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Grade 4Reading: grades 1-2MultiplicationAdditionRoundingSubtractionDivision

The Golden Pineapple Mystery

Oh no! Someone took the Golden Pineapple from the Island Chief. We need to find the rogue explorer who did it before the big island feast!

Suspects

Possible suspects

Cross off a row as each clue rules it out. On screen, tap a row.

21 of 21 still in play
NameExplorer ToolIsland BadgeWriting HandCap ColorSilly Fear
RoyPocket BinocularsSun BadgeRight-handedBlue CapScared of Mud
RexSpy CameraTree BadgeRight-handedGreen CapScared of Mud
JoySuper CompassSun BadgeLeft-handedRed CapScared of Frogs
AmyPocket BinocularsCloud BadgeRight-handedGreen CapScared of Bugs
JackSuper CompassCloud BadgeRight-handedBlue CapScared of Bugs
MaxSpy CameraShell BadgeLeft-handedBlue CapScared of Mud
LukeLaser FlashlightShell BadgeRight-handedGreen CapScared of Mud
ZoeSuper CompassTree BadgeLeft-handedRed CapScared of Frogs
RubySuper CompassShell BadgeRight-handedGreen CapScared of Mud
FinnLaser FlashlightSun BadgeRight-handedRed CapScared of Bugs
LilySuper CompassTree BadgeLeft-handedGreen CapScared of Mud
OtisSpy CameraCloud BadgeLeft-handedRed CapScared of Bugs
SamSuper CompassWave BadgeRight-handedGreen CapScared of Mud
TobyGrappling HookShell BadgeLeft-handedRed CapScared of Frogs
CoraSuper CompassShell BadgeRight-handedBlue CapScared of Bugs
RoseLaser FlashlightWave BadgeLeft-handedRed CapScared of Bugs
BenSuper CompassTree BadgeRight-handedRed CapScared of Frogs
HugoLaser FlashlightTree BadgeRight-handedBlue CapScared of Mud
EliPocket BinocularsCloud BadgeRight-handedRed CapScared of Frogs
EmmaGrappling HookShell BadgeRight-handedGreen CapScared of Mud
LeoGrappling HookTree BadgeRight-handedGreen CapScared of Bugs
Clue 1

Multiplication facts (1-12)

We find a box of secret gears. They are in neat rows. We count the rows to see how many gears are inside.

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
72
14
42
81
108
48
48
77
108
66
10
40
42
21
66
40
T
72
14
77
81
42
T
72
14
42
63
77
81
42
88
77
10
121
42
6 × 12 =T
6 × 7 =E
6 × 8 =L
2 × 7 =H
7 × 11 =A
9 × 9 =V
1 × 10 =D
9 × 7 =W
11 × 11 =G
3 × 7 =S
9 × 12 =I
8 × 11 =B
6 × 11 =N
10 × 4 =O
0/14 letters found
Clue 2

Addition

We need to pack our supply bags. We count the apples and bananas. We add them up to find the total.

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
6716
7829
7386
9488
8152
T
6716
7386
5007
9443
7386
5121
7386
9443
5121
6020
T
6716
T
6716
7386
9488
9443
6020
T
6716
7829
T
6716
7829
7386
5121
6020
5089
7829
T
6716
7829
6368
9488
3660
2124 + 4592 =T
2747 + 2374 =R
2995 + 2094 =G
5027 + 4461 =N
4506 + 3646 =O
3494 + 2874 =A
2317 + 2690 =S
2275 + 3745 =I
5136 + 2250 =E
1197 + 2463 =D
6221 + 3222 =W
3901 + 3928 =H
0/12 letters found
Clue 3

Rounding

Our spy radar screen is blurry. It only shows rounded numbers. We must round the distance to read it.

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
5000
70
370
1300
170
700
700
20
170
110
900
20
110
20
430
20
2900
T
5000
1700
30
370
370
290
20
430
20
2900
90
900
1700
50
50
7000
2300
Round 4,922 to the nearest thousandT
Round 47 to the nearest tenM
Round 1,714 to the nearest hundredO
Round 23 to the nearest tenA
Round 430 to the nearest tenW
Round 107 to the nearest tenN
Round 290 to the nearest tenP
Round 366 to the nearest tenE
Round 936 to the nearest hundredR
Round 6,774 to the nearest thousandU
Round 2,318 to the nearest hundredD
Round 30 to the nearest tenK
Round 676 to the nearest hundredL
Round 2,912 to the nearest hundredY
Round 89 to the nearest tenF
Round 1,293 to the nearest hundredV
Round 170 to the nearest tenI
Round 70 to the nearest tenH
0/18 letters found
Clue 4

Subtraction

We had many juice boxes. We drank some on the trail. We subtract to see how many juice boxes are 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.

A
6986
7662
8091
1081
1081
6334
8530
A
6986
4403
1176
8091
8133
5372
1183
8530
8091
A
6986
4403
1081
5957
2973
3373
1081
1714
1637
1838
8530
1081
8133
1714
8133
6334
7662
7245 - 259 =A
8335 - 2963 =M
8346 - 255 =R
5439 - 3802 =O
4672 - 269 =P
9010 - 1348 =G
6683 - 349 =N
3306 - 1468 =W
4404 - 1031 =H
6419 - 462 =D
2697 - 1521 =B
12923 - 4393 =C
5883 - 4802 =E
2701 - 1518 =S
3886 - 2172 =L
8681 - 548 =I
3369 - 396 =T
0/17 letters found
Clue 5

Division facts (1-12) — the last clue

We found some shiny gold coins. We share them equally among our team. We divide them to find each share.

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
21 ÷ 3 = ?
88 ÷ 8 = ?
99 ÷ 11 = ?
48 ÷ 4 = ?
2 ÷ 1 = ?
66 ÷ 11 = ?
20 ÷ 4 = ?
20 ÷ 2 = ?
11 ÷ 11 = ?
12 ÷ 3 = ?
88 ÷ 11 = ?
Step 2 — cross out the sentence with each answer
1.The villain shined the laser flashlight in the dark, then showed off the silver cloud badge.
2.The villain snapped a photo with the spy camera, then showed off the silver cloud badge.
3.The villain used the super compass to find the path, then tapped the small shell badge.
4.The villain snapped a photo with the spy camera, then tapped the small shell badge.
5.The villain used the super compass to find the path, then showed off the silver cloud badge.
6.The villain shined the laser flashlight in the dark, then dropped the wet wave badge.
7.The villain shined the laser flashlight in the dark, then tapped the small shell badge.
8.The villain swung up high with the grappling hook, then showed off the silver cloud badge.
9.The villain swung up high with the grappling hook, then tapped the small shell badge.
10.The villain shined the laser flashlight in the dark, then polished the green tree badge.
11.The villain snapped a photo with the spy camera, then polished the green tree badge.
12.The villain spotted the target with the pocket binoculars, then dropped the wet wave badge.
Solve it

Name the culprit

Choose the one suspect left standing.

Answer Key — The Golden Pineapple Mystery

Culprit: Ruby (Super Compass · Shell Badge · Right-handed · Green Cap · Scared of Mud)
  1. Clue 1 (Multiplication facts (1-12)): "THE VILLAIN DOES NOT HAVE THE WAVE BADGE"
    6 × 12 = 72 (T) · 6 × 7 = 42 (E) · 6 × 8 = 48 (L) · 2 × 7 = 14 (H) · 7 × 11 = 77 (A) · 9 × 9 = 81 (V) · 1 × 10 = 10 (D) · 9 × 7 = 63 (W) · 11 × 11 = 121 (G) · 3 × 7 = 21 (S) · 9 × 12 = 108 (I) · 8 × 11 = 88 (B) · 6 × 11 = 66 (N) · 10 × 4 = 40 (O)
  2. Clue 2 (Addition): "THE NOTES WERE WRITTEN WITH THE RIGHT HAND"
    2124 + 4592 = 6716 (T) · 2747 + 2374 = 5121 (R) · 2995 + 2094 = 5089 (G) · 5027 + 4461 = 9488 (N) · 4506 + 3646 = 8152 (O) · 3494 + 2874 = 6368 (A) · 2317 + 2690 = 5007 (S) · 2275 + 3745 = 6020 (I) · 5136 + 2250 = 7386 (E) · 1197 + 2463 = 3660 (D) · 6221 + 3222 = 9443 (W) · 3901 + 3928 = 7829 (H)
  3. Clue 3 (Rounding): "THE VILLAIN RAN AWAY TO KEEP AWAY FROM MUD"
    Round 4,922 to the nearest thousand = 5000 (T) · Round 47 to the nearest ten = 50 (M) · Round 1,714 to the nearest hundred = 1700 (O) · Round 23 to the nearest ten = 20 (A) · Round 430 to the nearest ten = 430 (W) · Round 107 to the nearest ten = 110 (N) · Round 290 to the nearest ten = 290 (P) · Round 366 to the nearest ten = 370 (E) · Round 936 to the nearest hundred = 900 (R) · Round 6,774 to the nearest thousand = 7000 (U) · Round 2,318 to the nearest hundred = 2300 (D) · Round 30 to the nearest ten = 30 (K) · Round 676 to the nearest hundred = 700 (L) · Round 2,912 to the nearest hundred = 2900 (Y) · Round 89 to the nearest ten = 90 (F) · Round 1,293 to the nearest hundred = 1300 (V) · Round 170 to the nearest ten = 170 (I) · Round 70 to the nearest ten = 70 (H)
  4. Clue 4 (Subtraction): "A GREEN CAP BRIM SCRAPED THE LOW CEILING"
    7245 - 259 = 6986 (A) · 8335 - 2963 = 5372 (M) · 8346 - 255 = 8091 (R) · 5439 - 3802 = 1637 (O) · 4672 - 269 = 4403 (P) · 9010 - 1348 = 7662 (G) · 6683 - 349 = 6334 (N) · 3306 - 1468 = 1838 (W) · 4404 - 1031 = 3373 (H) · 6419 - 462 = 5957 (D) · 2697 - 1521 = 1176 (B) · 12923 - 4393 = 8530 (C) · 5883 - 4802 = 1081 (E) · 2701 - 1518 = 1183 (S) · 3886 - 2172 = 1714 (L) · 8681 - 548 = 8133 (I) · 3369 - 396 = 2973 (T)
  5. Clue 5 (Division facts (1-12)): surviving statement (box 3) → Ruby
    21 ÷ 3 = 7 · 88 ÷ 8 = 11 · 99 ÷ 11 = 9 · 48 ÷ 4 = 12 · 2 ÷ 1 = 2 · 66 ÷ 11 = 6 · 20 ÷ 4 = 5 · 20 ÷ 2 = 10 · 11 ÷ 11 = 1 · 12 ÷ 3 = 4 · 88 ÷ 11 = 8

About this mystery

Grade level
Grade 4 math
Math topics
Multiplication, Addition, Rounding, Subtraction, Division
Reading level
grades 1-2
Theme
The Golden Pineapple Mystery — set in Banana Leaf Island
Format
Interactive online & printable worksheet with answer key
Solution
One unique, verified culprit among 21 suspects

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