Grade 2Reading: grades 3-4Fractions of a numberPlace valueAdditionSubtraction
The Case of the Golden Spy-Glass
Oh no! The Golden Spy-Glass has been taken from the vault at the Spy Training Academy! A Rogue Agent snuck past the laser grid. We need to analyze the clues and find the culprit before they escape by submarine!
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 | Main Spy Gear | Backup Tool | Writing Hand | Hair Style | Foil Item |
|---|---|---|---|---|---|
| Agent Taj | Decoy Hologram | EMP Blaster | Right-handed | Neon Green Spikes | Squeaky Shoes |
| Agent Sky | Decoy Hologram | Night Goggles | Right-handed | Neon Green Spikes | Loud Sneezes |
| Agent Maya | Smoke Pellets | Voice Changer | Right-handed | Neon Green Spikes | Laser Pointers |
| Agent Roy | Decoy Hologram | Hacker Tablet | Left-handed | Bright Blue Mohawk | Laser Pointers |
| Agent Zoe | Camouflage Suit | Night Goggles | Right-handed | Neon Green Spikes | Laser Pointers |
| Agent Leo | Smoke Pellets | Grappling Hook | Right-handed | Neon Green Spikes | Laser Pointers |
| Agent Nova | Decoy Hologram | Hacker Tablet | Left-handed | Flame Red Curls | Loud Sneezes |
| Agent Mia | Jetpack Boots | Voice Changer | Right-handed | Neon Green Spikes | Laser Pointers |
| Agent Jax | Smoke Pellets | EMP Blaster | Right-handed | Bright Blue Mohawk | Loud Sneezes |
| Agent Ned | Smoke Pellets | Voice Changer | Left-handed | Bright Blue Mohawk | Squeaky Shoes |
| Agent Rex | Laser Watch | Voice Changer | Right-handed | Flame Red Curls | Squeaky Shoes |
| Agent Ben | Jetpack Boots | Hacker Tablet | Left-handed | Neon Green Spikes | Laser Pointers |
| Agent Dex | Decoy Hologram | Voice Changer | Right-handed | Flame Red Curls | Laser Pointers |
| Agent Joy | Decoy Hologram | Hacker Tablet | Left-handed | Flame Red Curls | Laser Pointers |
| Agent Kai | Laser Watch | Night Goggles | Right-handed | Neon Green Spikes | Laser Pointers |
| Agent Eli | Jetpack Boots | Hacker Tablet | Left-handed | Bright Blue Mohawk | Laser Pointers |
| Agent Ivy | Laser Watch | Hacker Tablet | Right-handed | Bright Blue Mohawk | Squeaky Shoes |
| Agent Max | Camouflage Suit | Hacker Tablet | Right-handed | Neon Green Spikes | Squeaky Shoes |
| Agent Kip | Camouflage Suit | Grappling Hook | Left-handed | Flame Red Curls | Laser Pointers |
| Agent Kim | Laser Watch | EMP Blaster | Right-handed | Neon Green Spikes | Squeaky Shoes |
| Agent Sam | Jetpack Boots | Night Goggles | Right-handed | Neon Green Spikes | Loud Sneezes |
Clue 1
Fractions of a number
To start our investigation, we found a pile of discarded agent badges. The clues are hidden on a specific fraction of them.
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
25
27
18
2
3
39
39
26
3
17
13
24
18
4
17
24
T
25
32
4
18
26
29
5
26
15
15
39
3
17
29
27
24
24
31
5/8 of 40 =T
2/10 of 85 =N
6/10 of 30 =E
1/2 of 6 =I
5/10 of 30 =P
2/4 of 52 =A
1/6 of 12 =V
1/5 of 120 =O
1/4 of 108 =H
1/6 of 78 =D
2/10 of 195 =L
2/8 of 124 =K
3/6 of 58 =G
4/8 of 64 =U
1/5 of 25 =R
4/6 of 6 =S
0/16 letters found
Clue 2
Place value
Next, we need to crack the electronic lock on the suspect's locker. We must look at the place value of the digits in the passcode.
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
58
41
46
34
91
34
23
46
97
T
58
29
51
13
T
58
46
34
29
13
T
58
41
T
58
41
46
13
51
51
13
35
41
T
58
41
17
61
84
What number has 5 tens and 8 ones?T
What number has 6 tens and 1 one?N
What number has 8 tens and 4 ones?D
What number has 9 tens and 7 ones?C
What number has 2 tens and 9 ones?W
What number has 3 tens and 5 ones?G
What number has 4 tens and 1 one?H
What number has 1 ten and 3 ones?I
What number has 1 ten and 7 ones?A
What number has 2 tens and 3 ones?P
What number has 4 tens and 6 ones?E
What number has 5 tens and 1 one?R
What number has 3 tens and 4 ones?S
What number has 9 tens and 1 one?U
0/14 letters found
Clue 3
Addition
A witness saw some footprints in the training yard. We need to add up all the shoe tracks to see which direction 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
49
79
74
47
39
74
T
49
46
81
33
T
49
95
36
64
T
49
74
46
80
47
80
95
81
39
79
T
49
96
36
33
74
95
97
40
81
51
T
49
74
95
33
26 + 23 =T
15 + 31 =D
28 + 19 =Y
16 + 17 =S
24 + 40 =C
40 + 56 =L
53 + 28 =I
33 + 64 =P
15 + 36 =N
26 + 14 =O
22 + 17 =G
38 + 41 =H
14 + 22 =A
57 + 38 =R
34 + 46 =B
52 + 22 =E
0/16 letters found
Clue 4
Subtraction
The suspect drained the fuel from our spy scooters! Let's subtract the stolen fuel from our total to see how far we can chase them.
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
59
79
69
11
57
70
78
70
79
11
70
52
72
79
79
70
53
85
75
33
62
40
88
75
72
75
70
74
40
79
63
79
70
74
86 - 27 =W
82 - 8 =T
105 - 33 =R
39 - 6 =K
100 - 25 =I
72 - 3 =F
115 - 30 =P
90 - 20 =N
83 - 31 =G
90 - 12 =D
103 - 40 =V
101 - 13 =A
36 - 25 =O
109 - 30 =E
58 - 5 =S
42 - 2 =H
67 - 10 =U
88 - 26 =Y
0/18 letters found
Clue 5
Fractions of a number — the last clue
We found a box of secret decoder rings left behind. We need to count a fraction of the rings to unlock the final secret.
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
3/4 of 12 = ?
4/10 of 10 = ?
2/4 of 2 = ?
2/8 of 48 = ?
2/10 of 50 = ?
1/4 of 20 = ?
3/6 of 16 = ?
1/3 of 18 = ?
3/4 of 4 = ?
5/10 of 14 = ?
3/6 of 4 = ?
Step 2 — cross out the sentence with each answer
1.The villain zapped the vault laser with a laser watch, then scanned the dark halls with night goggles.
2.The villain zapped the vault laser with a laser watch, then shut down the cameras with an EMP blaster.
3.The villain zapped the vault laser with a laser watch, then scaled the roof using a grappling hook.
4.The villain zoomed over the wall with jetpack boots, then tricked the vault lock with a voice changer.
5.The villain blended into the wall with a camouflage suit, then tricked the vault lock with a voice changer.
6.The villain escaped the lobby using smoke pellets, then scaled the roof using a grappling hook.
7.The villain zoomed over the wall with jetpack boots, then scanned the dark halls with night goggles.
8.The villain blended into the wall with a camouflage suit, then scaled the roof using a grappling hook.
9.The villain blended into the wall with a camouflage suit, then scanned the dark halls with night goggles.
10.The villain escaped the lobby using smoke pellets, then scanned the dark halls with night goggles.
11.The villain escaped the lobby using smoke pellets, then tricked the vault lock with a voice changer.
12.The villain zoomed over the wall with jetpack boots, then scaled the roof using a grappling hook.
Solve it
Name the culprit
Choose the one suspect left standing.
Answer Key — The Case of the Golden Spy-Glass
Culprit: Agent Maya (Smoke Pellets · Voice Changer · Right-handed · Neon Green Spikes · Laser Pointers)
- Clue 1 (Fractions of a number): "THE VILLAIN DOES NOT USE A GRAPPLING HOOK"5/8 of 40 = 25 (T) · 2/10 of 85 = 17 (N) · 6/10 of 30 = 18 (E) · 1/2 of 6 = 3 (I) · 5/10 of 30 = 15 (P) · 2/4 of 52 = 26 (A) · 1/6 of 12 = 2 (V) · 1/5 of 120 = 24 (O) · 1/4 of 108 = 27 (H) · 1/6 of 78 = 13 (D) · 2/10 of 195 = 39 (L) · 2/8 of 124 = 31 (K) · 3/6 of 58 = 29 (G) · 4/8 of 64 = 32 (U) · 1/5 of 25 = 5 (R) · 4/6 of 6 = 4 (S)
- Clue 2 (Place value): "THE SUSPECT WRITES WITH THEIR RIGHT HAND"What number has 5 tens and 8 ones? = 58 (T) · What number has 6 tens and 1 one? = 61 (N) · What number has 8 tens and 4 ones? = 84 (D) · What number has 9 tens and 7 ones? = 97 (C) · What number has 2 tens and 9 ones? = 29 (W) · What number has 3 tens and 5 ones? = 35 (G) · What number has 4 tens and 1 one? = 41 (H) · What number has 1 ten and 3 ones? = 13 (I) · What number has 1 ten and 7 ones? = 17 (A) · What number has 2 tens and 3 ones? = 23 (P) · What number has 4 tens and 6 ones? = 46 (E) · What number has 5 tens and 1 one? = 51 (R) · What number has 3 tens and 4 ones? = 34 (S) · What number has 9 tens and 1 one? = 91 (U)
- Clue 3 (Addition): "THEY GET DISTRACTED BY BRIGHT LASER POINTERS"26 + 23 = 49 (T) · 15 + 31 = 46 (D) · 28 + 19 = 47 (Y) · 16 + 17 = 33 (S) · 24 + 40 = 64 (C) · 40 + 56 = 96 (L) · 53 + 28 = 81 (I) · 33 + 64 = 97 (P) · 15 + 36 = 51 (N) · 26 + 14 = 40 (O) · 22 + 17 = 39 (G) · 38 + 41 = 79 (H) · 14 + 22 = 36 (A) · 57 + 38 = 95 (R) · 34 + 46 = 80 (B) · 52 + 22 = 74 (E)
- Clue 4 (Subtraction): "WE FOUND NEON GREEN SPIKY HAIR IN THE VENT"86 - 27 = 59 (W) · 82 - 8 = 74 (T) · 105 - 33 = 72 (R) · 39 - 6 = 33 (K) · 100 - 25 = 75 (I) · 72 - 3 = 69 (F) · 115 - 30 = 85 (P) · 90 - 20 = 70 (N) · 83 - 31 = 52 (G) · 90 - 12 = 78 (D) · 103 - 40 = 63 (V) · 101 - 13 = 88 (A) · 36 - 25 = 11 (O) · 109 - 30 = 79 (E) · 58 - 5 = 53 (S) · 42 - 2 = 40 (H) · 67 - 10 = 57 (U) · 88 - 26 = 62 (Y)
- Clue 5 (Fractions of a number): surviving statement (box 11) → Agent Maya3/4 of 12 = 9 · 4/10 of 10 = 4 · 2/4 of 2 = 1 · 2/8 of 48 = 12 · 2/10 of 50 = 10 · 1/4 of 20 = 5 · 3/6 of 16 = 8 · 1/3 of 18 = 6 · 3/4 of 4 = 3 · 5/10 of 14 = 7 · 3/6 of 4 = 2
About this mystery
- Grade level
- Grade 2 math
- Math topics
- Fractions of a number, Place value, Addition, Subtraction
- Reading level
- grades 3-4
- Theme
- The Case of the Golden Spy-Glass — set in the Spy Training Academy
- Format
- Interactive online & printable worksheet with answer key
- Solution
- One unique, verified culprit among 21 suspects