🚀 SpaceGrade 1Reading: grades 1-2AdditionSubtractionSkip countingPlace valueMissing addends
The Great Space Crystal Mystery
The shiny Golden Space Crystal is gone! Someone took it from the Star Base dome. We must find the Cosmic Crook before they launch their rocket!
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 | Gadget | Dominant Glove | Hair Color | Weakness |
|---|---|---|---|---|---|
| John | rocket jet pack | star decoder | right handed glove | bright blue hair | heavy magnet trap |
| Victor | zero gravity boots | cosmic camera | right handed glove | comet orange hair | heavy magnet trap |
| Sunita | rocket jet pack | mini radar | right handed glove | shiny silver hair | sticky space gel |
| Tim | rocket jet pack | cosmic camera | right handed glove | bright blue hair | heavy magnet trap |
| Mae | force field shield | mini radar | left handed glove | bright blue hair | bright strobe lights |
| Scott | super magnet belt | gravity lifter | right handed glove | shiny silver hair | bright strobe lights |
| Buzz | rocket jet pack | plasma torch | left handed glove | comet orange hair | sticky space gel |
| Jessica | rocket jet pack | mini radar | right handed glove | comet orange hair | heavy magnet trap |
| Valentina | super magnet belt | cosmic camera | left handed glove | comet orange hair | sticky space gel |
| Sally | force field shield | plasma torch | right handed glove | shiny silver hair | bright strobe lights |
| Christina | rocket jet pack | plasma torch | right handed glove | comet orange hair | sticky space gel |
| Helen | zero gravity boots | plasma torch | left handed glove | comet orange hair | heavy magnet trap |
| Anne | super magnet belt | gravity lifter | left handed glove | comet orange hair | sticky space gel |
| Guion | rocket jet pack | star decoder | right handed glove | comet orange hair | heavy magnet trap |
| Kalpana | zero gravity boots | cosmic camera | left handed glove | comet orange hair | sticky space gel |
| Reid | super magnet belt | mini radar | left handed glove | comet orange hair | sticky space gel |
| Kimiya | super magnet belt | cosmic camera | left handed glove | comet orange hair | heavy magnet trap |
| Woody | laser blaster glove | plasma torch | right handed glove | comet orange hair | bright strobe lights |
| Yuri | super magnet belt | cosmic camera | left handed glove | bright blue hair | sticky space gel |
| Mark | rocket jet pack | gravity lifter | left handed glove | comet orange hair | heavy magnet trap |
| Chris | rocket jet pack | star decoder | right handed glove | comet orange hair | sticky space gel |
Clue 1
Addition
A cadet counts the shiny fuel cans on the rack. We add more cans to get the total. A computer prints a card.
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
15
13
20
19
9
6
4
10
16
14
20
19
18
14
T
15
13
6
5
20
T
15
13
20
10
2
6
19
4
6
T
15
14
7
9
13
11 + 4 =T
5 + 8 =H
7 + 2 =C
9 + 10 =S
2 + 4 =A
12 + 6 =N
2 + 5 =R
12 + 4 =D
2 + 3 =V
14 + 6 =E
5 + 9 =O
3 + 1 =M
1 + 1 =L
5 + 5 =P
0/14 letters found
Clue 2
Subtraction
The space station lost some water packs from the kitchen. We take away the missing packs. A locker pops open.
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
1
6
3
15
13
7
10
2
T
1
16
5
3
10
13
14
3
11
T
1
6
13
7
10
3
10
18
14
12
4
3
5 - 4 =T
17 - 1 =U
11 - 5 =H
7 - 2 =S
9 - 6 =E
19 - 4 =B
18 - 4 =L
20 - 2 =G
5 - 1 =V
18 - 7 =F
16 - 9 =N
4 - 2 =I
17 - 5 =O
19 - 6 =A
14 - 4 =D
0/15 letters found
Clue 3
Skip counting
We count the blinking stars in the sky by twos. This opens the star safe. Inside is a dusty notebook.
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
42
25
140
130
15
50
S
42
110
39
130
60
100
60
36
80
140
36
36
25
55
39
110
25
70
60
25
70
140
60
45
Skip-count by 3s. Fill the blank: 3, 6, 9, 12, 15, 18, 21, 24, 27, 30, 33, 36, 39, ___, 45, 48S
Skip-count by 10s. Fill the blank: 10, 20, 30, 40, 50, 60, 70, 80, 90, ___, 110, 120G
Skip-count by 5s. Fill the blank: 5, 10, 15, 20, 25, 30, 35, 40, 45, 50, 55, ___, 65, 70E
Skip-count by 10s. Fill the blank: 10, 20, 30, 40, 50, 60, 70, 80, 90, 100, 110, 120, 130, ___, 150, 160I
Skip-count by 3s. Fill the blank: 3, 6, 9, 12, 15, 18, 21, 24, 27, 30, 33, 36, ___, 42, 45A
Skip-count by 5s. Fill the blank: 5, 10, 15, 20, 25, 30, 35, 40, ___, 50, 55F
Skip-count by 5s. Fill the blank: 5, 10, ___, 20, 25K
Skip-count by 10s. Fill the blank: 10, 20, 30, 40, 50, 60, 70, 80, 90, 100, ___, 120, 130P
Skip-count by 5s. Fill the blank: 5, 10, 15, 20, 25, 30, 35, 40, 45, 50, ___, 60, 65R
Skip-count by 3s. Fill the blank: 3, 6, 9, 12, 15, 18, 21, 24, 27, 30, 33, ___, 39, 42L
Skip-count by 5s. Fill the blank: 5, 10, 15, 20, 25, 30, 35, 40, 45, 50, 55, 60, 65, ___, 75, 80H
Skip-count by 10s. Fill the blank: 10, 20, 30, 40, 50, 60, 70, ___, 90, 100W
Skip-count by 10s. Fill the blank: 10, 20, 30, 40, ___, 60, 70Y
Skip-count by 10s. Fill the blank: 10, 20, 30, 40, 50, 60, 70, 80, 90, 100, 110, 120, ___, 140, 150C
Skip-count by 5s. Fill the blank: 5, 10, 15, 20, ___, 30, 35T
0/15 letters found
Clue 4
Place value
The big computer screen shows groups of tens and ones. We read the numbers. A secret drawer slides out.
Solve each problem to learn its letter. Then write that letter in every box that shows the same number, and read the secret clue.
C
67
86
41
22
80
86
14
35
31
94
22
64
35
79
14
28
35
55
68
22
45
80
86
31
80
64
22
64
22
68
41
22
80
What number has 6 tens and 7 ones?C
What number has 5 tens and 5 ones?S
What number has 4 tens and 1 one?M
What number has 6 tens and 8 ones?L
What number has 2 tens and 8 ones?W
What number has 4 tens and 5 ones?F
What number has 8 tens and 0 ones?T
What number has 8 tens and 6 ones?O
What number has 2 tens and 2 ones?E
What number has 7 tens and 9 ones?I
What number has 3 tens and 5 ones?A
What number has 1 ten and 4 ones?R
What number has 6 tens and 4 ones?H
What number has 3 tens and 1 one?N
What number has 9 tens and 4 ones?G
0/15 letters found
Clue 5
Missing addends — the last clue
We have six space suits but we need ten. We find how many more we must get. A map drops from the ceiling.
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
8 + ___ = 16
5 + ___ = 10
2 + ___ = 3
10 + ___ = 16
7 + ___ = 16
7 + ___ = 17
10 + ___ = 17
10 + ___ = 21
5 + ___ = 17
10 + ___ = 14
5 + ___ = 7
Step 2 — cross out the sentence with each answer
1.The villain grabs metal keys with a magnet belt, then takes pictures using a cosmic camera.
2.The villain floats away with zero gravity boots, then melts the lock using a plasma torch.
3.The villain grabs metal keys with a magnet belt, then lifts heavy crates with a gravity lifter.
4.The villain blocks guards with a force field, then reads alien codes with a star decoder.
5.The villain grabs metal keys with a magnet belt, then finds the escape hatch with a mini radar.
6.The villain grabs metal keys with a magnet belt, then reads alien codes with a star decoder.
7.The villain blasts a path with a laser glove, then melts the lock using a plasma torch.
8.The villain floats away with zero gravity boots, then takes pictures using a cosmic camera.
9.The villain floats away with zero gravity boots, then finds the escape hatch with a mini radar.
10.The villain flies up using a rocket jet pack, then reads alien codes with a star decoder.
11.The villain flies up using a rocket jet pack, then finds the escape hatch with a mini radar.
12.The villain blocks guards with a force field, then lifts heavy crates with a gravity lifter.
Solve it
Name the culprit
Choose the one suspect left standing.
Answer Key — The Great Space Crystal Mystery
Culprit: Anne (super magnet belt · gravity lifter · left handed glove · comet orange hair · sticky space gel)
- Clue 1 (Addition): "THE SCAMP DOES NOT HAVE THE PLASMA TORCH"11 + 4 = 15 (T) · 5 + 8 = 13 (H) · 7 + 2 = 9 (C) · 9 + 10 = 19 (S) · 2 + 4 = 6 (A) · 12 + 6 = 18 (N) · 2 + 5 = 7 (R) · 12 + 4 = 16 (D) · 2 + 3 = 5 (V) · 14 + 6 = 20 (E) · 5 + 9 = 14 (O) · 3 + 1 = 4 (M) · 1 + 1 = 2 (L) · 5 + 5 = 10 (P)
- Clue 2 (Subtraction): "THE BANDIT USED A LEFT HANDED GLOVE"5 - 4 = 1 (T) · 17 - 1 = 16 (U) · 11 - 5 = 6 (H) · 7 - 2 = 5 (S) · 9 - 6 = 3 (E) · 19 - 4 = 15 (B) · 18 - 4 = 14 (L) · 20 - 2 = 18 (G) · 5 - 1 = 4 (V) · 18 - 7 = 11 (F) · 16 - 9 = 7 (N) · 4 - 2 = 2 (I) · 17 - 5 = 12 (O) · 19 - 6 = 13 (A) · 14 - 4 = 10 (D)
- Clue 3 (Skip counting): "STICKY SPACE GEL WILL TRAP THE THIEF"Skip-count by 3s. Fill the blank: 3, 6, 9, 12, 15, 18, 21, 24, 27, 30, 33, 36, 39, ___, 45, 48 = 42 (S) · Skip-count by 10s. Fill the blank: 10, 20, 30, 40, 50, 60, 70, 80, 90, ___, 110, 120 = 100 (G) · Skip-count by 5s. Fill the blank: 5, 10, 15, 20, 25, 30, 35, 40, 45, 50, 55, ___, 65, 70 = 60 (E) · Skip-count by 10s. Fill the blank: 10, 20, 30, 40, 50, 60, 70, 80, 90, 100, 110, 120, 130, ___, 150, 160 = 140 (I) · Skip-count by 3s. Fill the blank: 3, 6, 9, 12, 15, 18, 21, 24, 27, 30, 33, 36, ___, 42, 45 = 39 (A) · Skip-count by 5s. Fill the blank: 5, 10, 15, 20, 25, 30, 35, 40, ___, 50, 55 = 45 (F) · Skip-count by 5s. Fill the blank: 5, 10, ___, 20, 25 = 15 (K) · Skip-count by 10s. Fill the blank: 10, 20, 30, 40, 50, 60, 70, 80, 90, 100, ___, 120, 130 = 110 (P) · Skip-count by 5s. Fill the blank: 5, 10, 15, 20, 25, 30, 35, 40, 45, 50, ___, 60, 65 = 55 (R) · Skip-count by 3s. Fill the blank: 3, 6, 9, 12, 15, 18, 21, 24, 27, 30, 33, ___, 39, 42 = 36 (L) · Skip-count by 5s. Fill the blank: 5, 10, 15, 20, 25, 30, 35, 40, 45, 50, 55, 60, 65, ___, 75, 80 = 70 (H) · Skip-count by 10s. Fill the blank: 10, 20, 30, 40, 50, 60, 70, ___, 90, 100 = 80 (W) · Skip-count by 10s. Fill the blank: 10, 20, 30, 40, ___, 60, 70 = 50 (Y) · Skip-count by 10s. Fill the blank: 10, 20, 30, 40, 50, 60, 70, 80, 90, 100, 110, 120, ___, 140, 150 = 130 (C) · Skip-count by 5s. Fill the blank: 5, 10, 15, 20, ___, 30, 35 = 25 (T)
- Clue 4 (Place value): "COMET ORANGE HAIR WAS LEFT ON THE HELMET"What number has 6 tens and 7 ones? = 67 (C) · What number has 5 tens and 5 ones? = 55 (S) · What number has 4 tens and 1 one? = 41 (M) · What number has 6 tens and 8 ones? = 68 (L) · What number has 2 tens and 8 ones? = 28 (W) · What number has 4 tens and 5 ones? = 45 (F) · What number has 8 tens and 0 ones? = 80 (T) · What number has 8 tens and 6 ones? = 86 (O) · What number has 2 tens and 2 ones? = 22 (E) · What number has 7 tens and 9 ones? = 79 (I) · What number has 3 tens and 5 ones? = 35 (A) · What number has 1 ten and 4 ones? = 14 (R) · What number has 6 tens and 4 ones? = 64 (H) · What number has 3 tens and 1 one? = 31 (N) · What number has 9 tens and 4 ones? = 94 (G)
- Clue 5 (Missing addends): surviving statement (box 3) → Anne8 + ___ = 16 = 8 · 5 + ___ = 10 = 5 · 2 + ___ = 3 = 1 · 10 + ___ = 16 = 6 · 7 + ___ = 16 = 9 · 7 + ___ = 17 = 10 · 10 + ___ = 17 = 7 · 10 + ___ = 21 = 11 · 5 + ___ = 17 = 12 · 10 + ___ = 14 = 4 · 5 + ___ = 7 = 2
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 Great Space Crystal Mystery — set in the Cosmic Star Base
- Format
- Interactive online & printable worksheet with answer key
- Solution
- One unique, verified culprit among 21 suspects