🚀 SpaceGrade 1Reading: grades 1-2AdditionSubtractionSkip countingPlace valueMissing addends
The Mystery of the Starlight Moon Base
Someone snuck into the Starlight Moon Base dome and took the master energy Crystal! Cadet Nova from the Starlight Patrol is on the case. Solve the math clues to cross off suspects and catch the sneaky Space Bandit!
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 | Main Tool | Extra Gear | Dominant Hand | Hair Style | Weakness |
|---|---|---|---|---|---|
| Yuri | Robot Arm | Moon Rover | Left Handed | Neon Blue Hair | Scared Of Space Worms |
| Tim | Gravity Boots | Cosmic Shield | Right Handed | Neon Blue Hair | Magnet Trap |
| Valentina | Jet Pack | Star Map | Left Handed | Neon Blue Hair | Magnet Trap |
| Guion | Space Scooter | Solar Scanner | Left Handed | Neon Blue Hair | Stardust Sneezes |
| Ellen | Laser Torch | Star Map | Left Handed | Neon Blue Hair | Scared Of Space Worms |
| Buzz | Robot Arm | Star Map | Left Handed | Neon Blue Hair | Scared Of Space Worms |
| Kalpana | Gravity Boots | Cosmic Shield | Left Handed | Spiky Purple Hair | Scared Of Space Worms |
| Sally | Jet Pack | Star Map | Right Handed | Neon Blue Hair | Scared Of Space Worms |
| Samantha | Jet Pack | Star Map | Left Handed | Neon Blue Hair | Scared Of Space Worms |
| Anousheh | Laser Torch | Comet Beacon | Left Handed | Spiky Purple Hair | Magnet Trap |
| Sultan | Jet Pack | Cosmic Shield | Left Handed | Silver Astro Cut | Magnet Trap |
| Bernard | Laser Torch | Star Map | Right Handed | Spiky Purple Hair | Stardust Sneezes |
| Christina | Space Scooter | Solar Scanner | Right Handed | Spiky Purple Hair | Stardust Sneezes |
| Victor | Gravity Boots | Comet Beacon | Left Handed | Silver Astro Cut | Scared Of Space Worms |
| Jessica | Laser Torch | Moon Rover | Right Handed | Silver Astro Cut | Magnet Trap |
| Mae | Robot Arm | Solar Scanner | Right Handed | Spiky Purple Hair | Scared Of Space Worms |
| Aki | Laser Torch | Star Map | Right Handed | Silver Astro Cut | Scared Of Space Worms |
| Leland | Jet Pack | Comet Beacon | Left Handed | Spiky Purple Hair | Stardust Sneezes |
| Chris | Jet Pack | Comet Beacon | Left Handed | Neon Blue Hair | Stardust Sneezes |
| Sunita | Laser Torch | Comet Beacon | Left Handed | Neon Blue Hair | Scared Of Space Worms |
| Serena | Robot Arm | Moon Rover | Right Handed | Spiky Purple Hair | Scared Of Space Worms |
Clue 1
Addition
Cadet Nova counted stars on two screens to add up the total power.
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
3
15
13
18
5
7
7
8
5
19
20
17
13
4
19
17
T
3
15
8
18
13
8
2
17
17
19
9
17
18
13
9
2 + 1 =T
10 + 5 =H
5 + 2 =L
1 + 4 =I
8 + 5 =E
3 + 1 =S
10 + 9 =N
11 + 6 =O
6 + 14 =D
5 + 4 =R
2 + 6 =A
7 + 11 =V
1 + 1 =M
0/13 letters found
Clue 2
Subtraction
The team checked the supply chest to see how many glow badges were taken away.
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
16
12
5
2
14
2
10
5
15
T
16
9
5
17
T
16
19
9
5
17
T
16
12
19
4
3
10
8
18
4
T
16
13
4
1
9
19
2
2
19 - 3 =T
12 - 2 =P
3 - 2 =G
13 - 8 =E
14 - 2 =H
18 - 1 =F
6 - 4 =S
11 - 8 =D
20 - 1 =A
11 - 7 =N
20 - 2 =I
13 - 4 =L
18 - 5 =O
20 - 5 =C
15 - 1 =U
11 - 3 =R
0/16 letters found
Clue 3
Skip counting
Nova counted rocket boots by twos along the moon station hall.
Solve each problem to learn its letter. Then write that letter in every box that shows the same number, and read the secret clue.
A
140
28
27
33
8
130
8
28
A
140
26
42
40
10
120
21
8
26
A
140
120
42
20
90
130
42
100
22
27
27
A
140
22
45
A
140
40
A
140
55
Skip-count by 10s. Fill the blank: 10, 20, 30, 40, 50, 60, 70, 80, 90, 100, 110, 120, 130, ___, 150, 160A
Skip-count by 2s. Fill the blank: 2, 4, 6, 8, 10, 12, 14, 16, 18, 20, 22, 24, ___, 28, 30C
Skip-count by 3s. Fill the blank: 3, 6, 9, 12, 15, 18, 21, 24, 27, 30, ___, 36, 39U
Skip-count by 10s. Fill the blank: 10, 20, 30, 40, 50, 60, 70, 80, ___, 100, 110T
Skip-count by 10s. Fill the blank: 10, 20, 30, 40, 50, 60, 70, 80, 90, 100, 110, ___, 130, 140R
Skip-count by 10s. Fill the blank: 10, 20, 30, 40, 50, 60, 70, 80, 90, 100, 110, 120, ___, 140, 150H
Skip-count by 2s. Fill the blank: 2, 4, 6, 8, 10, 12, 14, 16, 18, 20, ___, 24, 26I
Skip-count by 2s. Fill the blank: 2, 4, 6, 8, ___, 12, 14O
Skip-count by 2s. Fill the blank: 2, 4, 6, 8, 10, 12, 14, 16, 18, 20, 22, 24, 26, ___, 30, 32P
Skip-count by 3s. Fill the blank: 3, 6, 9, 12, 15, 18, 21, 24, 27, 30, 33, 36, 39, ___, 45, 48E
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, ___, 60, 65Y
Skip-count by 5s. Fill the blank: 5, 10, 15, 20, 25, 30, 35, 40, ___, 50, 55N
Skip-count by 10s. Fill the blank: 10, 20, 30, 40, 50, 60, 70, 80, 90, ___, 110, 120V
Skip-count by 2s. Fill the blank: 2, 4, 6, ___, 10, 12S
Skip-count by 10s. Fill the blank: 10, 20, 30, ___, 50, 60W
Skip-count by 5s. Fill the blank: 5, 10, 15, ___, 25, 30D
Skip-count by 3s. Fill the blank: 3, 6, 9, 12, 15, 18, ___, 24, 27M
0/18 letters found
Clue 4
Place value
The rover screen shows tens and ones to unlock the mystery signal.
Solve each problem to learn its letter. Then write that letter in every box that shows the same number, and read the secret clue.
A
79
97
84
39
97
91
94
40
84
76
A
79
31
82
19
73
82
A
79
97
32
66
A
79
19
39
97
73
76
84
19
84
A
79
73
What number has 7 tens and 9 ones?A
What number has 7 tens and 3 ones?T
What number has 8 tens and 4 ones?E
What number has 9 tens and 4 ones?L
What number has 4 tens and 0 ones?U
What number has 7 tens and 6 ones?H
What number has 3 tens and 9 ones?O
What number has 6 tens and 6 ones?W
What number has 9 tens and 1 one?B
What number has 3 tens and 2 ones?D
What number has 8 tens and 2 ones?R
What number has 3 tens and 1 one?I
What number has 1 ten and 9 ones?S
What number has 9 tens and 7 ones?N
0/14 letters found
Clue 5
Missing addends — the last clue
Nova found a launch panel with a missing energy number to fill in.
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 + ___ = 16
3 + ___ = 10
5 + ___ = 11
4 + ___ = 15
7 + ___ = 9
7 + ___ = 8
10 + ___ = 22
8 + ___ = 11
4 + ___ = 9
2 + ___ = 6
1 + ___ = 9
Step 2 — cross out the sentence with each answer
1.The villain zipped down the space corridor, then turned on the comet beacon signal.
2.The villain zipped down the space corridor, then drove off across the dark craters.
3.The villain grabbed the glowing crystal, then scanned the room with a solar beam.
4.The villain grabbed the glowing crystal, then turned on the comet beacon signal.
5.The villain stomped across the moon dust, then scanned the room with a solar beam.
6.The villain blasted through the vault lock, then turned on the comet beacon signal.
7.The villain blasted through the vault lock, then checked the star map for a route.
8.The villain flew up to the ceiling hatch, then raised the cosmic shield to block lasers.
9.The villain flew up to the ceiling hatch, then checked the star map for a route.
10.The villain grabbed the glowing crystal, then checked the star map for a route.
11.The villain flew up to the ceiling hatch, then turned on the comet beacon signal.
12.The villain stomped across the moon dust, then raised the cosmic shield to block lasers.
Solve it
Name the culprit
Choose the one suspect left standing.
Answer Key — The Mystery of the Starlight Moon Base
Culprit: Buzz (Robot Arm · Star Map · Left Handed · Neon Blue Hair · Scared Of Space Worms)
- Clue 1 (Addition): "THE VILLAIN DOES NOT HAVE A MOON ROVER"2 + 1 = 3 (T) · 10 + 5 = 15 (H) · 5 + 2 = 7 (L) · 1 + 4 = 5 (I) · 8 + 5 = 13 (E) · 3 + 1 = 4 (S) · 10 + 9 = 19 (N) · 11 + 6 = 17 (O) · 6 + 14 = 20 (D) · 5 + 4 = 9 (R) · 2 + 6 = 8 (A) · 7 + 11 = 18 (V) · 1 + 1 = 2 (M)
- Clue 2 (Subtraction): "THE SUSPECT LEFT A LEFT HAND PRINT ON GLASS"19 - 3 = 16 (T) · 12 - 2 = 10 (P) · 3 - 2 = 1 (G) · 13 - 8 = 5 (E) · 14 - 2 = 12 (H) · 18 - 1 = 17 (F) · 6 - 4 = 2 (S) · 11 - 8 = 3 (D) · 20 - 1 = 19 (A) · 11 - 7 = 4 (N) · 20 - 2 = 18 (I) · 13 - 4 = 9 (L) · 18 - 5 = 13 (O) · 20 - 5 = 15 (C) · 15 - 1 = 14 (U) · 11 - 3 = 8 (R)
- Clue 3 (Skip counting): "A PLUSH SPACE WORM SCARED THE VILLAIN AWAY"Skip-count by 10s. Fill the blank: 10, 20, 30, 40, 50, 60, 70, 80, 90, 100, 110, 120, 130, ___, 150, 160 = 140 (A) · Skip-count by 2s. Fill the blank: 2, 4, 6, 8, 10, 12, 14, 16, 18, 20, 22, 24, ___, 28, 30 = 26 (C) · Skip-count by 3s. Fill the blank: 3, 6, 9, 12, 15, 18, 21, 24, 27, 30, ___, 36, 39 = 33 (U) · Skip-count by 10s. Fill the blank: 10, 20, 30, 40, 50, 60, 70, 80, ___, 100, 110 = 90 (T) · Skip-count by 10s. Fill the blank: 10, 20, 30, 40, 50, 60, 70, 80, 90, 100, 110, ___, 130, 140 = 120 (R) · Skip-count by 10s. Fill the blank: 10, 20, 30, 40, 50, 60, 70, 80, 90, 100, 110, 120, ___, 140, 150 = 130 (H) · Skip-count by 2s. Fill the blank: 2, 4, 6, 8, 10, 12, 14, 16, 18, 20, ___, 24, 26 = 22 (I) · Skip-count by 2s. Fill the blank: 2, 4, 6, 8, ___, 12, 14 = 10 (O) · Skip-count by 2s. Fill the blank: 2, 4, 6, 8, 10, 12, 14, 16, 18, 20, 22, 24, 26, ___, 30, 32 = 28 (P) · Skip-count by 3s. Fill the blank: 3, 6, 9, 12, 15, 18, 21, 24, 27, 30, 33, 36, 39, ___, 45, 48 = 42 (E) · 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, ___, 60, 65 = 55 (Y) · Skip-count by 5s. Fill the blank: 5, 10, 15, 20, 25, 30, 35, 40, ___, 50, 55 = 45 (N) · Skip-count by 10s. Fill the blank: 10, 20, 30, 40, 50, 60, 70, 80, 90, ___, 110, 120 = 100 (V) · Skip-count by 2s. Fill the blank: 2, 4, 6, ___, 10, 12 = 8 (S) · Skip-count by 10s. Fill the blank: 10, 20, 30, ___, 50, 60 = 40 (W) · Skip-count by 5s. Fill the blank: 5, 10, 15, ___, 25, 30 = 20 (D) · Skip-count by 3s. Fill the blank: 3, 6, 9, 12, 15, 18, ___, 24, 27 = 21 (M)
- Clue 4 (Place value): "A NEON BLUE HAIR STRAND WAS ON THE SEAT"What number has 7 tens and 9 ones? = 79 (A) · What number has 7 tens and 3 ones? = 73 (T) · What number has 8 tens and 4 ones? = 84 (E) · What number has 9 tens and 4 ones? = 94 (L) · What number has 4 tens and 0 ones? = 40 (U) · What number has 7 tens and 6 ones? = 76 (H) · What number has 3 tens and 9 ones? = 39 (O) · What number has 6 tens and 6 ones? = 66 (W) · What number has 9 tens and 1 one? = 91 (B) · What number has 3 tens and 2 ones? = 32 (D) · What number has 8 tens and 2 ones? = 82 (R) · What number has 3 tens and 1 one? = 31 (I) · What number has 1 ten and 9 ones? = 19 (S) · What number has 9 tens and 7 ones? = 97 (N)
- Clue 5 (Missing addends): surviving statement (box 10) → Buzz7 + ___ = 16 = 9 · 3 + ___ = 10 = 7 · 5 + ___ = 11 = 6 · 4 + ___ = 15 = 11 · 7 + ___ = 9 = 2 · 7 + ___ = 8 = 1 · 10 + ___ = 22 = 12 · 8 + ___ = 11 = 3 · 4 + ___ = 9 = 5 · 2 + ___ = 6 = 4 · 1 + ___ = 9 = 8
About this mystery
- Grade level
- Grade 1 math
- Math topics
- Addition, Subtraction, Skip counting, Place value, Missing addends
- Reading level
- grades 1-2
- Theme
- The Mystery of the Starlight Moon Base — set in Starlight Moon Base
- Format
- Interactive online & printable worksheet with answer key
- Solution
- One unique, verified culprit among 21 suspects