🤖 RobotsGrade 2Reading: grades 1-2AdditionPlace valueSubtractionSkip countingMissing addends
The Golden Gear Glitch
A rogue robot ran off with the Golden Gear! The head mechanic needs your help to find which robot did it before Spark City loses all its power.
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 hand | special sensor | light position | antenna shape | glitch trigger |
|---|---|---|---|---|---|
| Gizmo | laser cutter | sonar ears | left blinker | bolt antenna | strong magnet |
| Sprocket | grease spray | night vision | right blinker | star antenna | strong magnet |
| Boop | laser cutter | sonar ears | right blinker | star antenna | loud whistle |
| Bolt | drill finger | sonar ears | left blinker | hoop antenna | strong magnet |
| Rusty | laser cutter | radar nose | left blinker | star antenna | strong magnet |
| Micro | laser cutter | sonar ears | right blinker | bolt antenna | soapy water |
| Geary | clamp claw | radar nose | left blinker | hoop antenna | soapy water |
| Beep | drill finger | heat sensor | left blinker | bolt antenna | loud whistle |
| Pixel | grease spray | radar nose | left blinker | star antenna | loud whistle |
| Rivet | magnet arm | heat sensor | left blinker | hoop antenna | loud whistle |
| Dynamo | grease spray | metal detector | right blinker | star antenna | soapy water |
| Charger | laser cutter | radar nose | right blinker | bolt antenna | loud whistle |
| Clanky | clamp claw | night vision | left blinker | bolt antenna | loud whistle |
| Turbo | clamp claw | metal detector | left blinker | bolt antenna | loud whistle |
| Sparky | clamp claw | night vision | right blinker | hoop antenna | loud whistle |
| Zinc | laser cutter | night vision | right blinker | hoop antenna | loud whistle |
| Vector | grease spray | radar nose | left blinker | bolt antenna | strong magnet |
| Orbit | magnet arm | night vision | right blinker | hoop antenna | soapy water |
| Widget | grease spray | sonar ears | left blinker | bolt antenna | loud whistle |
| Radar | clamp claw | sonar ears | left blinker | bolt antenna | loud whistle |
| Byte | grease spray | metal detector | right blinker | bolt antenna | soapy water |
Clue 1
Addition
The scrap pile has six red gears and five blue gears. Add them together to find how many gears the robot dropped.
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
63
28
22
21
52
84
52
T
63
96
52
22
89
43
52
T
63
28
55
49
22
43
59
88
28
T
63
49
59
89
59
52
43
19 + 44 =T
36 + 52 =G
44 + 52 =D
15 + 7 =E
17 + 11 =H
23 + 20 =N
21 + 28 =V
31 + 24 =A
22 + 37 =I
14 + 7 =R
23 + 29 =O
55 + 34 =S
49 + 35 =B
0/13 letters found
Clue 2
Place value
We checked the battery power screen. It shows a number with four tens and seven ones. Read the screen to find 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
39
61
64
27
75
20
75
T
39
61
51
86
51
48
64
32
T
39
20
48
29
28
65
64
27
What number has 3 tens and 9 ones?T
What number has 6 tens and 4 ones?E
What number has 2 tens and 9 ones?I
What number has 8 tens and 6 ones?S
What number has 2 tens and 8 ones?N
What number has 5 tens and 1 one?A
What number has 4 tens and 8 ones?L
What number has 3 tens and 2 ones?F
What number has 6 tens and 5 ones?K
What number has 2 tens and 7 ones?R
What number has 2 tens and 0 ones?B
What number has 7 tens and 5 ones?O
What number has 6 tens and 1 one?H
0/13 letters found
Clue 3
Subtraction
The robot had ten tiny screws but lost eight of them. Subtract to find how many screws are left on the floor.
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
23
44
28
75
78
72
78
T
23
34
28
35
75
48
35
50
78
36
69
63
44
67
48
T
23
50
28
55 - 32 =T
82 - 34 =S
66 - 16 =L
82 - 13 =D
113 - 38 =R
58 - 24 =F
96 - 18 =O
70 - 35 =A
64 - 1 =W
46 - 2 =H
46 - 18 =E
43 - 7 =U
87 - 20 =I
77 - 5 =B
0/14 letters found
Clue 4
Skip counting
Look at the footprints in the grease. They are in groups of two. Count by twos to see how many steps the robot made.
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
90
130
18
16
40
21
12
39
33
16
100
9
39
21
9
130
21
21
39
Skip-count by 10s. Fill the blank: 10, 20, 30, 40, 50, 60, 70, 80, ___, 100, 110W
Skip-count by 3s. Fill the blank: 3, 6, ___, 12, 15T
Skip-count by 3s. Fill the blank: 3, 6, 9, 12, 15, 18, 21, 24, 27, 30, 33, 36, ___, 42, 45A
Skip-count by 3s. Fill the blank: 3, 6, 9, 12, 15, 18, ___, 24, 27N
Skip-count by 3s. Fill the blank: 3, 6, 9, 12, 15, 18, 21, 24, 27, 30, ___, 36, 39B
Skip-count by 10s. Fill the blank: 10, 20, 30, 40, 50, 60, 70, 80, 90, ___, 110, 120L
Skip-count by 3s. Fill the blank: 3, 6, 9, 12, 15, ___, 21, 24F
Skip-count by 2s. Fill the blank: 2, 4, 6, 8, 10, 12, 14, ___, 18, 20O
Skip-count by 10s. Fill the blank: 10, 20, 30, 40, 50, 60, 70, 80, 90, 100, 110, 120, ___, 140, 150E
Skip-count by 10s. Fill the blank: 10, 20, 30, ___, 50, 60U
Skip-count by 3s. Fill the blank: 3, 6, 9, ___, 15, 18D
0/11 letters found
Clue 5
Missing addends — the last clue
The tool box holds eight bolts. We only see five. How many more bolts do we need to make eight? Find the missing number.
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
9 + ___ = 21
6 + ___ = 17
2 + ___ = 12
10 + ___ = 12
7 + ___ = 10
10 + ___ = 16
6 + ___ = 15
9 + ___ = 14
5 + ___ = 6
4 + ___ = 8
10 + ___ = 18
Step 2 — cross out the sentence with each answer
1.The villain spins a drill finger, then sweeps with a metal detector.
2.The villain uses a laser cutter, then beeps with a radar nose.
3.The villain spins a drill finger, then turns on sonar ears.
4.The villain shoots a grease spray, then sweeps with a metal detector.
5.The villain snaps a clamp claw, then scans with a heat sensor.
6.The villain snaps a clamp claw, then beeps with a radar nose.
7.The villain snaps a clamp claw, then turns on sonar ears.
8.The villain waves a magnet arm, then glows with night vision.
9.The villain shoots a grease spray, then scans with a heat sensor.
10.The villain snaps a clamp claw, then sweeps with a metal detector.
11.The villain spins a drill finger, then scans with a heat sensor.
12.The villain shoots a grease spray, then turns on sonar ears.
Solve it
Name the culprit
Choose the one suspect left standing.
Answer Key — The Golden Gear Glitch
Culprit: Radar (clamp claw · sonar ears · left blinker · bolt antenna · loud whistle)
- Clue 1 (Addition): "THE ROBOT DOES NOT HAVE NIGHT VISION"19 + 44 = 63 (T) · 36 + 52 = 88 (G) · 44 + 52 = 96 (D) · 15 + 7 = 22 (E) · 17 + 11 = 28 (H) · 23 + 20 = 43 (N) · 21 + 28 = 49 (V) · 31 + 24 = 55 (A) · 22 + 37 = 59 (I) · 14 + 7 = 21 (R) · 23 + 29 = 52 (O) · 55 + 34 = 89 (S) · 49 + 35 = 84 (B)
- Clue 2 (Place value): "THE ROBOT HAS A LEFT BLINKER"What number has 3 tens and 9 ones? = 39 (T) · What number has 6 tens and 4 ones? = 64 (E) · What number has 2 tens and 9 ones? = 29 (I) · What number has 8 tens and 6 ones? = 86 (S) · What number has 2 tens and 8 ones? = 28 (N) · What number has 5 tens and 1 one? = 51 (A) · What number has 4 tens and 8 ones? = 48 (L) · What number has 3 tens and 2 ones? = 32 (F) · What number has 6 tens and 5 ones? = 65 (K) · What number has 2 tens and 7 ones? = 27 (R) · What number has 2 tens and 0 ones? = 20 (B) · What number has 7 tens and 5 ones? = 75 (O) · What number has 6 tens and 1 one? = 61 (H)
- Clue 3 (Subtraction): "THE ROBOT FEARS A LOUD WHISTLE"55 - 32 = 23 (T) · 82 - 34 = 48 (S) · 66 - 16 = 50 (L) · 82 - 13 = 69 (D) · 113 - 38 = 75 (R) · 58 - 24 = 34 (F) · 96 - 18 = 78 (O) · 70 - 35 = 35 (A) · 64 - 1 = 63 (W) · 46 - 2 = 44 (H) · 46 - 18 = 28 (E) · 43 - 7 = 36 (U) · 87 - 20 = 67 (I) · 77 - 5 = 72 (B)
- Clue 4 (Skip counting): "WE FOUND A BOLT ANTENNA"Skip-count by 10s. Fill the blank: 10, 20, 30, 40, 50, 60, 70, 80, ___, 100, 110 = 90 (W) · Skip-count by 3s. Fill the blank: 3, 6, ___, 12, 15 = 9 (T) · 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 3s. Fill the blank: 3, 6, 9, 12, 15, 18, ___, 24, 27 = 21 (N) · Skip-count by 3s. Fill the blank: 3, 6, 9, 12, 15, 18, 21, 24, 27, 30, ___, 36, 39 = 33 (B) · Skip-count by 10s. Fill the blank: 10, 20, 30, 40, 50, 60, 70, 80, 90, ___, 110, 120 = 100 (L) · Skip-count by 3s. Fill the blank: 3, 6, 9, 12, 15, ___, 21, 24 = 18 (F) · Skip-count by 2s. Fill the blank: 2, 4, 6, 8, 10, 12, 14, ___, 18, 20 = 16 (O) · Skip-count by 10s. Fill the blank: 10, 20, 30, 40, 50, 60, 70, 80, 90, 100, 110, 120, ___, 140, 150 = 130 (E) · Skip-count by 10s. Fill the blank: 10, 20, 30, ___, 50, 60 = 40 (U) · Skip-count by 3s. Fill the blank: 3, 6, 9, ___, 15, 18 = 12 (D)
- Clue 5 (Missing addends): surviving statement (box 7) → Radar9 + ___ = 21 = 12 · 6 + ___ = 17 = 11 · 2 + ___ = 12 = 10 · 10 + ___ = 12 = 2 · 7 + ___ = 10 = 3 · 10 + ___ = 16 = 6 · 6 + ___ = 15 = 9 · 9 + ___ = 14 = 5 · 5 + ___ = 6 = 1 · 4 + ___ = 8 = 4 · 10 + ___ = 18 = 8
About this mystery
- Grade level
- Grade 2 math
- Math topics
- Addition, Place value, Subtraction, Skip counting, Missing addends
- Reading level
- grades 1-2
- Theme
- The Golden Gear Glitch — set in Spark City
- Format
- Interactive online & printable worksheet with answer key
- Solution
- One unique, verified culprit among 21 suspects