Grade 4Reading: grades 3-4RoundingAdditionSubtractionMultiplicationDivision

The Case of the Missing Sun Stone

Someone snuck into the Lost Temple of Cobras and stole the golden Sun Stone! Detective Maya needs your help to crack the clues and find the sneaky raider.

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	Tool	Disguise	Habit	Hairstyle	Fear
Scout Scott	Brass Compass	Golden Mask	Hums Tunes	Braided Hair	Afraid Of Bats
Rover Ruby	Grappling Hook	Mud Camo	Hums Tunes	Spiky Hair	Afraid Of Bats
Ranger Rita	Grappling Hook	Golden Mask	Hums Tunes	Spiky Hair	Afraid Of Snakes
Scout Ben	Brass Compass	Golden Mask	Taps Boots	Spiky Hair	Afraid Of Bats
Rover Rex	Decoder Ring	Mud Camo	Taps Boots	Curly Hair	Afraid Of Snakes
Caver Cora	Brass Compass	Vine Cloak	Taps Boots	Spiky Hair	Afraid Of Snakes
Pioneer Pam	Brass Compass	Night Goggles	Hums Tunes	Braided Hair	Afraid Of Bats
Captain Clara	Decoder Ring	Safari Hat	Taps Boots	Spiky Hair	Afraid Of Bats
Sailor Sue	Decoder Ring	Safari Hat	Taps Boots	Curly Hair	Afraid Of Snakes
Sailor Sam	Grappling Hook	Safari Hat	Taps Boots	Spiky Hair	Afraid Of Snakes
Tracker Tim	Heavy Machete	Vine Cloak	Taps Boots	Curly Hair	Afraid Of Heights
Daring Dan	Brass Compass	Mud Camo	Taps Boots	Spiky Hair	Afraid Of Snakes
Hiker Holly	Brass Compass	Safari Hat	Taps Boots	Spiky Hair	Afraid Of Snakes
Hiker Leo	Smoke Bomb	Safari Hat	Hums Tunes	Spiky Hair	Afraid Of Heights
Pioneer Pete	Heavy Machete	Golden Mask	Taps Boots	Spiky Hair	Afraid Of Snakes
Explorer Eva	Grappling Hook	Safari Hat	Taps Boots	Braided Hair	Afraid Of Snakes
Jungle Jane	Heavy Machete	Safari Hat	Taps Boots	Spiky Hair	Afraid Of Bats
Caver Cal	Smoke Bomb	Golden Mask	Taps Boots	Spiky Hair	Afraid Of Bats
Tracker Tess	Smoke Bomb	Night Goggles	Taps Boots	Curly Hair	Afraid Of Bats
Ranger Rick	Heavy Machete	Night Goggles	Hums Tunes	Curly Hair	Afraid Of Snakes
Fisher Finn	Grappling Hook	Vine Cloak	Hums Tunes	Spiky Hair	Afraid Of Bats

Clue 1

Rounding

Detective Maya checked the digital altimeter, but the screen only showed rounded numbers.

Solve each problem to learn its letter. Then write that letter in every box that shows the same number, and read the secret clue.

290

4300

2900

170

5000

1700

170

130

370

2900

9000

130

290

110

2900

1700

3000

1700

170

130

2900

7000

5000

1700

1300

Round 290 to the nearest tenT

Round 2,874 to the nearest hundredE

Round 1,672 to the nearest hundredA

Round 168 to the nearest tenI

Round 1,344 to the nearest hundredK

Round 8,689 to the nearest thousandS

Round 48 to the nearest tenO

Round 107 to the nearest tenW

Round 7,199 to the nearest thousandC

Round 2,798 to the nearest thousandR

Round 5,333 to the nearest thousandL

Round 369 to the nearest tenD

Round 4,306 to the nearest hundredH

Round 87 to the nearest tenV

Round 134 to the nearest tenN

0/15 letters found

Clue 2

Addition

Maya gathered up all the abandoned supply crates and added them together.

Solve each problem to learn its letter. Then write that letter in every box that shows the same number, and read the secret clue.

6173

4816

5017

4668

3849

4668

3131

5017

8396

6173

3570

3131

4668

6173

4816

5017

6214

3163

9719

9495

6173

4668

9495

6301

4668

6173

9495

6301

5017

4668

2734 + 3439 =T

2161 + 4053 =I

1995 + 1136 =P

2162 + 1687 =U

4938 + 3458 =C

4108 + 5387 =O

2403 + 2265 =S

1043 + 2120 =R

4588 + 5131 =B

3487 + 2814 =N

2461 + 1109 =A

2311 + 2706 =E

3290 + 1526 =H

0/13 letters found

Clue 3

Subtraction

Maya counted the footprint trails and subtracted the false paths.

Solve each problem to learn its letter. Then write that letter in every box that shows the same number, and read the secret clue.

4054

6692

6367

7752

6982

7752

8533

6367

1930

4054

8253

6982

1782

7752

7065

8253

6369

5201

6692

5860

7752

5860

1782

3110

7752

1782

3670

5105

6367

7752

6224 - 2170 =T

8310 - 2450 =I

10295 - 3313 =U

5679 - 2569 =G

8776 - 2409 =E

10157 - 3465 =H

9893 - 1360 =P

11561 - 3809 =S

11492 - 3239 =R

5032 - 3102 =C

7013 - 644 =O

10169 - 3104 =F

6898 - 3228 =A

3885 - 2103 =N

9203 - 4002 =M

9332 - 4227 =K

0/16 letters found

Clue 4

Multiplication facts (1-12)

Maya saw rows of ancient stone tiles and multiplied them to count 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.

100

8 × 4 =A

9 × 11 =R

4 × 12 =I

11 × 6 =N

1 × 5 =D

7 × 9 =K

3 × 11 =B

1 × 9 =E

10 × 10 =H

5 × 10 =Y

1 × 7 =T

5 × 3 =F

12 × 1 =S

2 × 5 =W

3 × 7 =P

1 × 1 =L

0/16 letters found

Clue 5

Division facts (1-12) — the last clue

Maya split the gathered clues into equal piles for her scout team to study.

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

42 ÷ 7 = ?

120 ÷ 10 = ?

110 ÷ 10 = ?

8 ÷ 1 = ?

5 ÷ 5 = ?

24 ÷ 8 = ?

36 ÷ 4 = ?

15 ÷ 3 = ?

20 ÷ 10 = ?

120 ÷ 12 = ?

70 ÷ 10 = ?

Step 2 — cross out the sentence with each answer

1.The villain swung a heavy machete, then smeared on thick mud camo.

2.The villain swung in on a grappling hook, then wrapped up in a vine cloak.

3.The villain swung in on a grappling hook, then smeared on thick mud camo.

4.The villain swung in on a grappling hook, then put on a tall safari hat.

5.The villain swung a heavy machete, then wrapped up in a vine cloak.

6.The villain swung a heavy machete, then donned a shiny golden mask.

7.The villain threw down a thick smoke bomb, then wrapped up in a vine cloak.

8.The villain used a secret decoder ring, then put on a tall safari hat.

9.The villain swung a heavy machete, then pulled down green night goggles.

10.The villain threw down a thick smoke bomb, then pulled down green night goggles.

11.The villain checked a brass compass, then put on a tall safari hat.

12.The villain checked a brass compass, then smeared on thick mud camo.

Solve it

Name the culprit

Choose the one suspect left standing.

Answer Key — The Case of the Missing Sun Stone

Culprit: Sailor Sam (Grappling Hook · Safari Hat · Taps Boots · Spiky Hair · Afraid Of Snakes)

Clue 1 (Rounding): "THE VILLAIN DOES NOT WEAR A VINE CLOAK"
Round 290 to the nearest ten = 290 (T) · Round 2,874 to the nearest hundred = 2900 (E) · Round 1,672 to the nearest hundred = 1700 (A) · Round 168 to the nearest ten = 170 (I) · Round 1,344 to the nearest hundred = 1300 (K) · Round 8,689 to the nearest thousand = 9000 (S) · Round 48 to the nearest ten = 50 (O) · Round 107 to the nearest ten = 110 (W) · Round 7,199 to the nearest thousand = 7000 (C) · Round 2,798 to the nearest thousand = 3000 (R) · Round 5,333 to the nearest thousand = 5000 (L) · Round 369 to the nearest ten = 370 (D) · Round 4,306 to the nearest hundred = 4300 (H) · Round 87 to the nearest ten = 90 (V) · Round 134 to the nearest ten = 130 (N)
Clue 2 (Addition): "THE SUSPECT TAPS THEIR BOOTS ON STONES"
2734 + 3439 = 6173 (T) · 2161 + 4053 = 6214 (I) · 1995 + 1136 = 3131 (P) · 2162 + 1687 = 3849 (U) · 4938 + 3458 = 8396 (C) · 4108 + 5387 = 9495 (O) · 2403 + 2265 = 4668 (S) · 1043 + 2120 = 3163 (R) · 4588 + 5131 = 9719 (B) · 3487 + 2814 = 6301 (N) · 2461 + 1109 = 3570 (A) · 2311 + 2706 = 5017 (E) · 3290 + 1526 = 4816 (H)
Clue 3 (Subtraction): "THE SUSPECT RUNS FROM HISSING SNAKES"
6224 - 2170 = 4054 (T) · 8310 - 2450 = 5860 (I) · 10295 - 3313 = 6982 (U) · 5679 - 2569 = 3110 (G) · 8776 - 2409 = 6367 (E) · 10157 - 3465 = 6692 (H) · 9893 - 1360 = 8533 (P) · 11561 - 3809 = 7752 (S) · 11492 - 3239 = 8253 (R) · 5032 - 3102 = 1930 (C) · 7013 - 644 = 6369 (O) · 10169 - 3104 = 7065 (F) · 6898 - 3228 = 3670 (A) · 3885 - 2103 = 1782 (N) · 9203 - 4002 = 5201 (M) · 9332 - 4227 = 5105 (K)
Clue 4 (Multiplication facts (1-12)): "A FEW SPIKY HAIRS WERE LEFT BEHIND"
8 × 4 = 32 (A) · 9 × 11 = 99 (R) · 4 × 12 = 48 (I) · 11 × 6 = 66 (N) · 1 × 5 = 5 (D) · 7 × 9 = 63 (K) · 3 × 11 = 33 (B) · 1 × 9 = 9 (E) · 10 × 10 = 100 (H) · 5 × 10 = 50 (Y) · 1 × 7 = 7 (T) · 5 × 3 = 15 (F) · 12 × 1 = 12 (S) · 2 × 5 = 10 (W) · 3 × 7 = 21 (P) · 1 × 1 = 1 (L)
Clue 5 (Division facts (1-12)): surviving statement (box 4) → Sailor Sam
42 ÷ 7 = 6 · 120 ÷ 10 = 12 · 110 ÷ 10 = 11 · 8 ÷ 1 = 8 · 5 ÷ 5 = 1 · 24 ÷ 8 = 3 · 36 ÷ 4 = 9 · 15 ÷ 3 = 5 · 20 ÷ 10 = 2 · 120 ÷ 12 = 10 · 70 ÷ 10 = 7

About this mystery

Grade level: Grade 4 math
Math topics: Rounding, Addition, Subtraction, Multiplication, Division
Reading level: grades 3-4
Theme: The Case of the Missing Sun Stone — set in The Lost Temple of Cobras
Format: Interactive online & printable worksheet with answer key
Solution: One unique, verified culprit among 21 suspects

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