🚀 SpaceGrade 2Reading: grades 1-2AdditionSubtractionPlace valueSkip countingMissing addends
The Great Moon Dust Mystery
Someone sneaked into the space lab and took the glowing Moon Dust! The Astro-Dome needs your help. Use your math skills and look at the clues to find 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 | Space Power | Special Trick | Hand Print | Hair Color | Weakness |
|---|---|---|---|---|---|
| Neil Strong | cosmic glide | asteroid smash | right handed | glowing orange hair | bubble gum |
| Leo Orbit | cosmic glide | warp speed | left handed | neon green hair | bubble gum |
| Ziggy Mars | laser dash | meteor toss | right handed | bright blue hair | magnet boots |
| Sally Ride | cosmic glide | meteor toss | right handed | neon green hair | magnet boots |
| Comet Cody | cosmic glide | warp speed | left handed | glowing orange hair | loud whistles |
| Cosmo Clay | laser dash | plasma beam | left handed | bright blue hair | loud whistles |
| Astro Art | rocket blast | orbit spin | right handed | neon green hair | bubble gum |
| Nova Bright | star shield | orbit spin | right handed | bright blue hair | loud whistles |
| Orion Rex | star shield | plasma beam | right handed | neon green hair | bubble gum |
| Ray Radar | laser dash | warp speed | left handed | glowing orange hair | bubble gum |
| Major Max | star shield | orbit spin | left handed | bright blue hair | bubble gum |
| Luna Loop | cosmic glide | warp speed | left handed | bright blue hair | bubble gum |
| Commander Kip | laser dash | plasma beam | right handed | glowing orange hair | bubble gum |
| Cadet Coco | gravity jump | orbit spin | right handed | neon green hair | magnet boots |
| Pippa Planet | gravity jump | orbit spin | right handed | neon green hair | bubble gum |
| Buzz Aldrin | cosmic glide | orbit spin | left handed | glowing orange hair | loud whistles |
| Jax Nebula | cosmic glide | warp speed | right handed | neon green hair | magnet boots |
| Stella Sky | gravity jump | warp speed | left handed | glowing orange hair | loud whistles |
| Nova Ned | rocket blast | meteor toss | right handed | neon green hair | loud whistles |
| Penny Proton | gravity jump | warp speed | right handed | neon green hair | bubble gum |
| Zara Pluto | rocket blast | meteor toss | right handed | neon green hair | bubble gum |
Clue 1
Addition
We need to count the star maps. Count the maps on the top shelf and add the maps on the floor to find the 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
41
47
63
82
94
67
33
36
T
41
66
94
67
67
28
T
41
T
41
28
29
29
26
63
T
41
63
28
51
29
17 + 24 =T
23 + 13 =I
17 + 12 =S
21 + 30 =R
41 + 41 =B
17 + 11 =O
47 + 20 =N
15 + 18 =D
15 + 11 =M
56 + 38 =A
19 + 44 =E
15 + 32 =H
24 + 42 =C
0/13 letters found
Clue 2
Subtraction
Look at the fuel tanks. We had ten tanks of rocket juice but some leaked out. Subtract the leaked tanks to get the key.
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
47
53
59
22
50
25
53
T
47
53
66
38
78
25
22
66
83
83
59
78
T
47
53
59
78
26
26
22
14
38
26
83
60 - 13 =T
73 - 23 =I
110 - 32 =D
57 - 19 =N
40 - 26 =K
65 - 6 =E
50 - 24 =O
85 - 32 =H
88 - 22 =A
35 - 13 =R
29 - 4 =G
113 - 30 =B
0/12 letters found
Clue 3
Place value
The computer screen shows numbers. Look at the tens place and the ones place to unlock the next secret.
Solve each problem to learn its letter. Then write that letter in every box that shows the same number, and read the secret clue.
S
29
85
71
63
79
90
48
58
48
48
14
33
36
58
82
S
29
85
68
61
S
29
85
78
33
82
What number has 2 tens and 9 ones?S
What number has 7 tens and 1 one?I
What number has 4 tens and 8 ones?B
What number has 6 tens and 1 one?P
What number has 9 tens and 0 ones?Y
What number has 6 tens and 8 ones?O
What number has 1 ten and 4 ones?L
What number has 7 tens and 9 ones?K
What number has 3 tens and 6 ones?G
What number has 8 tens and 5 ones?T
What number has 6 tens and 3 ones?C
What number has 5 tens and 8 ones?U
What number has 8 tens and 2 ones?M
What number has 7 tens and 8 ones?H
What number has 3 tens and 3 ones?E
0/15 letters found
Clue 4
Skip counting
The space boots left prints on the dusty path. Count the steps by twos to reach the hidden room.
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
9
26
130
27
55
45
18
10
45
26
27
45
6
42
26
26
45
140
10
8
42
Skip-count by 3s. Fill the blank: 3, 6, ___, 12, 15W
Skip-count by 2s. Fill the blank: 2, 4, 6, 8, ___, 12, 14A
Skip-count by 5s. Fill the blank: 5, 10, 15, 20, 25, 30, 35, 40, ___, 50, 55N
Skip-count by 3s. Fill the blank: 3, 6, 9, 12, 15, 18, 21, 24, 27, 30, 33, 36, 39, ___, 45, 48R
Skip-count by 2s. Fill the blank: 2, 4, 6, ___, 10, 12I
Skip-count by 5s. Fill the blank: 5, 10, 15, 20, 25, 30, 35, 40, 45, 50, ___, 60, 65U
Skip-count by 10s. Fill the blank: 10, 20, 30, 40, 50, 60, 70, 80, 90, 100, 110, 120, ___, 140, 150F
Skip-count by 3s. Fill the blank: 3, 6, 9, 12, 15, 18, 21, 24, ___, 30, 33O
Skip-count by 2s. Fill the blank: 2, 4, 6, 8, 10, 12, 14, 16, 18, 20, 22, 24, ___, 28, 30E
Skip-count by 2s. Fill the blank: 2, 4, 6, 8, 10, 12, 14, 16, ___, 20, 22D
Skip-count by 2s. Fill the blank: 2, 4, ___, 8, 10G
Skip-count by 10s. Fill the blank: 10, 20, 30, 40, 50, 60, 70, 80, 90, 100, 110, 120, 130, ___, 150, 160H
0/12 letters found
Clue 5
Missing addends — the last clue
The robot needs eight batteries to turn on, but we only have five. How many more do we need to make eight?
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
9 + ___ = 13
2 + ___ = 10
8 + ___ = 15
6 + ___ = 17
8 + ___ = 20
1 + ___ = 2
1 + ___ = 6
6 + ___ = 12
2 + ___ = 4
8 + ___ = 17
8 + ___ = 11
Step 2 — cross out the sentence with each answer
1.The villain holds up a glowing star shield, then smashes a floating asteroid.
2.The villain makes a fast laser dash, then shoots a bright plasma beam.
3.The villain makes a fast laser dash, then smashes a floating asteroid.
4.The villain fires a giant rocket blast, then does a wild spin in orbit.
5.The villain takes off in a smooth cosmic glide, then tosses a heavy space meteor.
6.The villain makes a fast laser dash, then tosses a heavy space meteor.
7.The villain holds up a glowing star shield, then shoots a bright plasma beam.
8.The villain uses a high gravity jump, then does a wild spin in orbit.
9.The villain takes off in a smooth cosmic glide, then does a wild spin in orbit.
10.The villain uses a high gravity jump, then warps away at super speed.
11.The villain holds up a glowing star shield, then warps away at super speed.
12.The villain takes off in a smooth cosmic glide, then warps away at super speed.
Solve it
Name the culprit
Choose the one suspect left standing.
Answer Key — The Great Moon Dust Mystery
Culprit: Penny Proton (gravity jump · warp speed · right handed · neon green hair · bubble gum)
- Clue 1 (Addition): "THE BANDIT CANNOT TOSS METEORS"17 + 24 = 41 (T) · 23 + 13 = 36 (I) · 17 + 12 = 29 (S) · 21 + 30 = 51 (R) · 41 + 41 = 82 (B) · 17 + 11 = 28 (O) · 47 + 20 = 67 (N) · 15 + 18 = 33 (D) · 15 + 11 = 26 (M) · 56 + 38 = 94 (A) · 19 + 44 = 63 (E) · 15 + 32 = 47 (H) · 24 + 42 = 66 (C)
- Clue 2 (Subtraction): "THE RIGHT HAND GRABBED THE DOORKNOB"60 - 13 = 47 (T) · 73 - 23 = 50 (I) · 110 - 32 = 78 (D) · 57 - 19 = 38 (N) · 40 - 26 = 14 (K) · 65 - 6 = 59 (E) · 50 - 24 = 26 (O) · 85 - 32 = 53 (H) · 88 - 22 = 66 (A) · 35 - 13 = 22 (R) · 29 - 4 = 25 (G) · 113 - 30 = 83 (B)
- Clue 3 (Place value): "STICKY BUBBLE GUM STOPS THEM"What number has 2 tens and 9 ones? = 29 (S) · What number has 7 tens and 1 one? = 71 (I) · What number has 4 tens and 8 ones? = 48 (B) · What number has 6 tens and 1 one? = 61 (P) · What number has 9 tens and 0 ones? = 90 (Y) · What number has 6 tens and 8 ones? = 68 (O) · What number has 1 ten and 4 ones? = 14 (L) · What number has 7 tens and 9 ones? = 79 (K) · What number has 3 tens and 6 ones? = 36 (G) · What number has 8 tens and 5 ones? = 85 (T) · What number has 6 tens and 3 ones? = 63 (C) · What number has 5 tens and 8 ones? = 58 (U) · What number has 8 tens and 2 ones? = 82 (M) · What number has 7 tens and 8 ones? = 78 (H) · What number has 3 tens and 3 ones? = 33 (E)
- Clue 4 (Skip counting): "WE FOUND A NEON GREEN HAIR"Skip-count by 3s. Fill the blank: 3, 6, ___, 12, 15 = 9 (W) · Skip-count by 2s. Fill the blank: 2, 4, 6, 8, ___, 12, 14 = 10 (A) · Skip-count by 5s. Fill the blank: 5, 10, 15, 20, 25, 30, 35, 40, ___, 50, 55 = 45 (N) · Skip-count by 3s. Fill the blank: 3, 6, 9, 12, 15, 18, 21, 24, 27, 30, 33, 36, 39, ___, 45, 48 = 42 (R) · Skip-count by 2s. Fill the blank: 2, 4, 6, ___, 10, 12 = 8 (I) · Skip-count by 5s. Fill the blank: 5, 10, 15, 20, 25, 30, 35, 40, 45, 50, ___, 60, 65 = 55 (U) · Skip-count by 10s. Fill the blank: 10, 20, 30, 40, 50, 60, 70, 80, 90, 100, 110, 120, ___, 140, 150 = 130 (F) · Skip-count by 3s. Fill the blank: 3, 6, 9, 12, 15, 18, 21, 24, ___, 30, 33 = 27 (O) · Skip-count by 2s. Fill the blank: 2, 4, 6, 8, 10, 12, 14, 16, 18, 20, 22, 24, ___, 28, 30 = 26 (E) · Skip-count by 2s. Fill the blank: 2, 4, 6, 8, 10, 12, 14, 16, ___, 20, 22 = 18 (D) · Skip-count by 2s. Fill the blank: 2, 4, ___, 8, 10 = 6 (G) · Skip-count by 10s. Fill the blank: 10, 20, 30, 40, 50, 60, 70, 80, 90, 100, 110, 120, 130, ___, 150, 160 = 140 (H)
- Clue 5 (Missing addends): surviving statement (box 10) → Penny Proton9 + ___ = 13 = 4 · 2 + ___ = 10 = 8 · 8 + ___ = 15 = 7 · 6 + ___ = 17 = 11 · 8 + ___ = 20 = 12 · 1 + ___ = 2 = 1 · 1 + ___ = 6 = 5 · 6 + ___ = 12 = 6 · 2 + ___ = 4 = 2 · 8 + ___ = 17 = 9 · 8 + ___ = 11 = 3
About this mystery
- Grade level
- Grade 2 math
- Math topics
- Addition, Subtraction, Place value, Skip counting, Missing addends
- Reading level
- grades 1-2
- Theme
- The Great Moon Dust Mystery — set in Astro-Dome Alpha
- Format
- Interactive online & printable worksheet with answer key
- Solution
- One unique, verified culprit among 21 suspects