🤖 RobotsGrade 1Reading: grades 1-2AdditionSubtractionSkip countingPlace valueMissing addends
The Golden Gear Caper
A sneaky rogue bot has taken the Golden Gear from the Head Inventor! We need to scan the scrap yard and find the culprit before they shut down the power grid.
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 | Chest gadget | Screen mode | Wire color | System glitch |
|---|---|---|---|---|---|
| Steel | laser drill | solar panel | neon green screen | yellow brass wire | static from magnets |
| Zinc | foam blaster | jet booster | neon green screen | yellow brass wire | static from magnets |
| Circuit | plasma torch | jet booster | neon green screen | red copper wire | reboot from loud noise |
| Brass | foam blaster | sonic speaker | neon green screen | yellow brass wire | reboot from loud noise |
| Sparky | magnet claw | radar dish | bright blue screen | red copper wire | static from magnets |
| Tinny | buzz saw | jet booster | neon green screen | blue steel wire | static from magnets |
| Beep | laser drill | radar dish | neon green screen | red copper wire | freeze from cold water |
| Gizmo | laser drill | siren light | neon green screen | yellow brass wire | static from magnets |
| Copper | magnet claw | sonic speaker | neon green screen | red copper wire | static from magnets |
| Byte | buzz saw | jet booster | neon green screen | yellow brass wire | freeze from cold water |
| Widget | foam blaster | jet booster | neon green screen | red copper wire | reboot from loud noise |
| Bolt | laser drill | siren light | neon green screen | yellow brass wire | freeze from cold water |
| Chip | buzz saw | jet booster | neon green screen | yellow brass wire | static from magnets |
| Sprocket | plasma torch | solar panel | bright blue screen | yellow brass wire | reboot from loud noise |
| Buster | buzz saw | sonic speaker | bright blue screen | yellow brass wire | reboot from loud noise |
| Clanky | plasma torch | sonic speaker | neon green screen | yellow brass wire | reboot from loud noise |
| Robo | magnet claw | jet booster | neon green screen | yellow brass wire | static from magnets |
| Otto | buzz saw | jet booster | neon green screen | red copper wire | static from magnets |
| Digit | plasma torch | sonic speaker | bright blue screen | yellow brass wire | static from magnets |
| Boop | foam blaster | jet booster | bright blue screen | red copper wire | freeze from cold water |
| Rusty | buzz saw | sonic speaker | bright blue screen | yellow brass wire | static from magnets |
Clue 1
Addition
We found a pile of dropped bolts. Let us add the bolts to find the first 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
4
9
11
14
19
T
4
7
19
11
18
20
19
T
4
9
15
2
11
15
18
5
10
11
20
8
5
13
9
T
4
3 + 1 =T
4 + 9 =G
3 + 6 =H
5 + 2 =D
8 + 6 =B
3 + 5 =L
1 + 1 =V
5 + 10 =A
5 + 5 =R
4 + 7 =E
3 + 2 =I
12 + 6 =S
7 + 13 =N
8 + 11 =O
0/14 letters found
Clue 2
Subtraction
The bot lost some fuel on the floor. Take away the spilled drops to see where they 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
5
15
8
1
11
T
5
15
19
18
19
6
8
11
6
13
12
8
8
6
18
14
12
8
8
6
12 - 7 =T
20 - 1 =A
18 - 6 =R
17 - 2 =H
7 - 1 =N
13 - 2 =O
18 - 5 =G
19 - 5 =C
19 - 1 =S
8 - 7 =B
13 - 5 =E
0/11 letters found
Clue 3
Skip counting
Count the robot footprints by twos. It will lead us to a big 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.
M
33
60
21
45
28
110
100
30
22
18
18
10
60
26
100
28
100
110
60
110
22
10
Skip-count by 3s. Fill the blank: 3, 6, 9, 12, 15, 18, 21, 24, 27, 30, ___, 36, 39M
Skip-count by 10s. Fill the blank: 10, 20, 30, 40, 50, 60, 70, 80, 90, 100, ___, 120, 130T
Skip-count by 2s. Fill the blank: 2, 4, 6, 8, 10, 12, 14, 16, ___, 20, 22L
Skip-count by 2s. Fill the blank: 2, 4, 6, 8, 10, 12, 14, 16, 18, 20, 22, 24, ___, 28, 30U
Skip-count by 10s. Fill the blank: 10, 20, 30, 40, 50, 60, 70, 80, 90, ___, 110, 120S
Skip-count by 5s. Fill the blank: 5, 10, 15, 20, 25, 30, 35, 40, 45, 50, 55, ___, 65, 70A
Skip-count by 2s. Fill the blank: 2, 4, 6, 8, 10, 12, 14, 16, 18, 20, ___, 24, 26I
Skip-count by 3s. Fill the blank: 3, 6, 9, 12, 15, 18, ___, 24, 27G
Skip-count by 5s. Fill the blank: 5, 10, 15, 20, 25, ___, 35, 40W
Skip-count by 2s. Fill the blank: 2, 4, 6, 8, ___, 12, 14C
Skip-count by 2s. Fill the blank: 2, 4, 6, 8, 10, 12, 14, 16, 18, 20, 22, 24, 26, ___, 30, 32E
Skip-count by 5s. Fill the blank: 5, 10, 15, 20, 25, 30, 35, 40, ___, 50, 55N
0/12 letters found
Clue 4
Place value
Look at these helper cards. Count the tens and ones blocks to read the next hint.
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
32
16
27
86
50
84
25
90
16
36
36
86
W
32
37
95
45
52
52
W
32
42
95
16
What number has 3 tens and 2 ones?W
What number has 8 tens and 6 ones?O
What number has 9 tens and 0 ones?Y
What number has 2 tens and 5 ones?D
What number has 5 tens and 0 ones?U
What number has 1 ten and 6 ones?E
What number has 3 tens and 7 ones?B
What number has 2 tens and 7 ones?F
What number has 4 tens and 5 ones?A
What number has 4 tens and 2 ones?I
What number has 8 tens and 4 ones?N
What number has 9 tens and 5 ones?R
What number has 3 tens and 6 ones?L
What number has 5 tens and 2 ones?S
0/14 letters found
Clue 5
Missing addends — the last clue
We have six total gears but we only see four. Find the missing number to open the box.
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
10 + ___ = 19
1 + ___ = 8
1 + ___ = 9
7 + ___ = 8
5 + ___ = 10
4 + ___ = 8
6 + ___ = 8
4 + ___ = 16
2 + ___ = 13
1 + ___ = 11
3 + ___ = 9
Step 2 — cross out the sentence with each answer
1.The villain sprayed sticky blue foam, then scanned the room for alarms.
2.The villain melted the steel lock, then charged up in the sunlight.
3.The villain used a strong magnet claw, then zoomed away into the sky.
4.The villain melted the steel lock, then zoomed away into the sky.
5.The villain melted the steel lock, then flashed a bright red light.
6.The villain cut the thick iron pipes, then scanned the room for alarms.
7.The villain cut the thick iron pipes, then zoomed away into the sky.
8.The villain drilled through the metal wall, then charged up in the sunlight.
9.The villain sprayed sticky blue foam, then zoomed away into the sky.
10.The villain cut the thick iron pipes, then charged up in the sunlight.
11.The villain used a strong magnet claw, then scanned the room for alarms.
12.The villain melted the steel lock, then scanned the room for alarms.
Solve it
Name the culprit
Choose the one suspect left standing.
Answer Key — The Golden Gear Caper
Culprit: Robo (magnet claw · jet booster · neon green screen · yellow brass wire · static from magnets)
- Clue 1 (Addition): "THE BOT DOES NOT HAVE A SIREN LIGHT"3 + 1 = 4 (T) · 4 + 9 = 13 (G) · 3 + 6 = 9 (H) · 5 + 2 = 7 (D) · 8 + 6 = 14 (B) · 3 + 5 = 8 (L) · 1 + 1 = 2 (V) · 5 + 10 = 15 (A) · 5 + 5 = 10 (R) · 4 + 7 = 11 (E) · 3 + 2 = 5 (I) · 12 + 6 = 18 (S) · 7 + 13 = 20 (N) · 8 + 11 = 19 (O)
- Clue 2 (Subtraction): "THE BOT HAS A NEON GREEN SCREEN"12 - 7 = 5 (T) · 20 - 1 = 19 (A) · 18 - 6 = 12 (R) · 17 - 2 = 15 (H) · 7 - 1 = 6 (N) · 13 - 2 = 11 (O) · 18 - 5 = 13 (G) · 19 - 5 = 14 (C) · 19 - 1 = 18 (S) · 8 - 7 = 1 (B) · 13 - 5 = 8 (E)
- Clue 3 (Skip counting): "MAGNETS WILL CAUSE STATIC"Skip-count by 3s. Fill the blank: 3, 6, 9, 12, 15, 18, 21, 24, 27, 30, ___, 36, 39 = 33 (M) · Skip-count by 10s. Fill the blank: 10, 20, 30, 40, 50, 60, 70, 80, 90, 100, ___, 120, 130 = 110 (T) · Skip-count by 2s. Fill the blank: 2, 4, 6, 8, 10, 12, 14, 16, ___, 20, 22 = 18 (L) · Skip-count by 2s. Fill the blank: 2, 4, 6, 8, 10, 12, 14, 16, 18, 20, 22, 24, ___, 28, 30 = 26 (U) · Skip-count by 10s. Fill the blank: 10, 20, 30, 40, 50, 60, 70, 80, 90, ___, 110, 120 = 100 (S) · Skip-count by 5s. Fill the blank: 5, 10, 15, 20, 25, 30, 35, 40, 45, 50, 55, ___, 65, 70 = 60 (A) · Skip-count by 2s. Fill the blank: 2, 4, 6, 8, 10, 12, 14, 16, 18, 20, ___, 24, 26 = 22 (I) · Skip-count by 3s. Fill the blank: 3, 6, 9, 12, 15, 18, ___, 24, 27 = 21 (G) · Skip-count by 5s. Fill the blank: 5, 10, 15, 20, 25, ___, 35, 40 = 30 (W) · Skip-count by 2s. Fill the blank: 2, 4, 6, 8, ___, 12, 14 = 10 (C) · Skip-count by 2s. Fill the blank: 2, 4, 6, 8, 10, 12, 14, 16, 18, 20, 22, 24, 26, ___, 30, 32 = 28 (E) · Skip-count by 5s. Fill the blank: 5, 10, 15, 20, 25, 30, 35, 40, ___, 50, 55 = 45 (N)
- Clue 4 (Place value): "WE FOUND YELLOW BRASS WIRE"What number has 3 tens and 2 ones? = 32 (W) · What number has 8 tens and 6 ones? = 86 (O) · What number has 9 tens and 0 ones? = 90 (Y) · What number has 2 tens and 5 ones? = 25 (D) · What number has 5 tens and 0 ones? = 50 (U) · What number has 1 ten and 6 ones? = 16 (E) · What number has 3 tens and 7 ones? = 37 (B) · What number has 2 tens and 7 ones? = 27 (F) · What number has 4 tens and 5 ones? = 45 (A) · What number has 4 tens and 2 ones? = 42 (I) · What number has 8 tens and 4 ones? = 84 (N) · What number has 9 tens and 5 ones? = 95 (R) · What number has 3 tens and 6 ones? = 36 (L) · What number has 5 tens and 2 ones? = 52 (S)
- Clue 5 (Missing addends): surviving statement (box 3) → Robo10 + ___ = 19 = 9 · 1 + ___ = 8 = 7 · 1 + ___ = 9 = 8 · 7 + ___ = 8 = 1 · 5 + ___ = 10 = 5 · 4 + ___ = 8 = 4 · 6 + ___ = 8 = 2 · 4 + ___ = 16 = 12 · 2 + ___ = 13 = 11 · 1 + ___ = 11 = 10 · 3 + ___ = 9 = 6
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 Golden Gear Caper — set in Robo-City Scrap Yard
- Format
- Interactive online & printable worksheet with answer key
- Solution
- One unique, verified culprit among 21 suspects