🤖 RobotsGrade 2Reading: grades 3-4Place valueAdditionSubtractionSkip countingMissing addends
The Assembly Yard Heist
A sneaky Rogue Bot has broken into the Robo-opolis Assembly Yard and stolen the golden power core! The Chief Mechanic needs your help to scan the bots and find the thief before they power down.
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 | Tool arm | Secondary sensor | Oil leak side | Antenna head | System glitch |
|---|---|---|---|---|---|
| Rivets | drilling claw | radar dish | right drips | green prong antenna | rust spray |
| Sprocket | sonic speaker | radar dish | right drips | green prong antenna | water splash |
| Titan | sonic speaker | night vision | left drips | red spiral wire | rust spray |
| Alloy | welding laser | thermal scope | right drips | red spiral wire | rust spray |
| Clank | sonic speaker | thermal scope | left drips | red spiral wire | water splash |
| Widget | rocket booster | solar panel | right drips | green prong antenna | water splash |
| Gadget | welding laser | thermal scope | left drips | blue wire loop | rust spray |
| Copper | rocket booster | night vision | right drips | red spiral wire | water splash |
| Cogs | magnetic beam | laser pointer | right drips | red spiral wire | rust spray |
| Axle | welding laser | radar dish | left drips | red spiral wire | magnet pull |
| Rusty | magnetic beam | thermal scope | right drips | blue wire loop | rust spray |
| Volt | rocket booster | solar panel | left drips | green prong antenna | water splash |
| Robo | magnetic beam | solar panel | left drips | red spiral wire | rust spray |
| Turbo | magnetic beam | night vision | right drips | red spiral wire | rust spray |
| Gizmo | drilling claw | night vision | left drips | red spiral wire | rust spray |
| Geary | sonic speaker | laser pointer | left drips | blue wire loop | rust spray |
| Sparky | welding laser | thermal scope | left drips | red spiral wire | rust spray |
| Blinky | magnetic beam | thermal scope | right drips | red spiral wire | water splash |
| Radar | drilling claw | solar panel | left drips | green prong antenna | water splash |
| Circuit | rocket booster | solar panel | left drips | red spiral wire | rust spray |
| Tracker | rocket booster | radar dish | left drips | red spiral wire | rust spray |
Clue 1
Place value
You boot up a broken computer screen to read the secret security code. Count the hundreds, tens, and ones to get the 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.
T
45
23
52
T
45
23
56
52
77
70
55
52
76
17
55
T
45
59
76
52
98
76
55
47
98
15
13
98
17
52
47
What number has 4 tens and 5 ones?T
What number has 7 tens and 7 ones?F
What number has 9 tens and 8 ones?A
What number has 1 ten and 7 ones?N
What number has 4 tens and 7 ones?L
What number has 7 tens and 0 ones?D
What number has 1 ten and 3 ones?P
What number has 1 ten and 5 ones?R
What number has 7 tens and 6 ones?S
What number has 5 tens and 9 ones?U
What number has 5 tens and 6 ones?I
What number has 2 tens and 3 ones?H
What number has 5 tens and 5 ones?O
What number has 5 tens and 2 ones?E
0/14 letters found
Clue 2
Addition
A scrap pile contains two bins of shiny bolts. Add the bolts in both bins together to see what the witness left behind.
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
50
30
52
96
73
24
38
79
73
71
83
92
52
79
52
48
96
65
41
38
96
41
T
50
30
52
24
52
48
T
50
83
73
38
52
28 + 22 =T
44 + 21 =U
26 + 45 =P
50 + 29 =R
37 + 55 =W
14 + 16 =H
57 + 39 =O
8 + 16 =L
27 + 14 =N
23 + 15 =D
23 + 25 =F
33 + 50 =S
26 + 26 =E
34 + 39 =I
0/14 letters found
Clue 3
Subtraction
The escape pod has a leaking fuel tank. Subtract the lost fuel from the total to find the next clue on the radar.
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
39
70
59
58
17
41
26
50
59
86
S
39
22
59
14
12
28
47
14
59
35
41
36
36
S
39
22
28
70
22
85
41
S
39
29
28
22
67 - 28 =S
33 - 11 =T
39 - 25 =E
122 - 37 =H
49 - 23 =N
86 - 39 =V
48 - 20 =O
76 - 17 =R
74 - 38 =L
50 - 15 =W
85 - 27 =A
43 - 2 =I
74 - 4 =P
36 - 7 =B
15 - 3 =M
27 - 10 =Y
52 - 2 =G
97 - 11 =U
0/18 letters found
Clue 4
Skip counting
A crate holds rows of power cells lined up in perfect rows. Skip count the cells to unlock the database file.
Solve each problem to learn its letter. Then write that letter in every box that shows the same number, and read the secret clue.
A
50
21
26
33
40
16
26
55
22
42
28
16
A
50
80
8
28
16
26
8
A
50
22
55
16
27
42
42
26
55
Skip-count by 5s. Fill the blank: 5, 10, 15, 20, 25, 30, 35, 40, 45, ___, 55, 60A
Skip-count by 2s. Fill the blank: 2, 4, 6, ___, 10, 12W
Skip-count by 3s. Fill the blank: 3, 6, 9, 12, 15, 18, 21, 24, 27, 30, ___, 36, 39N
Skip-count by 3s. Fill the blank: 3, 6, 9, 12, 15, 18, 21, 24, 27, 30, 33, 36, 39, ___, 45, 48P
Skip-count by 10s. Fill the blank: 10, 20, 30, ___, 50, 60T
Skip-count by 2s. Fill the blank: 2, 4, 6, 8, 10, 12, 14, 16, 18, 20, ___, 24, 26S
Skip-count by 3s. Fill the blank: 3, 6, 9, 12, 15, 18, ___, 24, 27B
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, 15, 18, 21, 24, ___, 30, 33O
Skip-count by 2s. Fill the blank: 2, 4, 6, 8, 10, 12, 14, ___, 18, 20R
Skip-count by 2s. Fill the blank: 2, 4, 6, 8, 10, 12, 14, 16, 18, 20, 22, 24, 26, ___, 30, 32I
Skip-count by 2s. Fill the blank: 2, 4, 6, 8, 10, 12, 14, 16, 18, 20, 22, 24, ___, 28, 30E
Skip-count by 10s. Fill the blank: 10, 20, 30, 40, 50, 60, 70, ___, 90, 100L
0/13 letters found
Clue 5
Missing addends — the last clue
The charging station needs a target power level to start. Find the missing number to boot up the system and reveal the thief.
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
6 + ___ = 13
6 + ___ = 16
9 + ___ = 21
1 + ___ = 10
7 + ___ = 11
6 + ___ = 9
8 + ___ = 9
5 + ___ = 11
4 + ___ = 9
3 + ___ = 5
8 + ___ = 16
Step 2 — cross out the sentence with each answer
1.The villain shatters the glass window with a sonic speaker, then spots the guards with a radar dish.
2.The villain zaps the safety gate with a welding laser, then spots the guards with a radar dish.
3.The villain pulls open the metal safe with a magnetic beam, then spots the guards with a radar dish.
4.The villain tunnels under the garage floor with a drilling claw, then charges up batteries with a solar panel.
5.The villain flies over the security fence with a rocket booster, then tracks heat signatures with a thermal scope.
6.The villain tunnels under the garage floor with a drilling claw, then aims at the control button with a laser pointer.
7.The villain tunnels under the garage floor with a drilling claw, then navigates the dark warehouse with night vision.
8.The villain flies over the security fence with a rocket booster, then navigates the dark warehouse with night vision.
9.The villain tunnels under the garage floor with a drilling claw, then tracks heat signatures with a thermal scope.
10.The villain shatters the glass window with a sonic speaker, then navigates the dark warehouse with night vision.
11.The villain flies over the security fence with a rocket booster, then spots the guards with a radar dish.
12.The villain zaps the safety gate with a welding laser, then tracks heat signatures with a thermal scope.
Solve it
Name the culprit
Choose the one suspect left standing.
Answer Key — The Assembly Yard Heist
Culprit: Tracker (rocket booster · radar dish · left drips · red spiral wire · rust spray)
- Clue 1 (Place value): "THE THIEF DOES NOT USE A SOLAR PANEL"What number has 4 tens and 5 ones? = 45 (T) · What number has 7 tens and 7 ones? = 77 (F) · What number has 9 tens and 8 ones? = 98 (A) · What number has 1 ten and 7 ones? = 17 (N) · What number has 4 tens and 7 ones? = 47 (L) · What number has 7 tens and 0 ones? = 70 (D) · What number has 1 ten and 3 ones? = 13 (P) · What number has 1 ten and 5 ones? = 15 (R) · What number has 7 tens and 6 ones? = 76 (S) · What number has 5 tens and 9 ones? = 59 (U) · What number has 5 tens and 6 ones? = 56 (I) · What number has 2 tens and 3 ones? = 23 (H) · What number has 5 tens and 5 ones? = 55 (O) · What number has 5 tens and 2 ones? = 52 (E)
- Clue 2 (Addition): "THE OIL DRIPS WERE FOUND ON THE LEFT SIDE"28 + 22 = 50 (T) · 44 + 21 = 65 (U) · 26 + 45 = 71 (P) · 50 + 29 = 79 (R) · 37 + 55 = 92 (W) · 14 + 16 = 30 (H) · 57 + 39 = 96 (O) · 8 + 16 = 24 (L) · 27 + 14 = 41 (N) · 23 + 15 = 38 (D) · 23 + 25 = 48 (F) · 33 + 50 = 83 (S) · 26 + 26 = 52 (E) · 34 + 39 = 73 (I)
- Clue 3 (Subtraction): "SPRAYING RUST REMOVER WILL STOP THIS BOT"67 - 28 = 39 (S) · 33 - 11 = 22 (T) · 39 - 25 = 14 (E) · 122 - 37 = 85 (H) · 49 - 23 = 26 (N) · 86 - 39 = 47 (V) · 48 - 20 = 28 (O) · 76 - 17 = 59 (R) · 74 - 38 = 36 (L) · 50 - 15 = 35 (W) · 85 - 27 = 58 (A) · 43 - 2 = 41 (I) · 74 - 4 = 70 (P) · 36 - 7 = 29 (B) · 15 - 3 = 12 (M) · 27 - 10 = 17 (Y) · 52 - 2 = 50 (G) · 97 - 11 = 86 (U)
- Clue 4 (Skip counting): "A BENT RED SPIRAL WIRE WAS DROPPED"Skip-count by 5s. Fill the blank: 5, 10, 15, 20, 25, 30, 35, 40, 45, ___, 55, 60 = 50 (A) · Skip-count by 2s. Fill the blank: 2, 4, 6, ___, 10, 12 = 8 (W) · Skip-count by 3s. Fill the blank: 3, 6, 9, 12, 15, 18, 21, 24, 27, 30, ___, 36, 39 = 33 (N) · Skip-count by 3s. Fill the blank: 3, 6, 9, 12, 15, 18, 21, 24, 27, 30, 33, 36, 39, ___, 45, 48 = 42 (P) · Skip-count by 10s. Fill the blank: 10, 20, 30, ___, 50, 60 = 40 (T) · Skip-count by 2s. Fill the blank: 2, 4, 6, 8, 10, 12, 14, 16, 18, 20, ___, 24, 26 = 22 (S) · Skip-count by 3s. Fill the blank: 3, 6, 9, 12, 15, 18, ___, 24, 27 = 21 (B) · 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, 15, 18, 21, 24, ___, 30, 33 = 27 (O) · Skip-count by 2s. Fill the blank: 2, 4, 6, 8, 10, 12, 14, ___, 18, 20 = 16 (R) · Skip-count by 2s. Fill the blank: 2, 4, 6, 8, 10, 12, 14, 16, 18, 20, 22, 24, 26, ___, 30, 32 = 28 (I) · 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 10s. Fill the blank: 10, 20, 30, 40, 50, 60, 70, ___, 90, 100 = 80 (L)
- Clue 5 (Missing addends): surviving statement (box 11) → Tracker6 + ___ = 13 = 7 · 6 + ___ = 16 = 10 · 9 + ___ = 21 = 12 · 1 + ___ = 10 = 9 · 7 + ___ = 11 = 4 · 6 + ___ = 9 = 3 · 8 + ___ = 9 = 1 · 5 + ___ = 11 = 6 · 4 + ___ = 9 = 5 · 3 + ___ = 5 = 2 · 8 + ___ = 16 = 8
About this mystery
- Grade level
- Grade 2 math
- Math topics
- Place value, Addition, Subtraction, Skip counting, Missing addends
- Reading level
- grades 3-4
- Theme
- The Assembly Yard Heist — set in Robo-opolis Assembly Yard
- Format
- Interactive online & printable worksheet with answer key
- Solution
- One unique, verified culprit among 21 suspects