magnet waves |
| Scott | Star Shield | Spark Tools | Right-handed | Green visor | Solar heat |
| Elena | Star Shield | Magnetic Boots | Right-handed | Green visor | Magnet waves |
| Victor | Star Shield | Glow Light | Left-handed | Gold visor | Magnet waves |
| Peggy | Warp Speed | Ice Freeze | Right-handed | Green visor | Magnet waves |
| Kalpana | Laser Blast | Radio Beam | Right-handed | Green visor | Magnet waves |
| Christina | Rocket Boost | Magnetic Boots | Left-handed | Blue visor | Solar heat |
| Yuri | Rocket Boost | Magnetic Boots | Right-handed | Gold visor | Magnet waves |
| Guion | Star Shield | Radio Beam | Right-handed | Blue visor | Space dust |
| Sally | Laser Blast | Glow Light | Left-handed | Gold visor | Magnet waves |
| John | Rocket Boost | Radio Beam | Right-handed | Gold visor | Solar heat |
| Drew | Zero-G Float | Spark Tools | Right-handed | Green visor | Magnet waves |
| Frank | Zero-G Float | Radio Beam | Right-handed | Green visor | Magnet waves |
Clue 1
Place value
A computer screen shows a scrambled code. Look at the tens and ones to find the clue.
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
82
91
37
29
54
22
22
81
54
64
79
14
37
43
64
14
T
82
33
43
37
54
52
37
68
47
37
37
75
37
What number has 8 tens and 2 ones?T
What number has 6 tens and 4 ones?N
What number has 4 tens and 7 ones?R
What number has 2 tens and 9 ones?V
What number has 7 tens and 9 ones?D
What number has 9 tens and 1 one?H
What number has 5 tens and 4 ones?I
What number has 1 ten and 4 ones?O
What number has 7 tens and 5 ones?Z
What number has 3 tens and 3 ones?U
What number has 3 tens and 7 ones?E
What number has 8 tens and 1 one?A
What number has 2 tens and 2 ones?L
What number has 6 tens and 8 ones?F
What number has 5 tens and 2 ones?C
What number has 4 tens and 3 ones?S
0/16 letters found
Clue 2
Addition
We found two piles of shiny moon rocks. Add them together to unlock the next hint.
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
51
41
49
90
43
92
92
29
43
87
65
50
49
50
29
81
43
54
41
T
51
41
29
87
71
49
71
54
92
25
90
49
16 + 35 =T
57 + 33 =V
30 + 24 =G
24 + 47 =D
29 + 52 =R
59 + 33 =L
25 + 25 =S
19 + 22 =H
40 + 25 =U
29 + 14 =I
51 + 36 =N
29 + 20 =E
8 + 17 =O
9 + 20 =A
0/14 letters found
Clue 3
Subtraction
Our rocket is leaking fuel blocks. Subtract the lost ones to see where the villain went.
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
27
74
39
17
13
49
49
56
13
68
13
70
70
T
27
16
40
40
39
59
81
32
86
56
23
68
39
T
27
30
56
17
39
70
35 - 8 =T
61 - 12 =L
61 - 38 =G
89 - 3 =M
29 - 12 =V
55 - 16 =E
15 - 2 =I
85 - 4 =B
84 - 14 =S
46 - 16 =W
76 - 20 =A
71 - 39 =Y
32 - 16 =O
100 - 32 =N
93 - 19 =H
88 - 29 =D
48 - 8 =P
0/17 letters found
Clue 4
Skip counting
We see rows of heavy space boots. Skip count them to unlock the metal locker.
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
45
22
80
10
80
70
60
80
60
22
70
24
70
33
60
80
80
42
28
30
24
100
60
Skip-count by 5s. Fill the blank: 5, 10, 15, 20, 25, 30, 35, 40, ___, 50, 55T
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, 10, 12, 14, 16, 18, 20, ___, 24, 26H
Skip-count by 2s. Fill the blank: 2, 4, 6, 8, 10, 12, 14, 16, 18, 20, 22, 24, 26, ___, 30, 32V
Skip-count by 3s. Fill the blank: 3, 6, 9, 12, 15, 18, 21, 24, 27, 30, ___, 36, 39G
Skip-count by 10s. Fill the blank: 10, 20, 30, 40, 50, 60, ___, 80, 90A
Skip-count by 3s. Fill the blank: 3, 6, 9, 12, 15, 18, 21, 24, 27, 30, 33, 36, 39, ___, 45, 48N
Skip-count by 5s. Fill the blank: 5, 10, 15, 20, 25, ___, 35, 40I
Skip-count by 3s. Fill the blank: 3, 6, 9, 12, 15, 18, 21, ___, 27, 30S
Skip-count by 10s. Fill the blank: 10, 20, 30, 40, 50, 60, 70, ___, 90, 100E
Skip-count by 2s. Fill the blank: 2, 4, 6, 8, ___, 12, 14W
Skip-count by 5s. Fill the blank: 5, 10, 15, 20, 25, 30, 35, 40, 45, 50, 55, ___, 65, 70R
0/12 letters found
Clue 5
Missing addends — the last clue
The ship needs more batteries to start. Find how many are missing to get the final clue.
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
7 + ___ = 8
6 + ___ = 11
2 + ___ = 11
2 + ___ = 8
3 + ___ = 15
4 + ___ = 7
9 + ___ = 20
6 + ___ = 8
2 + ___ = 12
9 + ___ = 16
9 + ___ = 13
Step 2 — cross out the sentence with each answer
1.The villain blasts a laser at the safe, then beams a radio signal to a ship.
2.The villain floats in zero gravity, then freezes the security camera with ice.
3.The villain boosts away on rocket power, then walks up the metal wall with magnetic boots.
4.The villain boosts away on rocket power, then beams a radio signal to a ship.
5.The villain blocks the door with a star shield, then walks up the metal wall with magnetic boots.
6.The villain blasts a laser at the safe, then walks up the metal wall with magnetic boots.
7.The villain runs fast at warp speed, then beams a radio signal to a ship.
8.The villain floats in zero gravity, then beams a radio signal to a ship.
9.The villain floats in zero gravity, then fixes the lock with spark tools.
10.The villain blasts a laser at the safe, then freezes the security camera with ice.
11.The villain blocks the door with a star shield, then beams a radio signal to a ship.
12.The villain boosts away on rocket power, then freezes the security camera with ice.
Solve it
Name the culprit
Choose the one suspect left standing.
Answer Key — The Moon Base Mystery
Culprit: Frank (Zero-G Float · Radio Beam · Right-handed · Green visor · Magnet waves)
- Clue 1 (Place value): "THE VILLAIN DOES NOT USE ICE FREEZE"What number has 8 tens and 2 ones? = 82 (T) · What number has 6 tens and 4 ones? = 64 (N) · What number has 4 tens and 7 ones? = 47 (R) · What number has 2 tens and 9 ones? = 29 (V) · What number has 7 tens and 9 ones? = 79 (D) · What number has 9 tens and 1 one? = 91 (H) · What number has 5 tens and 4 ones? = 54 (I) · What number has 1 ten and 4 ones? = 14 (O) · What number has 7 tens and 5 ones? = 75 (Z) · What number has 3 tens and 3 ones? = 33 (U) · What number has 3 tens and 7 ones? = 37 (E) · What number has 8 tens and 1 one? = 81 (A) · What number has 2 tens and 2 ones? = 22 (L) · What number has 6 tens and 8 ones? = 68 (F) · What number has 5 tens and 2 ones? = 52 (C) · What number has 4 tens and 3 ones? = 43 (S)
- Clue 2 (Addition): "THE VILLAIN USES A RIGHT HANDED GLOVE"16 + 35 = 51 (T) · 57 + 33 = 90 (V) · 30 + 24 = 54 (G) · 24 + 47 = 71 (D) · 29 + 52 = 81 (R) · 59 + 33 = 92 (L) · 25 + 25 = 50 (S) · 19 + 22 = 41 (H) · 40 + 25 = 65 (U) · 29 + 14 = 43 (I) · 51 + 36 = 87 (N) · 29 + 20 = 49 (E) · 8 + 17 = 25 (O) · 9 + 20 = 29 (A)
- Clue 3 (Subtraction): "THE VILLAIN IS STOPPED BY MAGNET WAVES"35 - 8 = 27 (T) · 61 - 12 = 49 (L) · 61 - 38 = 23 (G) · 89 - 3 = 86 (M) · 29 - 12 = 17 (V) · 55 - 16 = 39 (E) · 15 - 2 = 13 (I) · 85 - 4 = 81 (B) · 84 - 14 = 70 (S) · 46 - 16 = 30 (W) · 76 - 20 = 56 (A) · 71 - 39 = 32 (Y) · 32 - 16 = 16 (O) · 100 - 32 = 68 (N) · 93 - 19 = 74 (H) · 88 - 29 = 59 (D) · 48 - 8 = 40 (P)
- Clue 4 (Skip counting): "THE WEARER HAS A GREEN VISOR"Skip-count by 5s. Fill the blank: 5, 10, 15, 20, 25, 30, 35, 40, ___, 50, 55 = 45 (T) · Skip-count by 10s. Fill the blank: 10, 20, 30, 40, 50, 60, 70, 80, 90, ___, 110, 120 = 100 (O) · Skip-count by 2s. Fill the blank: 2, 4, 6, 8, 10, 12, 14, 16, 18, 20, ___, 24, 26 = 22 (H) · Skip-count by 2s. Fill the blank: 2, 4, 6, 8, 10, 12, 14, 16, 18, 20, 22, 24, 26, ___, 30, 32 = 28 (V) · Skip-count by 3s. Fill the blank: 3, 6, 9, 12, 15, 18, 21, 24, 27, 30, ___, 36, 39 = 33 (G) · Skip-count by 10s. Fill the blank: 10, 20, 30, 40, 50, 60, ___, 80, 90 = 70 (A) · Skip-count by 3s. Fill the blank: 3, 6, 9, 12, 15, 18, 21, 24, 27, 30, 33, 36, 39, ___, 45, 48 = 42 (N) · Skip-count by 5s. Fill the blank: 5, 10, 15, 20, 25, ___, 35, 40 = 30 (I) · Skip-count by 3s. Fill the blank: 3, 6, 9, 12, 15, 18, 21, ___, 27, 30 = 24 (S) · Skip-count by 10s. Fill the blank: 10, 20, 30, 40, 50, 60, 70, ___, 90, 100 = 80 (E) · Skip-count by 2s. Fill the blank: 2, 4, 6, 8, ___, 12, 14 = 10 (W) · Skip-count by 5s. Fill the blank: 5, 10, 15, 20, 25, 30, 35, 40, 45, 50, 55, ___, 65, 70 = 60 (R)
- Clue 5 (Missing addends): surviving statement (box 8) → Frank7 + ___ = 8 = 1 · 6 + ___ = 11 = 5 · 2 + ___ = 11 = 9 · 2 + ___ = 8 = 6 · 3 + ___ = 15 = 12 · 4 + ___ = 7 = 3 · 9 + ___ = 20 = 11 · 6 + ___ = 8 = 2 · 2 + ___ = 12 = 10 · 9 + ___ = 16 = 7 · 9 + ___ = 13 = 4
About this mystery
- Grade level
- Grade 2 math
- Math topics
- Place value, Addition, Subtraction, Skip counting, Missing addends
- Reading level
- grades 1-2
- Theme
- The Moon Base Mystery — set in Moon Base Alpha
- Format
- Interactive online & printable worksheet with answer key
- Solution
- One unique, verified culprit among 21 suspects