🔎 Harry Potter book sevenGrade 5Reading: grades 3-4Fractions of a numberOrder of operationsMultiplicationRoundingDivision
The Case of the Slytherin Locket
A rogue Snatcher has snuck into our camp under the cover of night and stolen Slytherin's golden locket! We must search the misty forest and use our magic to track down the thief before they escape.
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 | Spells Cast | Enchanted Gear | Wand Hand | Hair Color | Fear of Spell |
|---|---|---|---|---|---|
| Lupin | Protego | Deluminator | Right Handed | Fiery Ginger | Riddikulus Spell |
| Oliver | Expelliarmus | Sneakoscope | Right Handed | Raven Black | Patronus Charm |
| Cho | Protego | Extendable Ears | Left Handed | Fiery Ginger | Patronus Charm |
| Luna | Expelliarmus | Invisibility Cloak | Right Handed | Sandy Blonde | Patronus Charm |
| Fleur | Stupefy | Sneakoscope | Right Handed | Raven Black | Patronus Charm |
| Seamus | Diffindo | Deluminator | Right Handed | Raven Black | Riddikulus Spell |
| Neville | Confundo | Deluminator | Right Handed | Fiery Ginger | Patronus Charm |
| Molly | Diffindo | Invisibility Cloak | Right Handed | Raven Black | Patronus Charm |
| Xenophilius | Stupefy | Sneakoscope | Left Handed | Raven Black | Patronus Charm |
| Bill | Protego | Peruvian Instant Darkness Powder | Right Handed | Raven Black | Patronus Charm |
| Dean | Confundo | Deluminator | Right Handed | Fiery Ginger | Reductor Curse |
| George | Stupefy | Deluminator | Right Handed | Fiery Ginger | Riddikulus Spell |
| Hermione | Stupefy | Extendable Ears | Right Handed | Fiery Ginger | Patronus Charm |
| Aberforth | Diffindo | Sneakoscope | Right Handed | Fiery Ginger | Reductor Curse |
| Padma | Stupefy | Deluminator | Right Handed | Sandy Blonde | Reductor Curse |
| Parvati | Confundo | Invisibility Cloak | Right Handed | Fiery Ginger | Reductor Curse |
| Arthur | Protego | Sneakoscope | Right Handed | Raven Black | Riddikulus Spell |
| Kingsley | Protego | Extendable Ears | Right Handed | Raven Black | Riddikulus Spell |
| Percy | Stupefy | Deluminator | Right Handed | Raven Black | Patronus Charm |
| Ron | Diffindo | Invisibility Cloak | Right Handed | Raven Black | Riddikulus Spell |
| Ginny | Confundo | Peruvian Instant Darkness Powder | Left Handed | Raven Black | Patronus Charm |
Clue 1
Fractions of a number
We found a torn bag of Galleons on the forest floor. If we calculate the exact fraction of gold left inside, we can unlock the first secret memo about the thief.
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
35
19
37
T
35
19
18
37
11
40
10
37
13
34
10
T
35
23
27
30
30
33
27
40
37
38
25
20
18
34
27
T
35
10
30
1/5 of 175 =T
1/8 of 200 =U
1/2 of 22 =F
4/6 of 27 =I
2/6 of 114 =L
4/8 of 68 =N
2/10 of 115 =C
2/8 of 148 =E
3/6 of 66 =Y
2/6 of 57 =H
1/4 of 80 =M
1/4 of 120 =R
1/8 of 104 =S
2/8 of 160 =D
1/4 of 40 =O
6/8 of 36 =A
0/16 letters found
Clue 2
Order of operations
The thief scrambled the magic locks on an old wooden trunk. Solve the multi-step spell equation in the correct order to open the lid and find the next 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
53
14
38
72
18
72
51
38
49
T
53
49
78
72
T
53
72
51
38
6
6
72
12
63
T
53
14
T
53
14
38
63
36
36
63
35
14
T
53
14
78
26
28
6 × 10 - 7 =T
2 + 7 × 7 =P
5 × 4 - 6 =H
3 + 3 × 3 =W
8 × 6 - 22 =N
32 + 2 × 3 =E
2 + 2 × 8 =U
23 + 2 × 6 =G
24 + 2 × 6 =R
11 × 9 - 27 =S
8 × 10 - 17 =I
6 × 10 - 11 =C
10 × 5 - 22 =D
9 × 10 - 12 =A
4 × 4 - 10 =L
0/15 letters found
Clue 3
Multiplication facts (1-12)
Hermione spots several rows of sleeping potions stacked neatly on a shelf. Counting the total bottles in these equal groups reveals the suspect's spell weakness.
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
108
35
25
121
80
80
60
121
90
56
60
90
60
20
60
16
96
56
33
28
60
63
80
33
20
121
90
63
77
60
T
50
56
33
90
30
15
5 × 10 =T
7 × 5 =E
12 × 9 =H
8 × 10 =L
7 × 11 =P
8 × 2 =Y
5 × 5 =V
10 × 9 =N
8 × 12 =F
3 × 10 =U
7 × 8 =R
7 × 9 =G
11 × 11 =I
2 × 10 =W
5 × 3 =S
6 × 10 =A
4 × 7 =M
11 × 3 =O
0/18 letters found
Clue 4
Rounding
Our Sneakoscope is spinning and buzzing! The magic detector only shows numbers rounded to the nearest ten, but it will help us identify the hair color we need.
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
1300
300
500
290
3000
3700
20
200
70
2000
30
3700
20
200
290
500
2000
30
50
300
3700
2300
900
30
9000
4300
2900
30
110
2000
Round 1,317 to the nearest hundredW
Round 181 to the nearest hundredS
Round 111 to the nearest tenI
Round 3,151 to the nearest thousandU
Round 1,848 to the nearest thousandR
Round 859 to the nearest hundredL
Round 52 to the nearest tenV
Round 8,835 to the nearest thousandC
Round 496 to the nearest hundredF
Round 32 to the nearest tenA
Round 314 to the nearest hundredE
Round 2,270 to the nearest hundredB
Round 291 to the nearest tenO
Round 2,910 to the nearest hundredH
Round 4,254 to the nearest hundredK
Round 72 to the nearest tenT
Round 23 to the nearest tenD
Round 3,700 to the nearest hundredN
0/18 letters found
Clue 5
Division facts (1-12) — the last clue
We need to share our remaining supply of Gillyweed equally among the search party. Doing the math correctly points us directly to the hand the thief uses to cast magic.
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
15 ÷ 3 = ?
6 ÷ 3 = ?
70 ÷ 7 = ?
8 ÷ 2 = ?
44 ÷ 4 = ?
108 ÷ 9 = ?
36 ÷ 4 = ?
56 ÷ 8 = ?
64 ÷ 8 = ?
15 ÷ 5 = ?
48 ÷ 8 = ?
Step 2 — cross out the sentence with each answer
1.The villain fired a red stunning spell, then spun a spinning sneakoscope.
2.The villain sliced open the tent wall, then vanished under an invisibility cloak.
3.The villain sliced open the tent wall, then clicked a dark deluminator.
4.The villain fired a red stunning spell, then clicked a dark deluminator.
5.The villain blasted a disarming charm, then spun a spinning sneakoscope.
6.The villain fired a red stunning spell, then dropped some long extendable ears.
7.The villain sliced open the tent wall, then threw down pitch black darkness powder.
8.The villain blasted a disarming charm, then dropped some long extendable ears.
9.The villain confused the camp guard, then clicked a dark deluminator.
10.The villain raised a shimmering shield, then threw down pitch black darkness powder.
11.The villain raised a shimmering shield, then spun a spinning sneakoscope.
12.The villain fired a red stunning spell, then vanished under an invisibility cloak.
Solve it
Name the culprit
Choose the one suspect left standing.
Answer Key — The Case of the Slytherin Locket
Culprit: Fleur (Stupefy · Sneakoscope · Right Handed · Raven Black · Patronus Charm)
- Clue 1 (Fractions of a number): "THE THIEF DOES NOT CARRY A DELUMINATOR"1/5 of 175 = 35 (T) · 1/8 of 200 = 25 (U) · 1/2 of 22 = 11 (F) · 4/6 of 27 = 18 (I) · 2/6 of 114 = 38 (L) · 4/8 of 68 = 34 (N) · 2/10 of 115 = 23 (C) · 2/8 of 148 = 37 (E) · 3/6 of 66 = 33 (Y) · 2/6 of 57 = 19 (H) · 1/4 of 80 = 20 (M) · 1/4 of 120 = 30 (R) · 1/8 of 104 = 13 (S) · 2/8 of 160 = 40 (D) · 1/4 of 40 = 10 (O) · 6/8 of 36 = 27 (A)
- Clue 2 (Order of operations): "THE SUSPECT CAST SPELLS WITH THEIR RIGHT HAND"6 × 10 - 7 = 53 (T) · 2 + 7 × 7 = 51 (P) · 5 × 4 - 6 = 14 (H) · 3 + 3 × 3 = 12 (W) · 8 × 6 - 22 = 26 (N) · 32 + 2 × 3 = 38 (E) · 2 + 2 × 8 = 18 (U) · 23 + 2 × 6 = 35 (G) · 24 + 2 × 6 = 36 (R) · 11 × 9 - 27 = 72 (S) · 8 × 10 - 17 = 63 (I) · 6 × 10 - 11 = 49 (C) · 10 × 5 - 22 = 28 (D) · 9 × 10 - 12 = 78 (A) · 4 × 4 - 10 = 6 (L)
- Clue 3 (Multiplication facts (1-12)): "THE VILLAIN RAN AWAY FROM A GLOWING PATRONUS"5 × 10 = 50 (T) · 7 × 5 = 35 (E) · 12 × 9 = 108 (H) · 8 × 10 = 80 (L) · 7 × 11 = 77 (P) · 8 × 2 = 16 (Y) · 5 × 5 = 25 (V) · 10 × 9 = 90 (N) · 8 × 12 = 96 (F) · 3 × 10 = 30 (U) · 7 × 8 = 56 (R) · 7 × 9 = 63 (G) · 11 × 11 = 121 (I) · 2 × 10 = 20 (W) · 5 × 3 = 15 (S) · 6 × 10 = 60 (A) · 4 × 7 = 28 (M) · 11 × 3 = 33 (O)
- Clue 4 (Rounding): "WE FOUND STRANDS OF RAVEN BLACK HAIR"Round 1,317 to the nearest hundred = 1300 (W) · Round 181 to the nearest hundred = 200 (S) · Round 111 to the nearest ten = 110 (I) · Round 3,151 to the nearest thousand = 3000 (U) · Round 1,848 to the nearest thousand = 2000 (R) · Round 859 to the nearest hundred = 900 (L) · Round 52 to the nearest ten = 50 (V) · Round 8,835 to the nearest thousand = 9000 (C) · Round 496 to the nearest hundred = 500 (F) · Round 32 to the nearest ten = 30 (A) · Round 314 to the nearest hundred = 300 (E) · Round 2,270 to the nearest hundred = 2300 (B) · Round 291 to the nearest ten = 290 (O) · Round 2,910 to the nearest hundred = 2900 (H) · Round 4,254 to the nearest hundred = 4300 (K) · Round 72 to the nearest ten = 70 (T) · Round 23 to the nearest ten = 20 (D) · Round 3,700 to the nearest hundred = 3700 (N)
- Clue 5 (Division facts (1-12)): surviving statement (box 1) → Fleur15 ÷ 3 = 5 · 6 ÷ 3 = 2 · 70 ÷ 7 = 10 · 8 ÷ 2 = 4 · 44 ÷ 4 = 11 · 108 ÷ 9 = 12 · 36 ÷ 4 = 9 · 56 ÷ 8 = 7 · 64 ÷ 8 = 8 · 15 ÷ 5 = 3 · 48 ÷ 8 = 6
About this mystery
- Grade level
- Grade 5 math
- Math topics
- Fractions of a number, Order of operations, Multiplication, Rounding, Division
- Reading level
- grades 3-4
- Theme
- The Case of the Slytherin Locket — set in the deep, misty woods of Dean
- Format
- Interactive online & printable worksheet with answer key
- Solution
- One unique, verified culprit among 21 suspects