🚀 SpaceGrade 1Reading: grades 1-2AdditionSubtractionSkip countingPlace valueMissing addends
The Astro-Base Adventure
Oh no! A sneaky space-thief took the Golden Star-Map from Astro-Base Alpha. The Chief Astronomer needs your help to find them before they rocket away!
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 | Jetpack Type | Space Tool | Waving Hand | Spacesuit Hair | Space Allergy |
|---|---|---|---|---|---|
| Barbie | gravity zip | meteor net | right waving | shiny silver hair | cosmic dust |
| Christina | solar wing | moon drill | right waving | shiny silver hair | cosmic dust |
| Yuri | gravity zip | cosmic key | right waving | shiny silver hair | cosmic dust |
| Buzz | turbo boost | moon drill | left waving | shiny silver hair | cosmic dust |
| Luna | turbo boost | star scoop | left waving | shiny silver hair | cosmic dust |
| Sally | gravity zip | laser wrench | right waving | bright green hair | space bubbles |
| Guion | turbo boost | star scoop | right waving | shiny silver hair | cosmic dust |
| Nova | gravity zip | star scoop | right waving | shiny silver hair | cosmic dust |
| Suni | solar wing | star scoop | right waving | neon blue hair | cosmic dust |
| Zack | bubble float | laser wrench | right waving | bright green hair | space bubbles |
| Anne | solar wing | moon drill | right waving | shiny silver hair | space bubbles |
| John | gravity zip | moon drill | right waving | shiny silver hair | moon cheese |
| Ellen | gravity zip | laser wrench | right waving | shiny silver hair | space bubbles |
| Valentina | plasma glide | laser wrench | left waving | bright green hair | cosmic dust |
| Chris | bubble float | laser wrench | left waving | shiny silver hair | space bubbles |
| Jessica | gravity zip | star scoop | right waving | bright green hair | cosmic dust |
| Orion | turbo boost | laser wrench | right waving | neon blue hair | space bubbles |
| Neil | plasma glide | moon drill | right waving | neon blue hair | space bubbles |
| Alex | plasma glide | moon drill | right waving | shiny silver hair | moon cheese |
| Victor | solar wing | star scoop | right waving | bright green hair | space bubbles |
| Peggy | plasma glide | moon drill | right waving | bright green hair | cosmic dust |
Clue 1
Addition
We count the space-packs in the room. Let us add the big packs and small packs together.
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
12
9
8
T
12
9
5
8
10
4
11
8
20
6
11
T
12
9
2
3
8
2
18
8
T
12
8
11
17
6
8
T
12
3 + 9 =T
8 + 9 =R
1 + 1 =A
5 + 4 =H
9 + 9 =M
1 + 4 =I
3 + 1 =D
2 + 4 =N
13 + 7 =S
6 + 5 =O
4 + 6 =F
2 + 6 =E
1 + 2 =V
0/13 letters found
Clue 2
Subtraction
Some star-rocks are missing from our bag. Subtract the ones we have left 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
9
19
2
18
13
18
6
2
11
T
9
16
5
15
2
18
16
14
T
9
19
T
9
19
2
14
4
4
14
10
19
T
9
19
5
8
12
14 - 5 =T
20 - 1 =H
8 - 3 =A
20 - 4 =W
3 - 1 =E
11 - 7 =R
17 - 3 =I
17 - 2 =V
15 - 2 =U
15 - 3 =D
12 - 2 =G
17 - 9 =N
19 - 1 =S
16 - 5 =C
12 - 6 =P
0/15 letters found
Clue 3
Skip counting
The rocket-toys are lined up in groups of five. Let us skip count 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
65
24
8
80
26
12
12
6
26
42
9
42
8
8
10
8
9
42
8
6
110
15
16
9
21
26
15
55
130
9
T
65
Skip-count by 5s. Fill the blank: 5, 10, 15, 20, 25, 30, 35, 40, 45, 50, 55, 60, ___, 70, 75T
Skip-count by 2s. Fill the blank: 2, 4, 6, 8, ___, 12, 14Z
Skip-count by 3s. Fill the blank: 3, 6, 9, 12, 15, 18, ___, 24, 27M
Skip-count by 2s. Fill the blank: 2, 4, ___, 8, 10A
Skip-count by 10s. Fill the blank: 10, 20, 30, 40, 50, 60, 70, 80, 90, 100, ___, 120, 130R
Skip-count by 2s. Fill the blank: 2, 4, 6, ___, 10, 12E
Skip-count by 2s. Fill the blank: 2, 4, 6, 8, 10, 12, 14, 16, 18, 20, 22, 24, ___, 28, 30I
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 10s. Fill the blank: 10, 20, 30, 40, 50, 60, 70, 80, 90, 100, 110, 120, ___, 140, 150U
Skip-count by 10s. Fill the blank: 10, 20, 30, 40, 50, 60, 70, ___, 90, 100V
Skip-count by 5s. Fill the blank: 5, 10, 15, 20, 25, 30, 35, 40, 45, 50, ___, 60, 65D
Skip-count by 3s. Fill the blank: 3, 6, 9, 12, ___, 18, 21C
Skip-count by 3s. Fill the blank: 3, 6, 9, 12, 15, 18, 21, ___, 27, 30H
Skip-count by 2s. Fill the blank: 2, 4, 6, 8, 10, ___, 14, 16L
Skip-count by 3s. Fill the blank: 3, 6, ___, 12, 15S
Skip-count by 2s. Fill the blank: 2, 4, 6, 8, 10, 12, 14, ___, 18, 20O
0/16 letters found
Clue 4
Place value
The radar screen shows a secret code. Read the tens and ones to find the number.
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
79
71
92
98
18
35
84
70
64
53
35
88
70
53
80
76
71
63
64
89
53
63
53
35
78
64
71
70
64
53
19
What number has 7 tens and 9 ones?W
What number has 9 tens and 8 ones?O
What number has 1 ten and 9 ones?P
What number has 7 tens and 8 ones?T
What number has 7 tens and 0 ones?S
What number has 8 tens and 9 ones?A
What number has 5 tens and 3 ones?I
What number has 6 tens and 4 ones?H
What number has 8 tens and 8 ones?Y
What number has 1 ten and 8 ones?U
What number has 7 tens and 6 ones?V
What number has 9 tens and 2 ones?F
What number has 6 tens and 3 ones?R
What number has 3 tens and 5 ones?N
What number has 8 tens and 4 ones?D
What number has 7 tens and 1 one?E
What number has 8 tens and 0 ones?L
0/17 letters found
Clue 5
Missing addends — the last clue
We need ten moon-boots for the crew. We only have six boots. How many more do we need?
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
5 + ___ = 7
6 + ___ = 17
10 + ___ = 15
8 + ___ = 12
10 + ___ = 16
10 + ___ = 18
4 + ___ = 5
6 + ___ = 13
10 + ___ = 19
9 + ___ = 12
1 + ___ = 11
Step 2 — cross out the sentence with each answer
1.The villain glides on a plasma glide, then digs paths with a moon drill.
2.The villain zooms with a solar wing, then digs paths with a moon drill.
3.The villain glides on a plasma glide, then unlocks safes with a cosmic key.
4.The villain glides on a plasma glide, then scoops clues with a star scoop.
5.The villain speeds up with a turbo boost, then scoops clues with a star scoop.
6.The villain speeds up with a turbo boost, then opens doors with a laser wrench.
7.The villain floats with a bubble float, then unlocks safes with a cosmic key.
8.The villain speeds up with a turbo boost, then unlocks safes with a cosmic key.
9.The villain zooms with a solar wing, then opens doors with a laser wrench.
10.The villain floats with a bubble float, then opens doors with a laser wrench.
11.The villain zips along with a gravity zip, then unlocks safes with a cosmic key.
12.The villain zips along with a gravity zip, then scoops clues with a star scoop.
Solve it
Name the culprit
Choose the one suspect left standing.
Answer Key — The Astro-Base Adventure
Culprit: Nova (gravity zip · star scoop · right waving · shiny silver hair · cosmic dust)
- Clue 1 (Addition): "THE THIEF DOES NOT HAVE A METEOR NET"3 + 9 = 12 (T) · 8 + 9 = 17 (R) · 1 + 1 = 2 (A) · 5 + 4 = 9 (H) · 9 + 9 = 18 (M) · 1 + 4 = 5 (I) · 3 + 1 = 4 (D) · 2 + 4 = 6 (N) · 13 + 7 = 20 (S) · 6 + 5 = 11 (O) · 4 + 6 = 10 (F) · 2 + 6 = 8 (E) · 1 + 2 = 3 (V)
- Clue 2 (Subtraction): "THE SUSPECT WAVES WITH THEIR RIGHT HAND"14 - 5 = 9 (T) · 20 - 1 = 19 (H) · 8 - 3 = 5 (A) · 20 - 4 = 16 (W) · 3 - 1 = 2 (E) · 11 - 7 = 4 (R) · 17 - 3 = 14 (I) · 17 - 2 = 15 (V) · 15 - 2 = 13 (U) · 15 - 3 = 12 (D) · 12 - 2 = 10 (G) · 17 - 9 = 8 (N) · 19 - 1 = 18 (S) · 16 - 5 = 11 (C) · 12 - 6 = 6 (P)
- Clue 3 (Skip counting): "THE VILLAIN SNEEZES NEAR COSMIC DUST"Skip-count by 5s. Fill the blank: 5, 10, 15, 20, 25, 30, 35, 40, 45, 50, 55, 60, ___, 70, 75 = 65 (T) · Skip-count by 2s. Fill the blank: 2, 4, 6, 8, ___, 12, 14 = 10 (Z) · Skip-count by 3s. Fill the blank: 3, 6, 9, 12, 15, 18, ___, 24, 27 = 21 (M) · Skip-count by 2s. Fill the blank: 2, 4, ___, 8, 10 = 6 (A) · Skip-count by 10s. Fill the blank: 10, 20, 30, 40, 50, 60, 70, 80, 90, 100, ___, 120, 130 = 110 (R) · Skip-count by 2s. Fill the blank: 2, 4, 6, ___, 10, 12 = 8 (E) · Skip-count by 2s. Fill the blank: 2, 4, 6, 8, 10, 12, 14, 16, 18, 20, 22, 24, ___, 28, 30 = 26 (I) · 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 10s. Fill the blank: 10, 20, 30, 40, 50, 60, 70, 80, 90, 100, 110, 120, ___, 140, 150 = 130 (U) · Skip-count by 10s. Fill the blank: 10, 20, 30, 40, 50, 60, 70, ___, 90, 100 = 80 (V) · Skip-count by 5s. Fill the blank: 5, 10, 15, 20, 25, 30, 35, 40, 45, 50, ___, 60, 65 = 55 (D) · Skip-count by 3s. Fill the blank: 3, 6, 9, 12, ___, 18, 21 = 15 (C) · Skip-count by 3s. Fill the blank: 3, 6, 9, 12, 15, 18, 21, ___, 27, 30 = 24 (H) · Skip-count by 2s. Fill the blank: 2, 4, 6, 8, 10, ___, 14, 16 = 12 (L) · Skip-count by 3s. Fill the blank: 3, 6, ___, 12, 15 = 9 (S) · Skip-count by 2s. Fill the blank: 2, 4, 6, 8, 10, 12, 14, ___, 18, 20 = 16 (O)
- Clue 4 (Place value): "WE FOUND SHINY SILVER HAIR IN THE SHIP"What number has 7 tens and 9 ones? = 79 (W) · What number has 9 tens and 8 ones? = 98 (O) · What number has 1 ten and 9 ones? = 19 (P) · What number has 7 tens and 8 ones? = 78 (T) · What number has 7 tens and 0 ones? = 70 (S) · What number has 8 tens and 9 ones? = 89 (A) · What number has 5 tens and 3 ones? = 53 (I) · What number has 6 tens and 4 ones? = 64 (H) · What number has 8 tens and 8 ones? = 88 (Y) · What number has 1 ten and 8 ones? = 18 (U) · What number has 7 tens and 6 ones? = 76 (V) · What number has 9 tens and 2 ones? = 92 (F) · What number has 6 tens and 3 ones? = 63 (R) · What number has 3 tens and 5 ones? = 35 (N) · What number has 8 tens and 4 ones? = 84 (D) · What number has 7 tens and 1 one? = 71 (E) · What number has 8 tens and 0 ones? = 80 (L)
- Clue 5 (Missing addends): surviving statement (box 12) → Nova5 + ___ = 7 = 2 · 6 + ___ = 17 = 11 · 10 + ___ = 15 = 5 · 8 + ___ = 12 = 4 · 10 + ___ = 16 = 6 · 10 + ___ = 18 = 8 · 4 + ___ = 5 = 1 · 6 + ___ = 13 = 7 · 10 + ___ = 19 = 9 · 9 + ___ = 12 = 3 · 1 + ___ = 11 = 10
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 Astro-Base Adventure — set in Astro-Base Alpha
- Format
- Interactive online & printable worksheet with answer key
- Solution
- One unique, verified culprit among 21 suspects