Grade 3Reading: grades 3-4RoundingAdditionSubtractionMultiplicationDivision
The Mystery of the Golden Banana
The Golden Banana has disappeared from the Treehouse Camp! The camp leader is shocked. Only the Shadow Sneak could have cracked the ancient jungle vault. Grab your gear, because we have a mystery to solve!
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 | Jungle Tool | Special Badge | Note Writing Hand | Bandana Color | Scares Easily By |
|---|---|---|---|---|---|
| Oliver | Grapevine Whip | Parrot Badge | Left Handed | Green Bandana | Shiny Mirrors |
| Abigail | Explorer Scope | Frog Badge | Left Handed | Red Bandana | Shiny Mirrors |
| Annie | Explorer Scope | Parrot Badge | Left Handed | Red Bandana | Squeaky Toys |
| Quincy | Grapevine Whip | Monkey Badge | Left Handed | Green Bandana | Squeaky Toys |
| Diego | Compass | Monkey Badge | Left Handed | Red Bandana | Squeaky Toys |
| Riley | Compass | Monkey Badge | Right Handed | Red Bandana | Loud Whistles |
| Clara | Mapping Tablet | Snake Badge | Right Handed | Red Bandana | Loud Whistles |
| Arthur | Grapevine Whip | Tiger Badge | Left Handed | Red Bandana | Shiny Mirrors |
| Jack | Rope Launcher | Frog Badge | Right Handed | Green Bandana | Loud Whistles |
| Marcus | Explorer Scope | Tiger Badge | Left Handed | Red Bandana | Shiny Mirrors |
| Penny | Mapping Tablet | Tiger Badge | Left Handed | Red Bandana | Squeaky Toys |
| June | Mapping Tablet | Snake Badge | Left Handed | Red Bandana | Shiny Mirrors |
| Sally | Grapevine Whip | Frog Badge | Left Handed | Red Bandana | Shiny Mirrors |
| Mae | Rope Launcher | Parrot Badge | Left Handed | Red Bandana | Loud Whistles |
| Toby | Grapevine Whip | Parrot Badge | Right Handed | Red Bandana | Shiny Mirrors |
| Leo | Rope Launcher | Tiger Badge | Left Handed | Green Bandana | Squeaky Toys |
| Lara | Grapevine Whip | Tiger Badge | Right Handed | Red Bandana | Loud Whistles |
| Sydney | Grapevine Whip | Tiger Badge | Right Handed | Green Bandana | Shiny Mirrors |
| Ben | Explorer Scope | Snake Badge | Left Handed | Green Bandana | Loud Whistles |
| Dora | Grapevine Whip | Snake Badge | Right Handed | Green Bandana | Loud Whistles |
| Jane | Grapevine Whip | Tiger Badge | Left Handed | Blue Bandana | Loud Whistles |
Clue 1
Rounding
A blurry tracking map only shows rounded distances to the nearest ten yards. Help the Treehouse Club estimate where the thief ran.
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
70
2000
3000
T
70
2000
8000
3000
9000
4000
6000
3000
600
800
6000
T
70
300
3000
40
400
T
70
2000
3000
600
800
40
50
3000
80
40
4000
900
3000
Round 68 to the nearest tenT
Round 51 to the nearest tenK
Round 319 to the nearest hundredW
Round 1,877 to the nearest thousandH
Round 78 to the nearest tenB
Round 647 to the nearest hundredS
Round 433 to the nearest hundredR
Round 4,479 to the nearest thousandD
Round 6,114 to the nearest thousandO
Round 8,245 to the nearest thousandI
Round 8,683 to the nearest thousandF
Round 2,783 to the nearest thousandE
Round 794 to the nearest hundredN
Round 861 to the nearest hundredG
Round 43 to the nearest tenA
0/15 letters found
Clue 2
Addition
We found a pile of dropped supplies! Count the total number of items to see what else might be missing.
Solve each problem to learn its letter. Then write that letter in every box that shows the same number, and read the secret clue.
L
363
355
319
981
562
340
512
891
355
891
319
436
436
981
880
817
678
512
981
502
584
312
981
562
355
817
293
678
512
502
236 + 127 =L
190 + 165 =E
223 + 117 =A
422 + 469 =D
236 + 200 =O
218 + 101 =F
122 + 190 =Y
304 + 576 =P
203 + 299 =S
355 + 207 =H
188 + 396 =B
452 + 226 =I
527 + 290 =R
623 + 358 =T
187 + 106 =U
160 + 352 =N
0/16 letters found
Clue 3
Subtraction
The camp supply chest was raided. Work out how many juice boxes were taken from the pile.
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
546
895
166
T
546
895
160
166
872
400
895
745
124
452
518
872
745
626
273
783
400
895
160
452
366
273
160
745
745
626
745
908 - 362 =T
838 - 320 =K
646 - 246 =S
837 - 385 =N
933 - 61 =F
1065 - 320 =R
565 - 199 =Y
292 - 19 =M
291 - 125 =E
875 - 92 =A
334 - 210 =U
1122 - 227 =H
490 - 330 =I
1013 - 387 =O
0/14 letters found
Clue 4
Multiplication facts (1-12)
The path ahead is blocked by rows of ancient stepping stones. Multiply the rows to find the safe path.
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
72
64
20
8
144
21
54
90
66
15
64
81
54
99
8
20
81
15
64
54
40
81
21
54
81
21
81
6 × 12 =W
10 × 9 =T
4 × 5 =F
6 × 11 =H
7 × 3 =N
4 × 2 =O
9 × 9 =A
9 × 6 =D
12 × 12 =U
8 × 8 =E
8 × 5 =B
9 × 11 =S
5 × 3 =R
0/13 letters found
Clue 5
Division facts (1-12) — the last clue
We found a bag of glowing trail markers. Divide them evenly among the team members to light our way.
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
11 ÷ 11 = ?
63 ÷ 7 = ?
60 ÷ 10 = ?
30 ÷ 3 = ?
77 ÷ 7 = ?
20 ÷ 10 = ?
32 ÷ 8 = ?
10 ÷ 2 = ?
132 ÷ 11 = ?
88 ÷ 11 = ?
77 ÷ 11 = ?
Step 2 — cross out the sentence with each answer
1.The villain scouted the camp with an explorer scope, then shuffled away while wearing a tiger badge.
2.The villain swung across the canyon with a grapevine whip, then slithered through the brush wearing a snake badge.
3.The villain swung across the canyon with a grapevine whip, then shuffled away while wearing a tiger badge.
4.The villain zoomed through the trees using a rope launcher, then dashed past the tents wearing a parrot badge.
5.The villain tracked the path with a mapping tablet, then hopped over the logs wearing a monkey badge.
6.The villain scouted the camp with an explorer scope, then leaped over the puddle wearing a frog badge.
7.The villain tracked the path with a mapping tablet, then slithered through the brush wearing a snake badge.
8.The villain swung across the canyon with a grapevine whip, then dashed past the tents wearing a parrot badge.
9.The villain swung across the canyon with a grapevine whip, then leaped over the puddle wearing a frog badge.
10.The villain zoomed through the trees using a rope launcher, then hopped over the logs wearing a monkey badge.
11.The villain found the secret door with a compass, then hopped over the logs wearing a monkey badge.
12.The villain swung across the canyon with a grapevine whip, then hopped over the logs wearing a monkey badge.
Solve it
Name the culprit
Choose the one suspect left standing.
Answer Key — The Mystery of the Golden Banana
Culprit: Arthur (Grapevine Whip · Tiger Badge · Left Handed · Red Bandana · Shiny Mirrors)
- Clue 1 (Rounding): "THE THIEF DOES NOT WEAR THE SNAKE BADGE"Round 68 to the nearest ten = 70 (T) · Round 51 to the nearest ten = 50 (K) · Round 319 to the nearest hundred = 300 (W) · Round 1,877 to the nearest thousand = 2000 (H) · Round 78 to the nearest ten = 80 (B) · Round 647 to the nearest hundred = 600 (S) · Round 433 to the nearest hundred = 400 (R) · Round 4,479 to the nearest thousand = 4000 (D) · Round 6,114 to the nearest thousand = 6000 (O) · Round 8,245 to the nearest thousand = 8000 (I) · Round 8,683 to the nearest thousand = 9000 (F) · Round 2,783 to the nearest thousand = 3000 (E) · Round 794 to the nearest hundred = 800 (N) · Round 861 to the nearest hundred = 900 (G) · Round 43 to the nearest ten = 40 (A)
- Clue 2 (Addition): "LEFT HANDED FOOTPRINTS BY THE RUINS"236 + 127 = 363 (L) · 190 + 165 = 355 (E) · 223 + 117 = 340 (A) · 422 + 469 = 891 (D) · 236 + 200 = 436 (O) · 218 + 101 = 319 (F) · 122 + 190 = 312 (Y) · 304 + 576 = 880 (P) · 203 + 299 = 502 (S) · 355 + 207 = 562 (H) · 188 + 396 = 584 (B) · 452 + 226 = 678 (I) · 527 + 290 = 817 (R) · 623 + 358 = 981 (T) · 187 + 106 = 293 (U) · 160 + 352 = 512 (N)
- Clue 3 (Subtraction): "THE THIEF SHRUNK FROM A SHINY MIRROR"908 - 362 = 546 (T) · 838 - 320 = 518 (K) · 646 - 246 = 400 (S) · 837 - 385 = 452 (N) · 933 - 61 = 872 (F) · 1065 - 320 = 745 (R) · 565 - 199 = 366 (Y) · 292 - 19 = 273 (M) · 291 - 125 = 166 (E) · 875 - 92 = 783 (A) · 334 - 210 = 124 (U) · 1122 - 227 = 895 (H) · 490 - 330 = 160 (I) · 1013 - 387 = 626 (O)
- Clue 4 (Multiplication facts (1-12)): "WE FOUND THREADS OF A RED BANDANA"6 × 12 = 72 (W) · 10 × 9 = 90 (T) · 4 × 5 = 20 (F) · 6 × 11 = 66 (H) · 7 × 3 = 21 (N) · 4 × 2 = 8 (O) · 9 × 9 = 81 (A) · 9 × 6 = 54 (D) · 12 × 12 = 144 (U) · 8 × 8 = 64 (E) · 8 × 5 = 40 (B) · 9 × 11 = 99 (S) · 5 × 3 = 15 (R)
- Clue 5 (Division facts (1-12)): surviving statement (box 3) → Arthur11 ÷ 11 = 1 · 63 ÷ 7 = 9 · 60 ÷ 10 = 6 · 30 ÷ 3 = 10 · 77 ÷ 7 = 11 · 20 ÷ 10 = 2 · 32 ÷ 8 = 4 · 10 ÷ 2 = 5 · 132 ÷ 11 = 12 · 88 ÷ 11 = 8 · 77 ÷ 11 = 7
About this mystery
- Grade level
- Grade 3 math
- Math topics
- Rounding, Addition, Subtraction, Multiplication, Division
- Reading level
- grades 3-4
- Theme
- The Mystery of the Golden Banana — set in The Whispering Leaf Jungle
- Format
- Interactive online & printable worksheet with answer key
- Solution
- One unique, verified culprit among 21 suspects