🚀 SpaceGrade 2Reading: grades 3-4Place valueAdditionSubtractionSkip countingMissing addends
The Astro Base Heist
An alarm blares across Astro Base Alpha! A mysterious Cosmic Phantom has snuck into the command module and stolen the legendary Golden Star Map. The Chief Astronomer needs your math skills to track down the thief before they escape the galaxy!
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 | Suit Power | Glove Power | Pilot Style | Hair Color | System Weakness |
|---|---|---|---|---|---|
| Joan | shield defense | warp dash | right handed | orange hair | ice blast |
| Chris | gravity control | magnetic grip | left handed | blue hair | strong magnets |
| Alexey | rocket flight | mech power | left handed | blue hair | bright flash |
| Winston | shield defense | warp dash | left handed | orange hair | strong magnets |
| Kalpana | cloak stealth | sonic boom | right handed | orange hair | strong magnets |
| Neil | rocket flight | warp dash | left handed | blue hair | strong magnets |
| Mark | gravity control | mech power | left handed | green hair | bright flash |
| Tim | cloak stealth | freeze ray | left handed | blue hair | strong magnets |
| Yuri | rocket flight | warp dash | left handed | orange hair | strong magnets |
| Guy | gravity control | warp dash | left handed | orange hair | bright flash |
| Mae | cloak stealth | sonic boom | left handed | blue hair | strong magnets |
| Peggy | rocket flight | freeze ray | right handed | orange hair | strong magnets |
| Valentina | cloak stealth | freeze ray | right handed | green hair | bright flash |
| Eileen | laser blasting | magnetic grip | right handed | blue hair | strong magnets |
| Scott | rocket flight | warp dash | right handed | blue hair | strong magnets |
| Sunita | shield defense | mech power | left handed | blue hair | ice blast |
| Alan | laser blasting | warp dash | right handed | blue hair | strong magnets |
| Buzz | gravity control | warp dash | right handed | blue hair | bright flash |
| Guion | shield defense | warp dash | left handed | blue hair | strong magnets |
| Glenn | rocket flight | magnetic grip | right handed | orange hair | ice blast |
| Franklin | shield defense | magnetic grip | right handed | orange hair | bright flash |
Clue 1
Place value
We found a glowing cargo screen that locked up. To reboot it and read the first clue, we must find the value of the digit in the tens place.
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
77
45
39
64
15
64
82
39
42
T
77
87
24
39
64
36
24
T
77
15
64
39
11
29
51
36
39
T
77
79
42
51
21
79
82
What number has 7 tens and 7 ones?T
What number has 2 tens and 9 ones?A
What number has 3 tens and 6 ones?N
What number has 4 tens and 2 ones?C
What number has 6 tens and 4 ones?S
What number has 8 tens and 7 ones?D
What number has 7 tens and 9 ones?I
What number has 4 tens and 5 ones?H
What number has 3 tens and 9 ones?E
What number has 8 tens and 2 ones?P
What number has 1 ten and 1 one?M
What number has 5 tens and 1 one?G
What number has 2 tens and 4 ones?O
What number has 1 ten and 5 ones?U
What number has 2 tens and 1 one?R
0/15 letters found
Clue 2
Addition
The thief knocked over two crates of spare moon boots. The Star Patrol needs to add the boots from both crates together to find the secret hatch code.
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
97
55
72
70
38
51
T
97
45
38
31
88
35
72
45
72
29
88
72
58
33
50
71
31
72
56
T
97
50
40 + 57 =T
33 + 39 =E
18 + 17 =W
48 + 22 =C
21 + 24 =R
54 + 34 =S
30 + 41 =A
22 + 11 =B
13 + 18 =L
16 + 22 =O
20 + 31 =N
16 + 34 =Y
34 + 24 =D
24 + 32 =F
17 + 38 =H
9 + 20 =U
0/16 letters found
Clue 3
Subtraction
The power core is draining fast! We need to subtract the lost energy units from the starting total to see how much emergency power we have left.
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
60
21
66
67
37
73
73
17
37
14
26
17
14
17
11
17
51
15
26
45
53
17
53
17
23
14
66
T
60
87 - 27 =T
105 - 38 =V
85 - 40 =O
59 - 38 =H
31 - 14 =A
82 - 29 =M
14 - 3 =W
51 - 14 =I
48 - 22 =R
63 - 40 =G
25 - 10 =F
51 - 37 =N
109 - 36 =L
103 - 37 =E
66 - 15 =Y
0/15 letters found
Clue 4
Skip counting
A trail of glowing green alien footprints stretches down the hallway. We have to count them by fives to follow the path safely.
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
130
55
28
12
120
65
20
42
26
50
70
42
65
20
12
28
90
27
120
55
60
42
9
70
Skip-count by 10s. Fill the blank: 10, 20, 30, 40, 50, 60, 70, 80, 90, 100, 110, 120, ___, 140, 150W
Skip-count by 5s. Fill the blank: 5, 10, 15, 20, 25, 30, 35, 40, 45, 50, 55, ___, 65, 70H
Skip-count by 2s. Fill the blank: 2, 4, 6, 8, 10, 12, 14, 16, 18, ___, 22, 24D
Skip-count by 3s. Fill the blank: 3, 6, ___, 12, 15I
Skip-count by 10s. Fill the blank: 10, 20, 30, 40, 50, 60, 70, 80, 90, 100, 110, ___, 130, 140U
Skip-count by 5s. Fill the blank: 5, 10, 15, 20, 25, 30, 35, 40, 45, 50, ___, 60, 65E
Skip-count by 5s. Fill the blank: 5, 10, 15, 20, 25, 30, 35, 40, 45, ___, 55, 60T
Skip-count by 3s. Fill the blank: 3, 6, 9, 12, 15, 18, 21, 24, ___, 30, 33L
Skip-count by 5s. Fill the blank: 5, 10, 15, 20, 25, 30, 35, 40, 45, 50, 55, 60, ___, 70, 75N
Skip-count by 5s. Fill the blank: 5, 10, 15, 20, 25, 30, 35, 40, 45, 50, 55, 60, 65, ___, 75, 80R
Skip-count by 3s. Fill the blank: 3, 6, 9, ___, 15, 18O
Skip-count by 10s. Fill the blank: 10, 20, 30, 40, 50, 60, 70, 80, ___, 100, 110B
Skip-count by 2s. Fill the blank: 2, 4, 6, 8, 10, 12, 14, 16, 18, 20, 22, 24, ___, 28, 30S
Skip-count by 3s. Fill the blank: 3, 6, 9, 12, 15, 18, 21, 24, 27, 30, 33, 36, 39, ___, 45, 48A
Skip-count by 2s. Fill the blank: 2, 4, 6, 8, 10, 12, 14, 16, 18, 20, 22, 24, 26, ___, 30, 32F
0/15 letters found
Clue 5
Missing addends — the last clue
The spaceship's oxygen tank is only partly full. We know the total we need, so we must figure out how many more liters are missing to fill it up.
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
6 + ___ = 10
8 + ___ = 16
7 + ___ = 9
3 + ___ = 14
5 + ___ = 8
10 + ___ = 15
8 + ___ = 20
10 + ___ = 11
4 + ___ = 14
3 + ___ = 12
5 + ___ = 11
Step 2 — cross out the sentence with each answer
1.The villain floated past the space station, then shattered the glass with a sonic boom.
2.The villain turned on a giant force field, then escaped with a quick warp dash.
3.The villain turned on a giant force field, then shattered the glass with a sonic boom.
4.The villain became invisible near the moon, then shattered the glass with a sonic boom.
5.The villain turned on a giant force field, then used magnetic grip to steal the tools.
6.The villain floated past the space station, then lifted a heavy rocket booster with pure mech power.
7.The villain zoomed around on a jetpack, then escaped with a quick warp dash.
8.The villain became invisible near the moon, then froze the control panel with an ice ray.
9.The villain shot lasers at the satellite, then shattered the glass with a sonic boom.
10.The villain shot lasers at the satellite, then lifted a heavy rocket booster with pure mech power.
11.The villain turned on a giant force field, then lifted a heavy rocket booster with pure mech power.
12.The villain zoomed around on a jetpack, then used magnetic grip to steal the tools.
Solve it
Name the culprit
Choose the one suspect left standing.
Answer Key — The Astro Base Heist
Culprit: Neil (rocket flight · warp dash · left handed · blue hair · strong magnets)
- Clue 1 (Place value): "THE SUSPECT DOES NOT USE MAGNETIC GRIP"What number has 7 tens and 7 ones? = 77 (T) · What number has 2 tens and 9 ones? = 29 (A) · What number has 3 tens and 6 ones? = 36 (N) · What number has 4 tens and 2 ones? = 42 (C) · What number has 6 tens and 4 ones? = 64 (S) · What number has 8 tens and 7 ones? = 87 (D) · What number has 7 tens and 9 ones? = 79 (I) · What number has 4 tens and 5 ones? = 45 (H) · What number has 3 tens and 9 ones? = 39 (E) · What number has 8 tens and 2 ones? = 82 (P) · What number has 1 ten and 1 one? = 11 (M) · What number has 5 tens and 1 one? = 51 (G) · What number has 2 tens and 4 ones? = 24 (O) · What number has 1 ten and 5 ones? = 15 (U) · What number has 2 tens and 1 one? = 21 (R)
- Clue 2 (Addition): "THE CONTROLS WERE USED BY A LEFTY"40 + 57 = 97 (T) · 33 + 39 = 72 (E) · 18 + 17 = 35 (W) · 48 + 22 = 70 (C) · 21 + 24 = 45 (R) · 54 + 34 = 88 (S) · 30 + 41 = 71 (A) · 22 + 11 = 33 (B) · 13 + 18 = 31 (L) · 16 + 22 = 38 (O) · 20 + 31 = 51 (N) · 16 + 34 = 50 (Y) · 34 + 24 = 58 (D) · 24 + 32 = 56 (F) · 17 + 38 = 55 (H) · 9 + 20 = 29 (U)
- Clue 3 (Subtraction): "THE VILLAIN RAN AWAY FROM A MAGNET"87 - 27 = 60 (T) · 105 - 38 = 67 (V) · 85 - 40 = 45 (O) · 59 - 38 = 21 (H) · 31 - 14 = 17 (A) · 82 - 29 = 53 (M) · 14 - 3 = 11 (W) · 51 - 14 = 37 (I) · 48 - 22 = 26 (R) · 63 - 40 = 23 (G) · 25 - 10 = 15 (F) · 51 - 37 = 14 (N) · 109 - 36 = 73 (L) · 103 - 37 = 66 (E) · 66 - 15 = 51 (Y)
- Clue 4 (Skip counting): "WE FOUND A STRAND OF BLUE HAIR"Skip-count by 10s. Fill the blank: 10, 20, 30, 40, 50, 60, 70, 80, 90, 100, 110, 120, ___, 140, 150 = 130 (W) · Skip-count by 5s. Fill the blank: 5, 10, 15, 20, 25, 30, 35, 40, 45, 50, 55, ___, 65, 70 = 60 (H) · Skip-count by 2s. Fill the blank: 2, 4, 6, 8, 10, 12, 14, 16, 18, ___, 22, 24 = 20 (D) · Skip-count by 3s. Fill the blank: 3, 6, ___, 12, 15 = 9 (I) · Skip-count by 10s. Fill the blank: 10, 20, 30, 40, 50, 60, 70, 80, 90, 100, 110, ___, 130, 140 = 120 (U) · Skip-count by 5s. Fill the blank: 5, 10, 15, 20, 25, 30, 35, 40, 45, 50, ___, 60, 65 = 55 (E) · Skip-count by 5s. Fill the blank: 5, 10, 15, 20, 25, 30, 35, 40, 45, ___, 55, 60 = 50 (T) · Skip-count by 3s. Fill the blank: 3, 6, 9, 12, 15, 18, 21, 24, ___, 30, 33 = 27 (L) · Skip-count by 5s. Fill the blank: 5, 10, 15, 20, 25, 30, 35, 40, 45, 50, 55, 60, ___, 70, 75 = 65 (N) · Skip-count by 5s. Fill the blank: 5, 10, 15, 20, 25, 30, 35, 40, 45, 50, 55, 60, 65, ___, 75, 80 = 70 (R) · Skip-count by 3s. Fill the blank: 3, 6, 9, ___, 15, 18 = 12 (O) · Skip-count by 10s. Fill the blank: 10, 20, 30, 40, 50, 60, 70, 80, ___, 100, 110 = 90 (B) · Skip-count by 2s. Fill the blank: 2, 4, 6, 8, 10, 12, 14, 16, 18, 20, 22, 24, ___, 28, 30 = 26 (S) · Skip-count by 3s. Fill the blank: 3, 6, 9, 12, 15, 18, 21, 24, 27, 30, 33, 36, 39, ___, 45, 48 = 42 (A) · Skip-count by 2s. Fill the blank: 2, 4, 6, 8, 10, 12, 14, 16, 18, 20, 22, 24, 26, ___, 30, 32 = 28 (F)
- Clue 5 (Missing addends): surviving statement (box 7) → Neil6 + ___ = 10 = 4 · 8 + ___ = 16 = 8 · 7 + ___ = 9 = 2 · 3 + ___ = 14 = 11 · 5 + ___ = 8 = 3 · 10 + ___ = 15 = 5 · 8 + ___ = 20 = 12 · 10 + ___ = 11 = 1 · 4 + ___ = 14 = 10 · 3 + ___ = 12 = 9 · 5 + ___ = 11 = 6
About this mystery
- Grade level
- Grade 2 math
- Math topics
- Place value, Addition, Subtraction, Skip counting, Missing addends
- Reading level
- grades 3-4
- Theme
- The Astro Base Heist — set in Astro Base Alpha
- Format
- Interactive online & printable worksheet with answer key
- Solution
- One unique, verified culprit among 21 suspects