🦄 UnicornsGrade 1Reading: grades 1-2AdditionSubtractionSkip countingPlace valueMissing addends
The Case of the Missing Star Crystal
Someone snatched the glowing Star Crystal from the Sparkle Tree! Detective Pip needs your help to decode the clues and find the sneaky unicorn thief.
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 | Magic Horn Ability | Special Gear | Hoof Mark | Mane Style | Silly Weakness |
|---|---|---|---|---|---|
| Pip | Glitter Blast | Moon Ribbon | Right Hoof Print | Curly Mane | Scared Of Frogs |
| Sunny | Rainbow Beams | Crystal Horseshoe | Right Hoof Print | Spiky Mane | Sneeze From Flowers |
| Willow | Starlight Sparkles | Moon Ribbon | Right Hoof Print | Spiky Mane | Scared Of Frogs |
| Rosie | Glitter Blast | Silver Bell Collar | Right Hoof Print | Curly Mane | Scared Of Frogs |
| Sparky | Starlight Sparkles | Silver Bell Collar | Right Hoof Print | Curly Mane | Scared Of Frogs |
| Barnaby | Flower Sprouting | Silver Bell Collar | Left Hoof Print | Curly Mane | Scared Of Frogs |
| Misty | Starlight Sparkles | Golden Saddle | Right Hoof Print | Curly Mane | Tickled By Bubbles |
| Blossom | Cloud Floating | Star Wand | Right Hoof Print | Curly Mane | Scared Of Frogs |
| Stella | Starlight Sparkles | Crystal Horseshoe | Left Hoof Print | Curly Mane | Tickled By Bubbles |
| Honey | Rainbow Beams | Silver Bell Collar | Right Hoof Print | Spiky Mane | Tickled By Bubbles |
| Buttercup | Starlight Sparkles | Moon Ribbon | Right Hoof Print | Curly Mane | Scared Of Frogs |
| Ziggy | Flower Sprouting | Star Wand | Right Hoof Print | Spiky Mane | Sneeze From Flowers |
| Poppy | Starlight Sparkles | Golden Saddle | Right Hoof Print | Curly Mane | Sneeze From Flowers |
| Milo | Flower Sprouting | Golden Saddle | Left Hoof Print | Curly Mane | Scared Of Frogs |
| Jasper | Glitter Blast | Star Wand | Right Hoof Print | Spiky Mane | Tickled By Bubbles |
| Peanut | Flower Sprouting | Moon Ribbon | Right Hoof Print | Curly Mane | Sneeze From Flowers |
| Comet | Cloud Floating | Golden Saddle | Left Hoof Print | Braided Mane | Tickled By Bubbles |
| Nova | Cloud Floating | Crystal Horseshoe | Right Hoof Print | Braided Mane | Scared Of Frogs |
| Penny | Flower Sprouting | Moon Ribbon | Left Hoof Print | Spiky Mane | Scared Of Frogs |
| Gemma | Glitter Blast | Golden Saddle | Right Hoof Print | Braided Mane | Tickled By Bubbles |
| Twinkle | Rainbow Beams | Crystal Horseshoe | Left Hoof Print | Braided Mane | Sneeze From Flowers |
Clue 1
Addition
Detective Pip counts the glowing berries dropped on the path to see where the suspect went.
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
18
15
19
14
14
5
19
16
4
11
18
2
16
11
T
12
7
18
5
8
5
2
T
12
5
8
7
5
16
4
4 + 8 =T
8 + 10 =E
13 + 6 =I
1 + 1 =S
6 + 2 =R
8 + 3 =O
3 + 1 =D
7 + 2 =H
1 + 4 =A
10 + 5 =V
9 + 7 =N
10 + 4 =L
2 + 5 =W
0/13 letters found
Clue 2
Subtraction
The Meadow Keeper checks how many magic apples are left in the basket after the thief took some.
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
5
7
18
9
4
1
1
1
16
W
5
16
8
7
15
10
18
10
2
2
3
11
8
7
9
18
9
4
16
8
18
10
4
18
8
4
4
6 - 1 =W
13 - 5 =R
16 - 6 =H
20 - 9 =P
19 - 1 =T
10 - 9 =S
17 - 8 =N
17 - 1 =A
10 - 7 =F
11 - 9 =O
19 - 4 =G
12 - 5 =I
7 - 3 =E
0/13 letters found
Clue 3
Skip counting
Detective Pip skip counts the shiny sparkles along the trail by twos to follow the thief.
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
100
26
70
24
10
70
25
45
16
55
140
33
33
25
140
10
39
25
10
25
27
25
16
15
39
18
80
21
39
70
70
10
15
39
18
21
24
Skip-count by 10s. Fill the blank: 10, 20, 30, 40, 50, 60, 70, 80, 90, ___, 110, 120T
Skip-count by 2s. Fill the blank: 2, 4, 6, 8, 10, 12, 14, 16, ___, 20, 22O
Skip-count by 5s. Fill the blank: 5, 10, 15, 20, ___, 30, 35A
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, ___, 18, 21F
Skip-count by 2s. Fill the blank: 2, 4, 6, 8, 10, 12, 14, ___, 18, 20Y
Skip-count by 5s. Fill the blank: 5, 10, 15, 20, 25, 30, 35, 40, ___, 50, 55K
Skip-count by 3s. Fill the blank: 3, 6, 9, 12, 15, 18, 21, ___, 27, 30S
Skip-count by 3s. Fill the blank: 3, 6, 9, 12, 15, 18, 21, 24, 27, 30, 33, 36, ___, 42, 45R
Skip-count by 2s. Fill the blank: 2, 4, 6, 8, ___, 12, 14N
Skip-count by 3s. Fill the blank: 3, 6, 9, 12, 15, 18, 21, 24, ___, 30, 33W
Skip-count by 5s. Fill the blank: 5, 10, 15, 20, 25, 30, 35, 40, 45, 50, ___, 60, 65V
Skip-count by 10s. Fill the blank: 10, 20, 30, 40, 50, 60, 70, ___, 90, 100M
Skip-count by 3s. Fill the blank: 3, 6, 9, 12, 15, 18, ___, 24, 27G
Skip-count by 3s. Fill the blank: 3, 6, 9, 12, 15, 18, 21, 24, 27, 30, ___, 36, 39L
Skip-count by 10s. Fill the blank: 10, 20, 30, 40, 50, 60, ___, 80, 90E
Skip-count by 2s. Fill the blank: 2, 4, 6, 8, 10, 12, 14, 16, 18, 20, 22, 24, ___, 28, 30H
0/17 letters found
Clue 4
Place value
A secret lock box has tens and ones written on the cover to hide a clue.
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
73
31
30
39
44
87
S
73
50
26
83
82
30
43
12
76
39
44
68
40
68
30
68
50
44
31
74
68
66
30
39
S
73
S
73
What number has 7 tens and 3 ones?S
What number has 8 tens and 3 ones?C
What number has 5 tens and 0 ones?O
What number has 8 tens and 7 ones?D
What number has 7 tens and 4 ones?H
What number has 3 tens and 0 ones?R
What number has 3 tens and 9 ones?A
What number has 6 tens and 8 ones?E
What number has 4 tens and 4 ones?N
What number has 4 tens and 3 ones?L
What number has 1 ten and 2 ones?Y
What number has 8 tens and 2 ones?U
What number has 2 tens and 6 ones?F
What number has 4 tens and 0 ones?W
What number has 6 tens and 6 ones?G
What number has 3 tens and 1 one?T
What number has 7 tens and 6 ones?M
0/17 letters found
Clue 5
Missing addends — the last clue
Detective Pip needs to find the missing number of gems to open the star gate.
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
2 + ___ = 7
8 + ___ = 10
1 + ___ = 5
7 + ___ = 14
7 + ___ = 15
4 + ___ = 7
3 + ___ = 9
2 + ___ = 3
10 + ___ = 20
4 + ___ = 13
3 + ___ = 15
Step 2 — cross out the sentence with each answer
1.The villain shot bright rainbow beams, then adjusted a golden saddle.
2.The villain blasted shiny glitter, then jingled a silver bell collar.
3.The villain blasted shiny glitter, then waved a bright star wand.
4.The villain made starlight sparkles, then jingled a silver bell collar.
5.The villain made starlight sparkles, then tied a silky moon ribbon.
6.The villain sprouted blooming flowers, then adjusted a golden saddle.
7.The villain shot bright rainbow beams, then tied a silky moon ribbon.
8.The villain sprouted blooming flowers, then jingled a silver bell collar.
9.The villain shot bright rainbow beams, then clicked a crystal horseshoe.
10.The villain sprouted blooming flowers, then clicked a crystal horseshoe.
11.The villain blasted shiny glitter, then tied a silky moon ribbon.
12.The villain sprouted blooming flowers, then waved a bright star wand.
Solve it
Name the culprit
Choose the one suspect left standing.
Answer Key — The Case of the Missing Star Crystal
Culprit: Pip (Glitter Blast · Moon Ribbon · Right Hoof Print · Curly Mane · Scared Of Frogs)
- Clue 1 (Addition): "THE VILLAIN DOES NOT WEAR A STAR WAND"4 + 8 = 12 (T) · 8 + 10 = 18 (E) · 13 + 6 = 19 (I) · 1 + 1 = 2 (S) · 6 + 2 = 8 (R) · 8 + 3 = 11 (O) · 3 + 1 = 4 (D) · 7 + 2 = 9 (H) · 1 + 4 = 5 (A) · 10 + 5 = 15 (V) · 9 + 7 = 16 (N) · 10 + 4 = 14 (L) · 2 + 5 = 7 (W)
- Clue 2 (Subtraction): "WITNESS SAW A RIGHT HOOF PRINT NEAR THE TREE"6 - 1 = 5 (W) · 13 - 5 = 8 (R) · 16 - 6 = 10 (H) · 20 - 9 = 11 (P) · 19 - 1 = 18 (T) · 10 - 9 = 1 (S) · 17 - 8 = 9 (N) · 17 - 1 = 16 (A) · 10 - 7 = 3 (F) · 11 - 9 = 2 (O) · 19 - 4 = 15 (G) · 12 - 5 = 7 (I) · 7 - 3 = 4 (E)
- Clue 3 (Skip counting): "THE SNEAKY VILLAIN RAN AWAY FROM GREEN FROGS"Skip-count by 10s. Fill the blank: 10, 20, 30, 40, 50, 60, 70, 80, 90, ___, 110, 120 = 100 (T) · Skip-count by 2s. Fill the blank: 2, 4, 6, 8, 10, 12, 14, 16, ___, 20, 22 = 18 (O) · Skip-count by 5s. Fill the blank: 5, 10, 15, 20, ___, 30, 35 = 25 (A) · 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, ___, 18, 21 = 15 (F) · Skip-count by 2s. Fill the blank: 2, 4, 6, 8, 10, 12, 14, ___, 18, 20 = 16 (Y) · Skip-count by 5s. Fill the blank: 5, 10, 15, 20, 25, 30, 35, 40, ___, 50, 55 = 45 (K) · Skip-count by 3s. Fill the blank: 3, 6, 9, 12, 15, 18, 21, ___, 27, 30 = 24 (S) · Skip-count by 3s. Fill the blank: 3, 6, 9, 12, 15, 18, 21, 24, 27, 30, 33, 36, ___, 42, 45 = 39 (R) · Skip-count by 2s. Fill the blank: 2, 4, 6, 8, ___, 12, 14 = 10 (N) · Skip-count by 3s. Fill the blank: 3, 6, 9, 12, 15, 18, 21, 24, ___, 30, 33 = 27 (W) · Skip-count by 5s. Fill the blank: 5, 10, 15, 20, 25, 30, 35, 40, 45, 50, ___, 60, 65 = 55 (V) · Skip-count by 10s. Fill the blank: 10, 20, 30, 40, 50, 60, 70, ___, 90, 100 = 80 (M) · Skip-count by 3s. Fill the blank: 3, 6, 9, 12, 15, 18, ___, 24, 27 = 21 (G) · Skip-count by 3s. Fill the blank: 3, 6, 9, 12, 15, 18, 21, 24, 27, 30, ___, 36, 39 = 33 (L) · Skip-count by 10s. Fill the blank: 10, 20, 30, 40, 50, 60, ___, 80, 90 = 70 (E) · Skip-count by 2s. Fill the blank: 2, 4, 6, 8, 10, 12, 14, 16, 18, 20, 22, 24, ___, 28, 30 = 26 (H)
- Clue 4 (Place value): "STRANDS OF CURLY MANE WERE ON THE GRASS"What number has 7 tens and 3 ones? = 73 (S) · What number has 8 tens and 3 ones? = 83 (C) · What number has 5 tens and 0 ones? = 50 (O) · What number has 8 tens and 7 ones? = 87 (D) · What number has 7 tens and 4 ones? = 74 (H) · What number has 3 tens and 0 ones? = 30 (R) · What number has 3 tens and 9 ones? = 39 (A) · What number has 6 tens and 8 ones? = 68 (E) · What number has 4 tens and 4 ones? = 44 (N) · What number has 4 tens and 3 ones? = 43 (L) · What number has 1 ten and 2 ones? = 12 (Y) · What number has 8 tens and 2 ones? = 82 (U) · What number has 2 tens and 6 ones? = 26 (F) · What number has 4 tens and 0 ones? = 40 (W) · What number has 6 tens and 6 ones? = 66 (G) · What number has 3 tens and 1 one? = 31 (T) · What number has 7 tens and 6 ones? = 76 (M)
- Clue 5 (Missing addends): surviving statement (box 11) → Pip2 + ___ = 7 = 5 · 8 + ___ = 10 = 2 · 1 + ___ = 5 = 4 · 7 + ___ = 14 = 7 · 7 + ___ = 15 = 8 · 4 + ___ = 7 = 3 · 3 + ___ = 9 = 6 · 2 + ___ = 3 = 1 · 10 + ___ = 20 = 10 · 4 + ___ = 13 = 9 · 3 + ___ = 15 = 12
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 Case of the Missing Star Crystal — set in Rainbow Meadow
- Format
- Interactive online & printable worksheet with answer key
- Solution
- One unique, verified culprit among 21 suspects