Grade 4Reading: grades 3-4RoundingWord problemsAdditionSubtractionDivision
The Mystery of the Crystal Map
A sneaky rival explorer broke into the jungle temple ruins and snatched the ancient crystal map! Use your detective skills and solve math puzzles to narrow down the suspect pool and recover the stolen artifact.
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 | Main Tool | Secondary Gadget | Dominant Hand | Hair Color | Biggest Fear |
|---|---|---|---|---|---|
| Aria | Pocket Drone | Sonar Whistle | Left Handed | Bright Red Hair | Fear Of Spiders |
| Mason | Pocket Drone | Sonar Whistle | Left Handed | Bright Red Hair | Fear Of Bats |
| Kai | Pocket Drone | Zip Line Wheel | Right Handed | Neon Blue Hair | Fear Of Spiders |
| Ruby | Decoder Ring | Zip Line Wheel | Right Handed | Golden Blonde Hair | Fear Of Bats |
| Amelia | Decoder Ring | Zip Line Wheel | Right Handed | Neon Blue Hair | Fear Of Spiders |
| Ivy | Pocket Drone | Zip Line Wheel | Left Handed | Neon Blue Hair | Fear Of Bats |
| Elena | Grappling Hook | Climbing Boots | Right Handed | Neon Blue Hair | Fear Of Spiders |
| Maya | Grappling Hook | Sonar Whistle | Left Handed | Neon Blue Hair | Fear Of Snakes |
| Ella | Grappling Hook | Sonar Whistle | Right Handed | Bright Red Hair | Fear Of Bats |
| Logan | Decoder Ring | Smoke Pellets | Right Handed | Neon Blue Hair | Fear Of Snakes |
| Noah | Radar Compass | Glider Pack | Right Handed | Golden Blonde Hair | Fear Of Bats |
| Lucas | Radar Compass | Sonar Whistle | Right Handed | Neon Blue Hair | Fear Of Spiders |
| Jack | Pocket Drone | Smoke Pellets | Right Handed | Bright Red Hair | Fear Of Bats |
| Owen | Decoder Ring | Glider Pack | Right Handed | Bright Red Hair | Fear Of Spiders |
| Mia | Decoder Ring | Glider Pack | Left Handed | Bright Red Hair | Fear Of Spiders |
| Ethan | Decoder Ring | Sonar Whistle | Left Handed | Neon Blue Hair | Fear Of Spiders |
| Wyatt | Grappling Hook | Glider Pack | Left Handed | Neon Blue Hair | Fear Of Bats |
| Zoe | Radar Compass | Zip Line Wheel | Right Handed | Golden Blonde Hair | Fear Of Bats |
| Nora | Decoder Ring | Sonar Whistle | Right Handed | Neon Blue Hair | Fear Of Spiders |
| Caleb | Decoder Ring | Climbing Boots | Left Handed | Bright Red Hair | Fear Of Bats |
| Chloe | Pocket Drone | Smoke Pellets | Left Handed | Golden Blonde Hair | Fear Of Spiders |
Clue 1
Rounding
You review the daily camp supplies tally to track down where the rival explorer went next.
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
500
290
1300
70
430
50
50
4300
430
230
170
300
1300
130
230
300
T
500
1700
130
1300
700
50
430
3700
3000
430
230
7000
3000
300
300
T
500
130
Round 453 to the nearest hundredT
Round 167 to the nearest tenD
Round 47 to the nearest tenL
Round 3,742 to the nearest hundredM
Round 434 to the nearest tenI
Round 4,303 to the nearest hundredA
Round 293 to the nearest tenH
Round 233 to the nearest tenN
Round 134 to the nearest tenS
Round 7,217 to the nearest thousandG
Round 675 to the nearest hundredC
Round 1,325 to the nearest hundredE
Round 70 to the nearest tenV
Round 3,337 to the nearest thousandB
Round 254 to the nearest hundredO
Round 1,715 to the nearest hundredU
0/16 letters found
Clue 2
Word problems
The altar scanner only shows rounded power readings, but it points to a clue.
Solve each problem to learn its letter, then write the letters in the boxes to fill in the missing word.
Awitnesssawthevillainwas .
R
75
54
59
11
21
11
43
25
D
E
D
There were 93 carved badge. 18 were used up. How many carved badge are left?R
There were 61 bronze key. 36 were used up. How many bronze key are left?N
There were 97 map scroll. 38 were used up. How many map scroll are left?G
Scout Leader found 3 map scroll yesterday and 8 more today. How many map scroll in all?H
Scout Leader found 14 ruby gem yesterday and 40 more today. How many ruby gem in all?I
Scout Leader found 22 bronze key yesterday and 21 more today. How many bronze key in all?A
Scout Leader lined up 3 rows of 7 ruby gem. How many ruby gem in all?T
0/7 letters found
Clue 3
Addition
You add up all the expedition coins found near the temple steps.
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
8720
2060
5286
2167
3749
5964
3254
5286
6993
8494
5456
5876
2167
2060
4190
8494
8979
A
8720
3644
3644
5964
4108
A
8720
5456
8494
6993
2060
4190
8494
9522
5876
2705
2705
5653 + 3067 =A
2578 + 5916 =E
2070 + 1184 =P
1017 + 1150 =N
2967 + 2997 =S
5167 + 4355 =M
1165 + 895 =T
1774 + 2416 =H
2292 + 1816 =C
5400 + 3579 =W
2794 + 2662 =R
2621 + 1128 =Y
2321 + 2965 =I
1562 + 2082 =L
1889 + 3987 =O
1243 + 1462 =F
4491 + 2502 =D
0/17 letters found
Clue 4
Subtraction
You calculate how many ancient tiles are missing from the floor 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.
N
1503
3786
8423
N
1503
5190
5379
5883
3786
5507
7305
1093
8260
3492
7305
4123
5379
3786
4949
1402
8423
N
1503
1402
5507
3786
1402
3786
3078
4556
5379
3786
7887
8423
8423
8260
2019 - 516 =N
7693 - 2186 =H
7669 - 2479 =B
8188 - 4402 =E
7956 - 3007 =F
12475 - 4588 =D
9234 - 811 =O
8769 - 2886 =U
7633 - 3510 =S
4223 - 2821 =T
2037 - 944 =I
6218 - 1662 =P
9137 - 877 =R
4582 - 1504 =M
10581 - 3276 =A
5128 - 1636 =W
10365 - 4986 =L
0/17 letters found
Clue 5
Division facts (1-12) — the last clue
You divide the total path markers equally among your scout team to narrow the search area.
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
121 ÷ 11 = ?
18 ÷ 2 = ?
7 ÷ 1 = ?
132 ÷ 11 = ?
12 ÷ 3 = ?
8 ÷ 4 = ?
16 ÷ 2 = ?
9 ÷ 3 = ?
60 ÷ 10 = ?
40 ÷ 4 = ?
11 ÷ 11 = ?
Step 2 — cross out the sentence with each answer
1.The villain melted the ancient iron lock with a laser torch, then called for wild help with a sonar whistle.
2.The villain scouted the hallway using a radar compass, then zipped away down the cable on a zip line wheel.
3.The villain scouted the hallway using a radar compass, then vanished into the room using smoke pellets.
4.The villain swung across the pit with a grappling hook, then marched up the stone wall in climbing boots.
5.The villain zipped ahead to spy with a pocket drone, then zipped away down the cable on a zip line wheel.
6.The villain unlocked the secret door with a decoder ring, then vanished into the room using smoke pellets.
7.The villain unlocked the secret door with a decoder ring, then zipped away down the cable on a zip line wheel.
8.The villain swung across the pit with a grappling hook, then zipped away down the cable on a zip line wheel.
9.The villain unlocked the secret door with a decoder ring, then called for wild help with a sonar whistle.
10.The villain zipped ahead to spy with a pocket drone, then vanished into the room using smoke pellets.
11.The villain scouted the hallway using a radar compass, then called for wild help with a sonar whistle.
12.The villain scouted the hallway using a radar compass, then marched up the stone wall in climbing boots.
Solve it
Name the culprit
Choose the one suspect left standing.
Answer Key — The Mystery of the Crystal Map
Culprit: Kai (Pocket Drone · Zip Line Wheel · Right Handed · Neon Blue Hair · Fear Of Spiders)
- Clue 1 (Rounding): "THE VILLAIN DOES NOT USE CLIMBING BOOTS"Round 453 to the nearest hundred = 500 (T) · Round 167 to the nearest ten = 170 (D) · Round 47 to the nearest ten = 50 (L) · Round 3,742 to the nearest hundred = 3700 (M) · Round 434 to the nearest ten = 430 (I) · Round 4,303 to the nearest hundred = 4300 (A) · Round 293 to the nearest ten = 290 (H) · Round 233 to the nearest ten = 230 (N) · Round 134 to the nearest ten = 130 (S) · Round 7,217 to the nearest thousand = 7000 (G) · Round 675 to the nearest hundred = 700 (C) · Round 1,325 to the nearest hundred = 1300 (E) · Round 70 to the nearest ten = 70 (V) · Round 3,337 to the nearest thousand = 3000 (B) · Round 254 to the nearest hundred = 300 (O) · Round 1,715 to the nearest hundred = 1700 (U)
- Clue 2 (Word problems): "RIGHT HANDED"There were 93 carved badge. 18 were used up. How many carved badge are left? = 75 (R) · There were 61 bronze key. 36 were used up. How many bronze key are left? = 25 (N) · There were 97 map scroll. 38 were used up. How many map scroll are left? = 59 (G) · Scout Leader found 3 map scroll yesterday and 8 more today. How many map scroll in all? = 11 (H) · Scout Leader found 14 ruby gem yesterday and 40 more today. How many ruby gem in all? = 54 (I) · Scout Leader found 22 bronze key yesterday and 21 more today. How many bronze key in all? = 43 (A) · Scout Leader lined up 3 rows of 7 ruby gem. How many ruby gem in all? = 21 (T)
- Clue 3 (Addition): "A TINY SPIDER ON THE WALL SCARED THEM OFF"5653 + 3067 = 8720 (A) · 2578 + 5916 = 8494 (E) · 2070 + 1184 = 3254 (P) · 1017 + 1150 = 2167 (N) · 2967 + 2997 = 5964 (S) · 5167 + 4355 = 9522 (M) · 1165 + 895 = 2060 (T) · 1774 + 2416 = 4190 (H) · 2292 + 1816 = 4108 (C) · 5400 + 3579 = 8979 (W) · 2794 + 2662 = 5456 (R) · 2621 + 1128 = 3749 (Y) · 2321 + 2965 = 5286 (I) · 1562 + 2082 = 3644 (L) · 1889 + 3987 = 5876 (O) · 1243 + 1462 = 2705 (F) · 4491 + 2502 = 6993 (D)
- Clue 4 (Subtraction): "NEON BLUE HAIR WAS LEFT ON THE TEMPLE DOOR"2019 - 516 = 1503 (N) · 7693 - 2186 = 5507 (H) · 7669 - 2479 = 5190 (B) · 8188 - 4402 = 3786 (E) · 7956 - 3007 = 4949 (F) · 12475 - 4588 = 7887 (D) · 9234 - 811 = 8423 (O) · 8769 - 2886 = 5883 (U) · 7633 - 3510 = 4123 (S) · 4223 - 2821 = 1402 (T) · 2037 - 944 = 1093 (I) · 6218 - 1662 = 4556 (P) · 9137 - 877 = 8260 (R) · 4582 - 1504 = 3078 (M) · 10581 - 3276 = 7305 (A) · 5128 - 1636 = 3492 (W) · 10365 - 4986 = 5379 (L)
- Clue 5 (Division facts (1-12)): surviving statement (box 5) → Kai121 ÷ 11 = 11 · 18 ÷ 2 = 9 · 7 ÷ 1 = 7 · 132 ÷ 11 = 12 · 12 ÷ 3 = 4 · 8 ÷ 4 = 2 · 16 ÷ 2 = 8 · 9 ÷ 3 = 3 · 60 ÷ 10 = 6 · 40 ÷ 4 = 10 · 11 ÷ 11 = 1
About this mystery
- Grade level
- Grade 4 math
- Math topics
- Rounding, Word problems, Addition, Subtraction, Division
- Reading level
- grades 3-4
- Theme
- The Mystery of the Crystal Map — set in Jungle Temple Ruins
- Format
- Interactive online & printable worksheet with answer key
- Solution
- One unique, verified culprit among 21 suspects