Math Mysteries
Grade 4Reading: grades 3-4Fractions of a numberRoundingAdditionSubtraction

The Golden Monkey Mystery

The Golden Monkey Statue has vanished from the jungle temple! A rogue explorer sneaked past the traps and took it. It is up to our Jungle Patrol to track them down using clues left along the muddy path.

Suspects

Possible suspects

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

21 of 21 still in play
NameSpecial GearCamp ToolHands HandednessHair ColorAvoided Trap
Zoe Trackerdecoder ringcanteen toolright handed gripbright red hairbanana peel
Joy Pathgrappling hookmini compassleft handed gripsandy blonde hairbanana peel
Maya Finderlaser flashlightsignal mirrorleft handed gripdusty brown hairbanana peel
Wes Peakdecoder ringsurvival shovelleft handed gripbright red hairquicksand bog
Pam Cavedecoder ringsurvival shovelright handed gripbright red hairbanana peel
Roy Claygrappling hookmultitool axeright handed gripdusty brown hairbanana peel
Tess Fernclimbing bootscanteen toolright handed gripdusty brown hairbanana peel
Leo Explorergrappling hookmultitool axeright handed gripbright red hairbanana peel
Dan Ropedecoder ringsurvival shovelright handed gripdusty brown hairbanana peel
Guy Torchsonar headsetmultitool axeleft handed gripsandy blonde hairnet trap
Amy Mossclimbing bootssurvival shovelright handed gripdusty brown hairnet trap
Rex Digsonar headsetsurvival shovelright handed gripsandy blonde hairbanana peel
Eli Mapsonar headsetmini compassright handed gripdusty brown hairquicksand bog
Max Stonesonar headsetcanteen toolright handed gripdusty brown hairbanana peel
Ned Gearclimbing bootssignal mirrorright handed gripsandy blonde hairnet trap
Ian Bootsgrappling hookmini compassright handed gripdusty brown hairbanana peel
Ivy Vinedecoder ringmini compassleft handed gripbright red hairquicksand bog
Kai Hunterclimbing bootsmini compassleft handed gripbright red hairquicksand bog
Sam Scoutlaser flashlightsignal mirrorleft handed gripsandy blonde hairquicksand bog
Eva Campclimbing bootsmini compassleft handed gripbright red hairnet trap
Ava Trailclimbing bootsmultitool axeleft handed gripdusty brown hairbanana peel
Clue 1

Fractions of a number

The Junior Rangers find a torn journal page. It says only a fraction of the bridge planks are safe to step on. We must calculate the safe steps to cross the river and find 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
9
19
10
23
5
36
36
11
5
12
39
6
10
25
12
6
T
9
19
11
23
10
11
38
33
36
T
9
5
T
9
6
6
36
11
13
10
2/8 of 36 =T
2/8 of 156 =D
1/8 of 96 =N
2/6 of 69 =V
1/10 of 190 =H
3/6 of 76 =M
5/10 of 10 =I
1/6 of 78 =X
2/10 of 55 =A
5/6 of 30 =S
1/8 of 80 =E
3/5 of 10 =O
3/4 of 48 =L
1/4 of 132 =U
0/14 letters found
Clue 2

Rounding

A digital tracker picks up a signal from the rogue explorer. The screen rounds the distance to the nearest ten meters. We need to round the number to locate the next trail sign.

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
90
20
370
9000
70
1300
370
170
200
3700
4300
370
2300
2000
200
50
1100
20
T
90
20
2000
230
300
370
300
1100
200
50
170
Round 94 to the nearest tenT
Round 218 to the nearest hundredR
Round 314 to the nearest hundredD
Round 370 to the nearest tenE
Round 3,658 to the nearest hundredO
Round 20 to the nearest tenH
Round 230 to the nearest tenN
Round 47 to the nearest tenI
Round 1,079 to the nearest hundredG
Round 4,341 to the nearest hundredV
Round 2,279 to the nearest hundredS
Round 172 to the nearest tenP
Round 73 to the nearest tenL
Round 8,520 to the nearest thousandC
Round 1,836 to the nearest thousandA
Round 1,282 to the nearest hundredU
0/16 letters found
Clue 3

Addition

We find a stash of lost supply crates hidden behind some giant ferns. Let us add up all the juice boxes and energy bars to see how far the runner could have traveled.

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
9032
5207
6220
6663
8378
8469
8469
7896
8378
6098
9588
6220
7896
6573
6220
6074
7896
7049
7896
6098
7896
6098
7896
5570
6220
6220
8469
3336 + 5696 =T
4090 + 1984 =D
5442 + 2936 =I
3103 + 3117 =E
5410 + 2486 =A
2873 + 2334 =H
4008 + 4461 =L
4194 + 2379 =R
3580 + 3469 =B
2363 + 3735 =N
3434 + 2136 =P
5112 + 4476 =F
4551 + 2112 =V
0/13 letters found
Clue 4

Subtraction

The team finds footprints leading into a cave, but some footprints got washed away by the heavy rain. Subtract the ruined prints from the total to count how many 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.

T
5849
6771
1751
3160
8254
6758
6218
6758
2650
5736
5700
6771
5736
5580
6468
4337
5580
T
5849
1111
8385
8254
3914
7999
2650
6771
5736
6758
8254
7910 - 2061 =T
7464 - 3550 =O
7778 - 2198 =S
5966 - 1629 =U
3770 - 2019 =E
3172 - 522 =N
10383 - 1998 =B
8424 - 1666 =I
8057 - 2357 =L
6642 - 174 =D
3354 - 2243 =Y
4017 - 857 =C
11676 - 3422 =R
9644 - 1645 =W
8734 - 2998 =A
8265 - 2047 =M
11285 - 4514 =H
0/17 letters found
Clue 5

Fractions of a number — the last clue

A locked stone door blocks the path. The lock requires us to slide a fraction of the heavy crystal keys into the slot. Solve the puzzle to open the door 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
2/10 of 5 = ?
2/5 of 20 = ?
1/10 of 90 = ?
4/6 of 9 = ?
2/10 of 20 = ?
4/8 of 22 = ?
6/8 of 16 = ?
5/6 of 6 = ?
3/6 of 14 = ?
1/10 of 30 = ?
4/6 of 3 = ?
Step 2 — cross out the sentence with each answer
1.The villain crosses the rickety rope bridge, then swipes the golden statue.
2.The villain swings across the canyon, then swipes the golden statue.
3.The villain scrambles up the stone wall, then swipes the golden statue.
4.The villain slides down the muddy slope, then pockets the crystal key.
5.The villain scrambles up the stone wall, then grabs the ruby eyes.
6.The villain slides down the muddy slope, then snatches the ancient scroll.
7.The villain crawls through the secret tunnel, then grabs the ruby eyes.
8.The villain crawls through the secret tunnel, then snatches the ancient scroll.
9.The villain slides down the muddy slope, then swipes the golden statue.
10.The villain swings across the canyon, then pockets the crystal key.
11.The villain crawls through the secret tunnel, then swipes the golden statue.
12.The villain crosses the rickety rope bridge, then pockets the crystal key.
Solve it

Name the culprit

Choose the one suspect left standing.

About this mystery

Grade level
Grade 4 math
Math topics
Fractions of a number, Rounding, Addition, Subtraction
Reading level
grades 3-4
Theme
The Golden Monkey Mystery — set in Temple of the Golden Monkey
Format
Interactive online & printable worksheet with answer key
Solution
One unique, verified culprit among 21 suspects

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