🔎 Kpop Demon huntersGrade 2Reading: grades 1-2Place valueAdditionSubtractionSkip countingMissing addends
The Backstage Beatdown
A sneaky shadow demon took the golden microphone right before the big show! The music cannot start without it. Our demon hunter squad must scan the backstage area and find out which idol is really the monster in disguise.
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 | Signature Move | Stage Gear | Stage Habit | Hair Color | Music Weakness |
|---|---|---|---|---|---|
| Lisa | laser wink | neon mic | holds mic right | bright green | cute songs |
| Taemin | bass drop | star ring | holds mic right | bright green | high notes |
| Hyunjin | high kick | led jacket | holds mic left | icy blue | drum beats |
| Jimin | vocal blast | led jacket | holds mic left | icy blue | high notes |
| Baekhyun | vocal blast | led jacket | holds mic right | bright green | high notes |
| Bang Chan | dance spin | neon mic | holds mic left | bright green | cute songs |
| Felix | vocal blast | star ring | holds mic left | bright green | cute songs |
| Jin | laser wink | neon mic | holds mic left | bright green | high notes |
| J-Hope | laser wink | led jacket | holds mic left | bright green | cute songs |
| Momo | dance spin | neon mic | holds mic left | bright green | drum beats |
| RM | high kick | star ring | holds mic right | neon pink | drum beats |
| V | bass drop | neon mic | holds mic left | bright green | drum beats |
| Ryujin | laser wink | glow wand | holds mic left | icy blue | cute songs |
| Sana | bass drop | led jacket | holds mic left | neon pink | cute songs |
| Yeji | vocal blast | glow wand | holds mic left | neon pink | drum beats |
| Winter | dance spin | silver boots | holds mic left | icy blue | cute songs |
| Kai | high kick | led jacket | holds mic left | neon pink | cute songs |
| Tzuyu | dance spin | silver boots | holds mic left | bright green | drum beats |
| Jennie | high kick | silver boots | holds mic left | bright green | cute songs |
| Jisoo | dance spin | led jacket | holds mic right | bright green | drum beats |
| Karina | bass drop | led jacket | holds mic left | bright green | cute songs |
Clue 1
Place value
We check the glowing digital scoreboard backstage. The tens and ones show us a hint about the demon's extra gear.
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
96
83
61
83
78
85
14
61
85
83
82
14
85
T
23
66
83
91
86
91
82
T
23
91
86
86
16
14
75
What number has 2 tens and 3 ones?T
What number has 8 tens and 6 ones?R
What number has 7 tens and 5 ones?G
What number has 9 tens and 1 one?A
What number has 1 ten and 4 ones?N
What number has 6 tens and 1 one?D
What number has 9 tens and 6 ones?H
What number has 6 tens and 6 ones?W
What number has 1 ten and 6 ones?I
What number has 8 tens and 2 ones?S
What number has 8 tens and 5 ones?O
What number has 7 tens and 8 ones?M
What number has 8 tens and 3 ones?E
0/13 letters found
Clue 2
Addition
Let us count all the sparkly stage outfits in the closets. Adding them up gives us a clue about the demon's stage habit.
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
46
64
41
26
66
26
75
41
36
T
46
64
60
67
96
26
T
46
64
41
48
72
36
72
74
T
46
64
41
67
41
43
T
46
64
45
74
96
26 + 20 =T
22 + 50 =I
27 + 16 =F
27 + 33 =O
24 + 43 =L
62 + 34 =D
51 + 24 =P
25 + 20 =A
23 + 51 =N
29 + 12 =E
20 + 28 =M
29 + 37 =U
7 + 19 =S
35 + 29 =H
20 + 16 =C
0/15 letters found
Clue 3
Subtraction
The band had lots of glow sticks but the demon broke some. Subtract the broken ones to find what music the demon hates.
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
53
21
14
32
38
33
55
81
14
41
28
43
72
66
26
76
76
36
26
12
12
38
81
44
14
27
28
43
41
81
14
32
73 - 20 =A
57 - 24 =C
103 - 37 =W
39 - 11 =O
59 - 15 =H
30 - 4 =I
93 - 38 =U
43 - 7 =D
69 - 31 =Y
80 - 8 =G
83 - 7 =L
44 - 30 =E
70 - 29 =S
44 - 32 =Z
56 - 35 =V
60 - 28 =R
59 - 16 =N
47 - 20 =M
103 - 22 =T
0/19 letters found
Clue 4
Skip counting
We follow the neon footprints down the dark hallway. We count them by twos to see where the demon dropped some hair.
Solve each problem to learn its letter. Then write that letter in every box that shows the same number, and read the secret clue.
B
9
36
22
21
90
25
21
36
39
39
18
70
25
36
140
18
16
70
40
39
36
39
28
39
100
25
120
18
25
90
39
70
25
140
21
39
Skip-count by 3s. Fill the blank: 3, 6, ___, 12, 15B
Skip-count by 10s. Fill the blank: 10, 20, 30, ___, 50, 60W
Skip-count by 10s. Fill the blank: 10, 20, 30, 40, 50, 60, 70, 80, ___, 100, 110H
Skip-count by 10s. Fill the blank: 10, 20, 30, 40, 50, 60, 70, 80, 90, 100, 110, 120, 130, ___, 150, 160A
Skip-count by 3s. Fill the blank: 3, 6, 9, 12, 15, 18, 21, 24, 27, 30, 33, ___, 39, 42R
Skip-count by 2s. Fill the blank: 2, 4, 6, 8, 10, 12, 14, ___, 18, 20D
Skip-count by 3s. Fill the blank: 3, 6, 9, 12, 15, 18, 21, 24, 27, 30, 33, 36, ___, 42, 45E
Skip-count by 5s. Fill the blank: 5, 10, 15, 20, ___, 30, 35T
Skip-count by 10s. Fill the blank: 10, 20, 30, 40, 50, 60, 70, 80, 90, ___, 110, 120F
Skip-count by 10s. Fill the blank: 10, 20, 30, 40, 50, 60, 70, 80, 90, 100, 110, ___, 130, 140O
Skip-count by 2s. Fill the blank: 2, 4, 6, 8, 10, 12, 14, 16, 18, 20, ___, 24, 26I
Skip-count by 10s. Fill the blank: 10, 20, 30, 40, 50, 60, ___, 80, 90S
Skip-count by 3s. Fill the blank: 3, 6, 9, 12, 15, ___, 21, 24N
Skip-count by 2s. Fill the blank: 2, 4, 6, 8, 10, 12, 14, 16, 18, 20, 22, 24, 26, ___, 30, 32L
Skip-count by 3s. Fill the blank: 3, 6, 9, 12, 15, 18, ___, 24, 27G
0/15 letters found
Clue 5
Missing addends — the last clue
The backup dancers need matching shoes. We have some but need more. Finding the missing number tells us how the demon moves.
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
1 + ___ = 11
6 + ___ = 14
9 + ___ = 18
8 + ___ = 12
2 + ___ = 3
1 + ___ = 12
9 + ___ = 11
10 + ___ = 16
5 + ___ = 10
10 + ___ = 17
5 + ___ = 8
Step 2 — cross out the sentence with each answer
1.The villain whirls in a fast dance spin, then stomps in shiny silver boots.
2.The villain leaps with a high kick, then spins a sparkling star ring.
3.The villain whirls in a fast dance spin, then lights up an led jacket.
4.The villain whirls in a fast dance spin, then spins a sparkling star ring.
5.The villain leaps with a high kick, then lights up an led jacket.
6.The villain leaps with a high kick, then waves a magic glow wand.
7.The villain flashes a laser wink, then waves a magic glow wand.
8.The villain flashes a laser wink, then lights up an led jacket.
9.The villain leaps with a high kick, then stomps in shiny silver boots.
10.The villain drops a heavy bass beat, then lights up an led jacket.
11.The villain drops a heavy bass beat, then swings a glowing neon mic.
12.The villain whirls in a fast dance spin, then swings a glowing neon mic.
Solve it
Name the culprit
Choose the one suspect left standing.
Answer Key — The Backstage Beatdown
Culprit: Bang Chan (dance spin · neon mic · holds mic left · bright green · cute songs)
- Clue 1 (Place value): "THE DEMON DOES NOT WEAR A STAR RING"What number has 2 tens and 3 ones? = 23 (T) · What number has 8 tens and 6 ones? = 86 (R) · What number has 7 tens and 5 ones? = 75 (G) · What number has 9 tens and 1 one? = 91 (A) · What number has 1 ten and 4 ones? = 14 (N) · What number has 6 tens and 1 one? = 61 (D) · What number has 9 tens and 6 ones? = 96 (H) · What number has 6 tens and 6 ones? = 66 (W) · What number has 1 ten and 6 ones? = 16 (I) · What number has 8 tens and 2 ones? = 82 (S) · What number has 8 tens and 5 ones? = 85 (O) · What number has 7 tens and 8 ones? = 78 (M) · What number has 8 tens and 3 ones? = 83 (E)
- Clue 2 (Addition): "THE SUSPECT HOLDS THE MIC IN THE LEFT HAND"26 + 20 = 46 (T) · 22 + 50 = 72 (I) · 27 + 16 = 43 (F) · 27 + 33 = 60 (O) · 24 + 43 = 67 (L) · 62 + 34 = 96 (D) · 51 + 24 = 75 (P) · 25 + 20 = 45 (A) · 23 + 51 = 74 (N) · 29 + 12 = 41 (E) · 20 + 28 = 48 (M) · 29 + 37 = 66 (U) · 7 + 19 = 26 (S) · 35 + 29 = 64 (H) · 20 + 16 = 36 (C)
- Clue 3 (Subtraction): "A VERY CUTE SONG WILL DIZZY THE MONSTER"73 - 20 = 53 (A) · 57 - 24 = 33 (C) · 103 - 37 = 66 (W) · 39 - 11 = 28 (O) · 59 - 15 = 44 (H) · 30 - 4 = 26 (I) · 93 - 38 = 55 (U) · 43 - 7 = 36 (D) · 69 - 31 = 38 (Y) · 80 - 8 = 72 (G) · 83 - 7 = 76 (L) · 44 - 30 = 14 (E) · 70 - 29 = 41 (S) · 44 - 32 = 12 (Z) · 56 - 35 = 21 (V) · 60 - 28 = 32 (R) · 59 - 16 = 43 (N) · 47 - 20 = 27 (M) · 103 - 22 = 81 (T)
- Clue 4 (Skip counting): "BRIGHT GREEN STRANDS WERE LEFT ON THE STAGE"Skip-count by 3s. Fill the blank: 3, 6, ___, 12, 15 = 9 (B) · Skip-count by 10s. Fill the blank: 10, 20, 30, ___, 50, 60 = 40 (W) · Skip-count by 10s. Fill the blank: 10, 20, 30, 40, 50, 60, 70, 80, ___, 100, 110 = 90 (H) · Skip-count by 10s. Fill the blank: 10, 20, 30, 40, 50, 60, 70, 80, 90, 100, 110, 120, 130, ___, 150, 160 = 140 (A) · Skip-count by 3s. Fill the blank: 3, 6, 9, 12, 15, 18, 21, 24, 27, 30, 33, ___, 39, 42 = 36 (R) · Skip-count by 2s. Fill the blank: 2, 4, 6, 8, 10, 12, 14, ___, 18, 20 = 16 (D) · Skip-count by 3s. Fill the blank: 3, 6, 9, 12, 15, 18, 21, 24, 27, 30, 33, 36, ___, 42, 45 = 39 (E) · Skip-count by 5s. Fill the blank: 5, 10, 15, 20, ___, 30, 35 = 25 (T) · Skip-count by 10s. Fill the blank: 10, 20, 30, 40, 50, 60, 70, 80, 90, ___, 110, 120 = 100 (F) · Skip-count by 10s. Fill the blank: 10, 20, 30, 40, 50, 60, 70, 80, 90, 100, 110, ___, 130, 140 = 120 (O) · Skip-count by 2s. Fill the blank: 2, 4, 6, 8, 10, 12, 14, 16, 18, 20, ___, 24, 26 = 22 (I) · Skip-count by 10s. Fill the blank: 10, 20, 30, 40, 50, 60, ___, 80, 90 = 70 (S) · Skip-count by 3s. Fill the blank: 3, 6, 9, 12, 15, ___, 21, 24 = 18 (N) · Skip-count by 2s. Fill the blank: 2, 4, 6, 8, 10, 12, 14, 16, 18, 20, 22, 24, 26, ___, 30, 32 = 28 (L) · Skip-count by 3s. Fill the blank: 3, 6, 9, 12, 15, 18, ___, 24, 27 = 21 (G)
- Clue 5 (Missing addends): surviving statement (box 12) → Bang Chan1 + ___ = 11 = 10 · 6 + ___ = 14 = 8 · 9 + ___ = 18 = 9 · 8 + ___ = 12 = 4 · 2 + ___ = 3 = 1 · 1 + ___ = 12 = 11 · 9 + ___ = 11 = 2 · 10 + ___ = 16 = 6 · 5 + ___ = 10 = 5 · 10 + ___ = 17 = 7 · 5 + ___ = 8 = 3
About this mystery
- Grade level
- Grade 2 math
- Math topics
- Place value, Addition, Subtraction, Skip counting, Missing addends
- Reading level
- grades 1-2
- Theme
- The Backstage Beatdown — set in Neo-Seoul Music Arena
- Format
- Interactive online & printable worksheet with answer key
- Solution
- One unique, verified culprit among 21 suspects