🔎 NothingGrade 1Reading: grades 1-2AdditionSubtractionMultiplicationSkip countingDivision
The Case of the Missing Toy Robot
Oh no! The club's favorite toy robot, Sparky, is missing from the treehouse. A sneaky thief took him! The Treehouse Club needs your help. Let us find the clues and get Sparky back!
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 | Playground Skill | Toy Gear | Writing Hand | Hair Color | Biggest Fear |
|---|---|---|---|---|---|
| Nora | fast runner | super magnet | right-handed | pink hair | loud barking |
| Luke | quick slider | bubble blaster | right-handed | pink hair | loud barking |
| Ella | loud whistler | laser boots | right-handed | blue hair | noisy music |
| Jax | loud whistler | glow ring | right-handed | blue hair | noisy music |
| Finn | quick slider | bubble blaster | right-handed | green hair | slippery slides |
| Ben | loud whistler | super magnet | left-handed | pink hair | loud barking |
| Liam | good climber | super magnet | left-handed | green hair | noisy music |
| Maya | high jumper | super magnet | right-handed | pink hair | noisy music |
| Mia | fast runner | glow ring | right-handed | blue hair | noisy music |
| Abby | loud whistler | sparkly cape | right-handed | green hair | noisy music |
| Zoe | high jumper | laser boots | left-handed | blue hair | noisy music |
| Lily | quick slider | sparkly cape | right-handed | blue hair | noisy music |
| Toby | fast runner | sparkly cape | right-handed | pink hair | noisy music |
| Ruby | loud whistler | super magnet | right-handed | blue hair | slippery slides |
| Cole | high jumper | glow ring | right-handed | blue hair | noisy music |
| Iris | high jumper | sparkly cape | left-handed | blue hair | noisy music |
| Leo | fast runner | laser boots | left-handed | green hair | noisy music |
| Sam | good climber | glow ring | right-handed | pink hair | noisy music |
| Owen | fast runner | laser boots | left-handed | blue hair | loud barking |
| Ava | good climber | laser boots | left-handed | blue hair | slippery slides |
| Chloe | quick slider | glow ring | right-handed | pink hair | slippery slides |
Clue 1
Addition
We need to count all the bright toy blocks on the floor. Let us add them up to find the secret path.
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
19
12
7
T
19
12
16
7
3
9
8
7
5
15
8
T
19
20
7
11
13
4
11
5
7
13
10
8
8
T
19
5
7 + 12 =T
7 + 9 =I
6 + 9 =N
4 + 1 =S
14 + 6 =W
7 + 5 =H
8 + 3 =A
3 + 5 =O
6 + 3 =D
7 + 6 =R
3 + 7 =B
5 + 2 =E
1 + 2 =F
3 + 1 =L
0/14 letters found
Clue 2
Subtraction
Some map pieces are gone. We had ten but some blew away. Subtract to find how many we have left.
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
6
5
10
17
15
17
1
10
4
T
6
3
9
16
T
6
10
17
3
16
T
6
5
T
6
5
10
16
9
9
16
18
5
T
6
5
8
7
2
8 - 2 =T
9 - 1 =A
16 - 1 =U
2 - 1 =P
15 - 5 =E
12 - 8 =C
11 - 8 =W
11 - 4 =N
16 - 7 =R
9 - 4 =H
17 - 1 =I
19 - 2 =S
19 - 1 =G
8 - 6 =D
0/14 letters found
Clue 3
Multiplication facts (1-12)
There are boxes of juice. Each box has three cups. Let us multiply the rows to see 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
21
77
121
49
9
49
64
121
22
T
21
66
54
49
100
54
10
121
66
T
21
77
121
100
55
9
66
60
9
49
54
22
3 × 7 =T
9 × 1 =U
11 × 5 =O
6 × 11 =D
11 × 7 =H
7 × 7 =S
8 × 8 =P
10 × 10 =L
2 × 11 =C
9 × 6 =I
10 × 6 =M
1 × 10 =K
11 × 11 =E
0/13 letters found
Clue 4
Skip counting
The sneaky footsteps go by twos. We must skip count the steps in the mud to follow the trail.
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
120
60
18
28
14
30
22
39
15
14
60
140
42
9
27
42
80
80
140
60
45
35
60
30
60
Skip-count by 10s. Fill the blank: 10, 20, 30, 40, 50, 60, 70, 80, 90, 100, 110, ___, 130, 140W
Skip-count by 3s. Fill the blank: 3, 6, 9, 12, 15, ___, 21, 24F
Skip-count by 5s. Fill the blank: 5, 10, 15, 20, 25, 30, ___, 40, 45C
Skip-count by 2s. Fill the blank: 2, 4, 6, 8, 10, 12, 14, 16, 18, 20, 22, 24, 26, ___, 30, 32O
Skip-count by 2s. Fill the blank: 2, 4, 6, 8, 10, 12, 14, 16, 18, 20, ___, 24, 26D
Skip-count by 10s. Fill the blank: 10, 20, 30, 40, 50, 60, 70, ___, 90, 100T
Skip-count by 5s. Fill the blank: 5, 10, 15, 20, 25, 30, 35, 40, ___, 50, 55S
Skip-count by 3s. Fill the blank: 3, 6, 9, 12, 15, 18, 21, 24, 27, 30, 33, 36, ___, 42, 45B
Skip-count by 2s. Fill the blank: 2, 4, 6, 8, 10, 12, ___, 16, 18U
Skip-count by 10s. Fill the blank: 10, 20, 30, 40, 50, 60, 70, 80, 90, 100, 110, 120, 130, ___, 150, 160H
Skip-count by 5s. Fill the blank: 5, 10, ___, 20, 25L
Skip-count by 10s. Fill the blank: 10, 20, 30, 40, 50, ___, 70, 80E
Skip-count by 3s. Fill the blank: 3, 6, 9, 12, 15, 18, 21, 24, 27, ___, 33, 36N
Skip-count by 3s. Fill the blank: 3, 6, 9, 12, 15, 18, 21, 24, 27, 30, 33, 36, 39, ___, 45, 48A
Skip-count by 3s. Fill the blank: 3, 6, 9, 12, 15, 18, 21, 24, ___, 30, 33R
Skip-count by 3s. Fill the blank: 3, 6, ___, 12, 15I
0/16 letters found
Clue 5
Division facts (1-12) — the last clue
We have twelve cookies to share equally. Divide them among our friends to get the next clue.
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
50 ÷ 10 = ?
40 ÷ 10 = ?
56 ÷ 7 = ?
27 ÷ 9 = ?
36 ÷ 6 = ?
50 ÷ 5 = ?
10 ÷ 10 = ?
84 ÷ 12 = ?
27 ÷ 3 = ?
144 ÷ 12 = ?
4 ÷ 2 = ?
Step 2 — cross out the sentence with each answer
1.The villain slid down the spiral slide, then flashed a glowing green ring.
2.The villain blew a shiny silver whistle, then shot a stream of giant bubbles.
3.The villain hopped over the sandbox, then stuck a magnet to the swings.
4.The villain slid down the spiral slide, then dropped a sparkly toy cape.
5.The villain blew a shiny silver whistle, then flashed a glowing green ring.
6.The villain blew a shiny silver whistle, then dropped a sparkly toy cape.
7.The villain ran past the swing set, then shot a stream of giant bubbles.
8.The villain ran past the swing set, then flashed a glowing green ring.
9.The villain slid down the spiral slide, then stuck a magnet to the swings.
10.The villain climbed up the big ladder, then stuck a magnet to the swings.
11.The villain hopped over the sandbox, then flashed a glowing green ring.
12.The villain ran past the swing set, then stuck a magnet to the swings.
Solve it
Name the culprit
Choose the one suspect left standing.
Answer Key — The Case of the Missing Toy Robot
Culprit: Cole (high jumper · glow ring · right-handed · blue hair · noisy music)
- Clue 1 (Addition): "THE THIEF DOES NOT WEAR LASER BOOTS"7 + 12 = 19 (T) · 7 + 9 = 16 (I) · 6 + 9 = 15 (N) · 4 + 1 = 5 (S) · 14 + 6 = 20 (W) · 7 + 5 = 12 (H) · 8 + 3 = 11 (A) · 3 + 5 = 8 (O) · 6 + 3 = 9 (D) · 7 + 6 = 13 (R) · 3 + 7 = 10 (B) · 5 + 2 = 7 (E) · 1 + 2 = 3 (F) · 3 + 1 = 4 (L)
- Clue 2 (Subtraction): "THE SUSPECT WRITES WITH THEIR RIGHT HAND"8 - 2 = 6 (T) · 9 - 1 = 8 (A) · 16 - 1 = 15 (U) · 2 - 1 = 1 (P) · 15 - 5 = 10 (E) · 12 - 8 = 4 (C) · 11 - 8 = 3 (W) · 11 - 4 = 7 (N) · 16 - 7 = 9 (R) · 9 - 4 = 5 (H) · 17 - 1 = 16 (I) · 19 - 2 = 17 (S) · 19 - 1 = 18 (G) · 8 - 6 = 2 (D)
- Clue 3 (Multiplication facts (1-12)): "THE SUSPECT DISLIKED THE LOUD MUSIC"3 × 7 = 21 (T) · 9 × 1 = 9 (U) · 11 × 5 = 55 (O) · 6 × 11 = 66 (D) · 11 × 7 = 77 (H) · 7 × 7 = 49 (S) · 8 × 8 = 64 (P) · 10 × 10 = 100 (L) · 2 × 11 = 22 (C) · 9 × 6 = 54 (I) · 10 × 6 = 60 (M) · 1 × 10 = 10 (K) · 11 × 11 = 121 (E)
- Clue 4 (Skip counting): "WE FOUND BLUE HAIR AT THE SCENE"Skip-count by 10s. Fill the blank: 10, 20, 30, 40, 50, 60, 70, 80, 90, 100, 110, ___, 130, 140 = 120 (W) · Skip-count by 3s. Fill the blank: 3, 6, 9, 12, 15, ___, 21, 24 = 18 (F) · Skip-count by 5s. Fill the blank: 5, 10, 15, 20, 25, 30, ___, 40, 45 = 35 (C) · Skip-count by 2s. Fill the blank: 2, 4, 6, 8, 10, 12, 14, 16, 18, 20, 22, 24, 26, ___, 30, 32 = 28 (O) · Skip-count by 2s. Fill the blank: 2, 4, 6, 8, 10, 12, 14, 16, 18, 20, ___, 24, 26 = 22 (D) · Skip-count by 10s. Fill the blank: 10, 20, 30, 40, 50, 60, 70, ___, 90, 100 = 80 (T) · Skip-count by 5s. Fill the blank: 5, 10, 15, 20, 25, 30, 35, 40, ___, 50, 55 = 45 (S) · Skip-count by 3s. Fill the blank: 3, 6, 9, 12, 15, 18, 21, 24, 27, 30, 33, 36, ___, 42, 45 = 39 (B) · Skip-count by 2s. Fill the blank: 2, 4, 6, 8, 10, 12, ___, 16, 18 = 14 (U) · Skip-count by 10s. Fill the blank: 10, 20, 30, 40, 50, 60, 70, 80, 90, 100, 110, 120, 130, ___, 150, 160 = 140 (H) · Skip-count by 5s. Fill the blank: 5, 10, ___, 20, 25 = 15 (L) · Skip-count by 10s. Fill the blank: 10, 20, 30, 40, 50, ___, 70, 80 = 60 (E) · Skip-count by 3s. Fill the blank: 3, 6, 9, 12, 15, 18, 21, 24, 27, ___, 33, 36 = 30 (N) · Skip-count by 3s. Fill the blank: 3, 6, 9, 12, 15, 18, 21, 24, 27, 30, 33, 36, 39, ___, 45, 48 = 42 (A) · Skip-count by 3s. Fill the blank: 3, 6, 9, 12, 15, 18, 21, 24, ___, 30, 33 = 27 (R) · Skip-count by 3s. Fill the blank: 3, 6, ___, 12, 15 = 9 (I)
- Clue 5 (Division facts (1-12)): surviving statement (box 11) → Cole50 ÷ 10 = 5 · 40 ÷ 10 = 4 · 56 ÷ 7 = 8 · 27 ÷ 9 = 3 · 36 ÷ 6 = 6 · 50 ÷ 5 = 10 · 10 ÷ 10 = 1 · 84 ÷ 12 = 7 · 27 ÷ 3 = 9 · 144 ÷ 12 = 12 · 4 ÷ 2 = 2
About this mystery
- Grade level
- Grade 1 math
- Math topics
- Addition, Subtraction, Multiplication, Skip counting, Division
- Reading level
- grades 1-2
- Theme
- The Case of the Missing Toy Robot — set in The Sunny Park Treehouse
- Format
- Interactive online & printable worksheet with answer key
- Solution
- One unique, verified culprit among 21 suspects