🤖 RobotsGrade 2Reading: grades 1-2AdditionSubtractionPlace valueSkip countingMissing addends
The Golden Power Core Mystery
Oh no! A rogue glitch bot sneaked into the Robo-City Scrap Yard. It stole the precious Golden Power Core! We must find the right robot before its battery runs out.
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 | Super sensor | Screen light | Antenna wire | System glitch |
|---|---|---|---|---|---|
| Nano | Claw Grabber | Sonar Ear | Red Screen | Copper Coil | Magnet Pull |
| Buster | Saw Blade | Heat Sensor | Red Screen | Gold Spike | Magnet Pull |
| Sparky | Mega Magnet | Radar Eye | Blue Screen | Silver Loop | Dust Clog |
| Coco | Drill Finger | Radar Eye | Blue Screen | Gold Spike | Dust Clog |
| Zip | Saw Blade | Metal Sniffer | Red Screen | Gold Spike | Dust Clog |
| Widget | Claw Grabber | Night Vision | Red Screen | Gold Spike | Water Splash |
| Clank | Claw Grabber | Metal Sniffer | Red Screen | Silver Loop | Magnet Pull |
| Tinny | Mega Magnet | Radar Eye | Blue Screen | Silver Loop | Magnet Pull |
| Scraps | Drill Finger | Night Vision | Blue Screen | Copper Coil | Water Splash |
| Gizmo | Mega Magnet | Night Vision | Blue Screen | Gold Spike | Dust Clog |
| Dino | Drill Finger | Radar Eye | Red Screen | Copper Coil | Water Splash |
| Sprocket | Claw Grabber | Night Vision | Blue Screen | Copper Coil | Dust Clog |
| Otto | Claw Grabber | Heat Sensor | Red Screen | Gold Spike | Water Splash |
| Pixel | Claw Grabber | Sonar Ear | Red Screen | Gold Spike | Water Splash |
| Beep | Laser Welder | Heat Sensor | Blue Screen | Copper Coil | Water Splash |
| Geary | Drill Finger | Night Vision | Red Screen | Gold Spike | Water Splash |
| Toby | Saw Blade | Heat Sensor | Blue Screen | Gold Spike | Dust Clog |
| Chip | Mega Magnet | Heat Sensor | Red Screen | Gold Spike | Magnet Pull |
| Zippy | Laser Welder | Sonar Ear | Blue Screen | Gold Spike | Dust Clog |
| Bolt | Saw Blade | Night Vision | Blue Screen | Gold Spike | Water Splash |
| Rover | Saw Blade | Night Vision | Red Screen | Gold Spike | Water Splash |
Clue 1
Addition
Let us count the extra bolts in the bin. Add the two piles together to find the code.
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
71
78
64
41
24
58
47
22
41
22
T
71
58
22
64
57
76
22
T
71
78
24
60
64
24
57
22
76
24
47
64
24
47
43 + 28 =T
22 + 35 =S
46 + 30 =N
15 + 7 =O
44 + 34 =H
10 + 14 =A
28 + 30 =D
23 + 41 =E
19 + 28 =R
17 + 24 =B
42 + 18 =V
0/11 letters found
Clue 2
Subtraction
The bot lost some battery power while running away. Subtract the used energy to see what is 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
78
74
41
67
80
82
38
T
78
80
12
33
33
74
38
82
41
18
38
T
78
74
36
12
41
26
84
44
80
18
109 - 31 =T
46 - 34 =R
20 - 2 =W
69 - 25 =L
124 - 40 =G
65 - 29 =A
84 - 2 =N
74 - 36 =I
86 - 6 =O
80 - 39 =E
111 - 37 =H
93 - 26 =M
51 - 18 =S
66 - 40 =D
0/14 letters found
Clue 3
Place value
The scrap scanner has tens and ones on the screen. Look at the places to read the number.
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
18
13
77
38
50
80
A
18
87
32
51
29
88
38
A
18
29
63
80
45
38
38
29
87
77
88
45
87
What number has 1 ten and 8 ones?A
What number has 5 tens and 0 ones?D
What number has 2 tens and 9 ones?S
What number has 4 tens and 5 ones?I
What number has 1 ten and 3 ones?C
What number has 5 tens and 1 one?R
What number has 8 tens and 8 ones?P
What number has 3 tens and 2 ones?E
What number has 7 tens and 7 ones?O
What number has 8 tens and 7 ones?T
What number has 6 tens and 3 ones?H
What number has 3 tens and 8 ones?L
What number has 8 tens and 0 ones?W
0/13 letters found
Clue 4
Skip counting
We need to count the robot legs in the dark hallway. Skip count by twos to find the answer.
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
26
8
16
21
140
27
130
33
36
110
33
30
90
12
21
9
130
36
90
55
28
8
Skip-count by 2s. Fill the blank: 2, 4, 6, 8, 10, 12, 14, 16, 18, 20, 22, 24, ___, 28, 30W
Skip-count by 3s. Fill the blank: 3, 6, ___, 12, 15L
Skip-count by 3s. Fill the blank: 3, 6, 9, 12, 15, 18, 21, 24, 27, 30, ___, 36, 39A
Skip-count by 2s. Fill the blank: 2, 4, 6, 8, 10, 12, 14, 16, 18, 20, 22, 24, 26, ___, 30, 32K
Skip-count by 3s. Fill the blank: 3, 6, 9, 12, 15, 18, 21, 24, 27, ___, 33, 36R
Skip-count by 3s. Fill the blank: 3, 6, 9, 12, 15, 18, 21, 24, 27, 30, 33, ___, 39, 42S
Skip-count by 10s. Fill the blank: 10, 20, 30, 40, 50, 60, 70, 80, 90, 100, 110, 120, ___, 140, 150D
Skip-count by 2s. Fill the blank: 2, 4, 6, 8, 10, 12, 14, ___, 18, 20F
Skip-count by 2s. Fill the blank: 2, 4, 6, ___, 10, 12E
Skip-count by 3s. Fill the blank: 3, 6, 9, 12, 15, 18, ___, 24, 27O
Skip-count by 10s. Fill the blank: 10, 20, 30, 40, 50, 60, 70, 80, ___, 100, 110P
Skip-count by 10s. Fill the blank: 10, 20, 30, 40, 50, 60, 70, 80, 90, 100, ___, 120, 130H
Skip-count by 5s. Fill the blank: 5, 10, 15, 20, 25, 30, 35, 40, 45, 50, ___, 60, 65I
Skip-count by 2s. Fill the blank: 2, 4, 6, 8, 10, ___, 14, 16G
Skip-count by 10s. Fill the blank: 10, 20, 30, 40, 50, 60, 70, 80, 90, 100, 110, 120, 130, ___, 150, 160U
Skip-count by 3s. Fill the blank: 3, 6, 9, 12, 15, 18, 21, 24, ___, 30, 33N
0/16 letters found
Clue 5
Missing addends — the last clue
The power pad needs ten units to start. How many more units must we add to make ten.
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 + ___ = 15
5 + ___ = 15
1 + ___ = 4
9 + ___ = 16
10 + ___ = 21
10 + ___ = 15
7 + ___ = 8
1 + ___ = 9
1 + ___ = 7
8 + ___ = 10
6 + ___ = 18
Step 2 — cross out the sentence with each answer
1.The villain melts the metal vault with a laser welder, then hears the alarm early with a sonar ear.
2.The villain digs under the lab with a drill finger, then tracks the patrol path using a radar eye.
3.The villain cuts the security fence with a saw blade, then escapes in the dark using night vision.
4.The villain snatches the golden battery with a claw grabber, then spots the guards by using a heat sensor.
5.The villain digs under the lab with a drill finger, then finds the hidden scrap pile with a metal sniffer.
6.The villain cuts the security fence with a saw blade, then finds the hidden scrap pile with a metal sniffer.
7.The villain snatches the golden battery with a claw grabber, then tracks the patrol path using a radar eye.
8.The villain lifts the steel door with a mega magnet, then spots the guards by using a heat sensor.
9.The villain digs under the lab with a drill finger, then escapes in the dark using night vision.
10.The villain snatches the golden battery with a claw grabber, then escapes in the dark using night vision.
11.The villain melts the metal vault with a laser welder, then spots the guards by using a heat sensor.
12.The villain lifts the steel door with a mega magnet, then escapes in the dark using night vision.
Solve it
Name the culprit
Choose the one suspect left standing.
Answer Key — The Golden Power Core Mystery
Culprit: Otto (Claw Grabber · Heat Sensor · Red Screen · Gold Spike · Water Splash)
- Clue 1 (Addition): "THE BAD ROBOT DOES NOT HAVE A SONAR EAR"43 + 28 = 71 (T) · 22 + 35 = 57 (S) · 46 + 30 = 76 (N) · 15 + 7 = 22 (O) · 44 + 34 = 78 (H) · 10 + 14 = 24 (A) · 28 + 30 = 58 (D) · 23 + 41 = 64 (E) · 19 + 28 = 47 (R) · 17 + 24 = 41 (B) · 42 + 18 = 60 (V)
- Clue 2 (Subtraction): "THE MONITORS SHINE WITH A RED GLOW"109 - 31 = 78 (T) · 46 - 34 = 12 (R) · 20 - 2 = 18 (W) · 69 - 25 = 44 (L) · 124 - 40 = 84 (G) · 65 - 29 = 36 (A) · 84 - 2 = 82 (N) · 74 - 36 = 38 (I) · 86 - 6 = 80 (O) · 80 - 39 = 41 (E) · 111 - 37 = 74 (H) · 93 - 26 = 67 (M) · 51 - 18 = 33 (S) · 66 - 40 = 26 (D)
- Clue 3 (Place value): "A COLD WATER SPLASH WILL STOP IT"What number has 1 ten and 8 ones? = 18 (A) · What number has 5 tens and 0 ones? = 50 (D) · What number has 2 tens and 9 ones? = 29 (S) · What number has 4 tens and 5 ones? = 45 (I) · What number has 1 ten and 3 ones? = 13 (C) · What number has 5 tens and 1 one? = 51 (R) · What number has 8 tens and 8 ones? = 88 (P) · What number has 3 tens and 2 ones? = 32 (E) · What number has 7 tens and 7 ones? = 77 (O) · What number has 8 tens and 7 ones? = 87 (T) · What number has 6 tens and 3 ones? = 63 (H) · What number has 3 tens and 8 ones? = 38 (L) · What number has 8 tens and 0 ones? = 80 (W)
- Clue 4 (Skip counting): "WE FOUND A SHARP GOLD SPIKE"Skip-count by 2s. Fill the blank: 2, 4, 6, 8, 10, 12, 14, 16, 18, 20, 22, 24, ___, 28, 30 = 26 (W) · Skip-count by 3s. Fill the blank: 3, 6, ___, 12, 15 = 9 (L) · Skip-count by 3s. Fill the blank: 3, 6, 9, 12, 15, 18, 21, 24, 27, 30, ___, 36, 39 = 33 (A) · Skip-count by 2s. Fill the blank: 2, 4, 6, 8, 10, 12, 14, 16, 18, 20, 22, 24, 26, ___, 30, 32 = 28 (K) · Skip-count by 3s. Fill the blank: 3, 6, 9, 12, 15, 18, 21, 24, 27, ___, 33, 36 = 30 (R) · Skip-count by 3s. Fill the blank: 3, 6, 9, 12, 15, 18, 21, 24, 27, 30, 33, ___, 39, 42 = 36 (S) · Skip-count by 10s. Fill the blank: 10, 20, 30, 40, 50, 60, 70, 80, 90, 100, 110, 120, ___, 140, 150 = 130 (D) · Skip-count by 2s. Fill the blank: 2, 4, 6, 8, 10, 12, 14, ___, 18, 20 = 16 (F) · Skip-count by 2s. Fill the blank: 2, 4, 6, ___, 10, 12 = 8 (E) · Skip-count by 3s. Fill the blank: 3, 6, 9, 12, 15, 18, ___, 24, 27 = 21 (O) · Skip-count by 10s. Fill the blank: 10, 20, 30, 40, 50, 60, 70, 80, ___, 100, 110 = 90 (P) · Skip-count by 10s. Fill the blank: 10, 20, 30, 40, 50, 60, 70, 80, 90, 100, ___, 120, 130 = 110 (H) · Skip-count by 5s. Fill the blank: 5, 10, 15, 20, 25, 30, 35, 40, 45, 50, ___, 60, 65 = 55 (I) · Skip-count by 2s. Fill the blank: 2, 4, 6, 8, 10, ___, 14, 16 = 12 (G) · Skip-count by 10s. Fill the blank: 10, 20, 30, 40, 50, 60, 70, 80, 90, 100, 110, 120, 130, ___, 150, 160 = 140 (U) · Skip-count by 3s. Fill the blank: 3, 6, 9, 12, 15, 18, 21, 24, ___, 30, 33 = 27 (N)
- Clue 5 (Missing addends): surviving statement (box 4) → Otto6 + ___ = 15 = 9 · 5 + ___ = 15 = 10 · 1 + ___ = 4 = 3 · 9 + ___ = 16 = 7 · 10 + ___ = 21 = 11 · 10 + ___ = 15 = 5 · 7 + ___ = 8 = 1 · 1 + ___ = 9 = 8 · 1 + ___ = 7 = 6 · 8 + ___ = 10 = 2 · 6 + ___ = 18 = 12
About this mystery
- Grade level
- Grade 2 math
- Math topics
- Addition, Subtraction, Place value, Skip counting, Missing addends
- Reading level
- grades 1-2
- Theme
- The Golden Power Core Mystery — set in Robo-City Scrap Yard
- Format
- Interactive online & printable worksheet with answer key
- Solution
- One unique, verified culprit among 21 suspects