🔎 One piece, drstone onepunch Grade 4Reading: grades 3-4RoundingAdditionSubtractionMultiplicationDivision
The Digital Stone Mystery
Someone has stolen the ultra-secret Digital Stone Formula from the laboratory! Our hero guild is in complete chaos. We must help our favorite anime champions track down the sneaky thief before they escape the island!
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 Strike | Digital Assist | Stance | Hair Color | Major Weakness |
|---|---|---|---|---|---|
| Mimi | Science Elixir | Crest of Courage | Right Handed Stance | Jet Black Spikes | Deep Ocean Water |
| Tatsumaki | Science Elixir | Science Goggles | Right Handed Stance | Jet Black Spikes | Deep Ocean Water |
| Sanji | Gum Gum Pistol | Straw Hat | Left Handed Stance | Green Spikes | Deep Ocean Water |
| Nami | Digimon Fusion | Straw Hat | Left Handed Stance | Bright Yellow Spikes | Spicy Ghost Peppers |
| Izzy | Serious Punch | Digital Analyzer | Right Handed Stance | Jet Black Spikes | Deep Ocean Water |
| Zoro | Serious Punch | Digital Analyzer | Left Handed Stance | Bright Yellow Spikes | Spicy Ghost Peppers |
| Gen | Digimon Fusion | Straw Hat | Right Handed Stance | Bright Yellow Spikes | Spicy Ghost Peppers |
| Usopp | Science Elixir | Hero Cape | Left Handed Stance | Bright Yellow Spikes | Strong Magnets |
| Saitama | Gum Gum Pistol | Straw Hat | Right Handed Stance | Green Spikes | Spicy Ghost Peppers |
| Fubuki | Fire Fist | Straw Hat | Left Handed Stance | Bright Yellow Spikes | Strong Magnets |
| Suika | Gum Gum Pistol | Hero Cape | Right Handed Stance | Jet Black Spikes | Strong Magnets |
| Joe | Gum Gum Pistol | Crest of Courage | Right Handed Stance | Green Spikes | Deep Ocean Water |
| Bang | Digimon Fusion | Science Goggles | Right Handed Stance | Green Spikes | Deep Ocean Water |
| Chopper | Gum Gum Pistol | Crest of Courage | Right Handed Stance | Green Spikes | Strong Magnets |
| Matt | Gum Gum Pistol | Science Goggles | Left Handed Stance | Jet Black Spikes | Spicy Ghost Peppers |
| Ryusui | Science Elixir | Hero Cape | Left Handed Stance | Jet Black Spikes | Spicy Ghost Peppers |
| Genos | Digimon Fusion | Digital Analyzer | Right Handed Stance | Green Spikes | Deep Ocean Water |
| Luffy | Science Elixir | Science Goggles | Right Handed Stance | Bright Yellow Spikes | Strong Magnets |
| Kohaku | Fire Fist | Straw Hat | Right Handed Stance | Green Spikes | Deep Ocean Water |
| Senku | Gum Gum Pistol | Digital Analyzer | Right Handed Stance | Jet Black Spikes | Deep Ocean Water |
| Chrome | Digimon Fusion | Hero Cape | Right Handed Stance | Green Spikes | Deep Ocean Water |
Clue 1
Rounding
Our digital tracker scanned the villain's escape path! The screen only shows rounded speed numbers. Round these numbers to the nearest ten to unlock 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
20
3700
130
T
20
3700
90
130
5000
1700
50
130
2300
430
50
T
20
3700
200
9000
130
200
1700
90
1300
90
T
20
200
2900
200
430
200
2900
900
290
130
70
Round 18 to the nearest tenT
Round 133 to the nearest tenE
Round 290 to the nearest tenZ
Round 1,708 to the nearest hundredD
Round 4,872 to the nearest thousandF
Round 47 to the nearest tenO
Round 201 to the nearest hundredA
Round 3,675 to the nearest hundredH
Round 2,916 to the nearest hundredL
Round 872 to the nearest hundredY
Round 9,258 to the nearest thousandV
Round 70 to the nearest tenR
Round 429 to the nearest tenN
Round 2,256 to the nearest hundredS
Round 1,299 to the nearest hundredG
Round 89 to the nearest tenI
0/16 letters found
Clue 2
Addition
The team needs to pack extra science elixirs for the chase. Add up all the bottles in our laboratory chests to see what we have and find the second 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.
W
2156
3032
7853
9329
W
2156
9329
5687
3329
3813
6827
2160
6827
9329
5134
5103
5828
5687
3329
5134
2160
5743
5134
2160
6827
3032
W
2156
9329
4151
4151
735 + 1421 =W
1203 + 2610 =G
1964 + 3864 =P
3919 + 1824 =O
2438 + 3249 =R
2410 + 5443 =S
956 + 2076 =E
2209 + 2925 =N
773 + 1387 =T
2328 + 2775 =D
1597 + 2554 =L
4572 + 2255 =H
3874 + 5455 =A
1676 + 1653 =I
0/14 letters found
Clue 3
Subtraction
The rogue hero knocked over several bins of digital energy gears. Subtract the broken gears from the total to clean up the workspace and get 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
3373
3678
1157
3368
8377
3806
6793
4223
1166
3806
4345
2354
3806
T
3373
1157
4345
3368
8322
8810
3806
3368
3678
1157
6232
T
3373
3678
1157
6793
5666
8810
8322
4345
2227
T
3373
8373 - 5000 =T
6172 - 3818 =W
7016 - 223 =C
4173 - 805 =S
5943 - 4777 =B
5627 - 3400 =I
8280 - 2048 =D
2578 - 1421 =E
5613 - 1390 =K
8528 - 2862 =U
12324 - 3947 =N
11986 - 3664 =P
5489 - 1144 =R
11085 - 2275 =L
7462 - 3784 =H
8032 - 4226 =A
0/16 letters found
Clue 4
Multiplication facts (1-12)
We found rows of mysterious digivolving energy crates stacked in the warehouse. Multiply the rows by the columns to count them all and reveal a hair 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.
A
8
5
40
144
12
64
77
12
30
77
77
144
7
A
8
40
30
66
A
8
5
64
77
4
35
60
144
35
7
77
15
77
144
3
7
4 × 2 =A
3 × 5 =B
5 × 1 =S
6 × 11 =W
4 × 3 =G
12 × 12 =N
12 × 5 =O
2 × 2 =F
11 × 7 =E
7 × 5 =T
7 × 1 =H
5 × 8 =I
3 × 10 =R
1 × 3 =C
8 × 8 =L
0/15 letters found
Clue 5
Division facts (1-12) — the last clue
We must share our remaining power snacks equally among the search party. Divide the total snacks by our teammates to power up and get the final clue!
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
70 ÷ 10 = ?
40 ÷ 5 = ?
54 ÷ 6 = ?
110 ÷ 11 = ?
42 ÷ 7 = ?
6 ÷ 2 = ?
15 ÷ 3 = ?
28 ÷ 7 = ?
14 ÷ 7 = ?
12 ÷ 12 = ?
66 ÷ 6 = ?
Step 2 — cross out the sentence with each answer
1.The villain blasts open the reinforced safe with one punch, then rides away on an electric scooter.
2.The villain stretches a long rubbery arm through the vault window, then flies off with a mini jetpack.
3.The villain blasts open the reinforced safe with one punch, then escapes on a tiny yellow raft.
4.The villain brews a sleeping gas potion, then escapes on a tiny yellow raft.
5.The villain brews a sleeping gas potion, then runs down the street at super speed.
6.The villain digivolves to leap over the high walls, then swings through the trees using vines.
7.The villain stretches a long rubbery arm through the vault window, then escapes on a tiny yellow raft.
8.The villain digivolves to leap over the high walls, then flies off with a mini jetpack.
9.The villain creates a fiery distraction in the lobby, then swings through the trees using vines.
10.The villain blasts open the reinforced safe with one punch, then swings through the trees using vines.
11.The villain digivolves to leap over the high walls, then escapes on a tiny yellow raft.
12.The villain digivolves to leap over the high walls, then rides away on an electric scooter.
Solve it
Name the culprit
Choose the one suspect left standing.
Answer Key — The Digital Stone Mystery
Culprit: Bang (Digimon Fusion · Science Goggles · Right Handed Stance · Green Spikes · Deep Ocean Water)
- Clue 1 (Rounding): "THE THIEF DOES NOT HAVE A DIGITAL ANALYZER"Round 18 to the nearest ten = 20 (T) · Round 133 to the nearest ten = 130 (E) · Round 290 to the nearest ten = 290 (Z) · Round 1,708 to the nearest hundred = 1700 (D) · Round 4,872 to the nearest thousand = 5000 (F) · Round 47 to the nearest ten = 50 (O) · Round 201 to the nearest hundred = 200 (A) · Round 3,675 to the nearest hundred = 3700 (H) · Round 2,916 to the nearest hundred = 2900 (L) · Round 872 to the nearest hundred = 900 (Y) · Round 9,258 to the nearest thousand = 9000 (V) · Round 70 to the nearest ten = 70 (R) · Round 429 to the nearest ten = 430 (N) · Round 2,256 to the nearest hundred = 2300 (S) · Round 1,299 to the nearest hundred = 1300 (G) · Round 89 to the nearest ten = 90 (I)
- Clue 2 (Addition): "WE SAW A RIGHT HAND PRINT ON THE WALL"735 + 1421 = 2156 (W) · 1203 + 2610 = 3813 (G) · 1964 + 3864 = 5828 (P) · 3919 + 1824 = 5743 (O) · 2438 + 3249 = 5687 (R) · 2410 + 5443 = 7853 (S) · 956 + 2076 = 3032 (E) · 2209 + 2925 = 5134 (N) · 773 + 1387 = 2160 (T) · 2328 + 2775 = 5103 (D) · 1597 + 2554 = 4151 (L) · 4572 + 2255 = 6827 (H) · 3874 + 5455 = 9329 (A) · 1676 + 1653 = 3329 (I)
- Clue 3 (Subtraction): "THE SNACK BAR WATER SPLASHED THE CULPRIT"8373 - 5000 = 3373 (T) · 6172 - 3818 = 2354 (W) · 7016 - 223 = 6793 (C) · 4173 - 805 = 3368 (S) · 5943 - 4777 = 1166 (B) · 5627 - 3400 = 2227 (I) · 8280 - 2048 = 6232 (D) · 2578 - 1421 = 1157 (E) · 5613 - 1390 = 4223 (K) · 8528 - 2862 = 5666 (U) · 12324 - 3947 = 8377 (N) · 11986 - 3664 = 8322 (P) · 5489 - 1144 = 4345 (R) · 11085 - 2275 = 8810 (L) · 7462 - 3784 = 3678 (H) · 8032 - 4226 = 3806 (A)
- Clue 4 (Multiplication facts (1-12)): "A SINGLE GREEN HAIR WAS LEFT ON THE BENCH"4 × 2 = 8 (A) · 3 × 5 = 15 (B) · 5 × 1 = 5 (S) · 6 × 11 = 66 (W) · 4 × 3 = 12 (G) · 12 × 12 = 144 (N) · 12 × 5 = 60 (O) · 2 × 2 = 4 (F) · 11 × 7 = 77 (E) · 7 × 5 = 35 (T) · 7 × 1 = 7 (H) · 5 × 8 = 40 (I) · 3 × 10 = 30 (R) · 1 × 3 = 3 (C) · 8 × 8 = 64 (L)
- Clue 5 (Division facts (1-12)): surviving statement (box 12) → Bang70 ÷ 10 = 7 · 40 ÷ 5 = 8 · 54 ÷ 6 = 9 · 110 ÷ 11 = 10 · 42 ÷ 7 = 6 · 6 ÷ 2 = 3 · 15 ÷ 3 = 5 · 28 ÷ 7 = 4 · 14 ÷ 7 = 2 · 12 ÷ 12 = 1 · 66 ÷ 6 = 11
About this mystery
- Grade level
- Grade 4 math
- Math topics
- Rounding, Addition, Subtraction, Multiplication, Division
- Reading level
- grades 3-4
- Theme
- The Digital Stone Mystery — set in the Digital Stone Kingdom
- Format
- Interactive online & printable worksheet with answer key
- Solution
- One unique, verified culprit among 21 suspects