Math Crackers
🔎 Roblox dead railsGrade 5Reading: grades 5-6AdditionSubtractionMultiplicationPlace valueFractions of a number

The Dead Rails Derailer

A mysterious hacker has hijacked the Roblox Dead Rails system! They locked the Lead Conductor in a runaway minecart and are scrambling the signals along the tracks. We must decrypt the system, find the clues, and stop the Saboteur before the final crash.

Suspects

Possible suspects

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

21 of 21 still in play
NameMain SabotageGlitch PowerGoggles TypeRoblox HairDefeat Tool
RoboBlipSteam BurstingGravity FlippingWears Light GogglesSpiky Blue HairSuper Bloxi Cola
GlitchHunterCart DerailingBlock SpawningWears Light GogglesBlocky Yellow HairGolden Wrench
SignalManSpeed GlitchingLaser WeldingWears Light GogglesNeon Green HairSuper Bloxi Cola
DominoCrownSpeed GlitchingBlock SpawningWears Heavy VisorBlocky Yellow HairRusty Crowbar
ProCartRiderSignal JammingLaser WeldingWears Heavy VisorBlocky Yellow HairGolden Wrench
CheezburgerTrack SabotageGravity FlippingWears Heavy VisorNeon Green HairRusty Crowbar
NoobKingSteam BurstingBlock SpawningWears Light GogglesNeon Green HairSuper Bloxi Cola
BaconHairProSpeed GlitchingBlock SpawningWears Light GogglesSpiky Blue HairRusty Crowbar
Guest666Signal JammingGravity FlippingWears Light GogglesNeon Green HairSuper Bloxi Cola
SpikeDodgeSpeed GlitchingMagnet PullingWears Light GogglesBlocky Yellow HairRusty Crowbar
BloxxyDevSteam BurstingMagnet PullingWears Heavy VisorBlocky Yellow HairGolden Wrench
SteamViperTrack SabotageBlock SpawningWears Light GogglesNeon Green HairSuper Bloxi Cola
CartCrasherSpeed GlitchingGhost SpeedingWears Light GogglesNeon Green HairSuper Bloxi Cola
PixelCrusherSteam BurstingGhost SpeedingWears Light GogglesNeon Green HairSuper Bloxi Cola
OofMasterSpeed GlitchingLaser WeldingWears Heavy VisorBlocky Yellow HairSuper Bloxi Cola
ValiantValkSteam BurstingMagnet PullingWears Heavy VisorNeon Green HairGolden Wrench
BuildermanSignal JammingLaser WeldingWears Heavy VisorNeon Green HairSuper Bloxi Cola
TelamonTrack SabotageGhost SpeedingWears Light GogglesNeon Green HairRusty Crowbar
ShedletskyTrack SabotageMagnet PullingWears Heavy VisorSpiky Blue HairSuper Bloxi Cola
TixSpenderCart DerailingLaser WeldingWears Light GogglesBlocky Yellow HairSuper Bloxi Cola
TrackRacerTrack SabotageBlock SpawningWears Heavy VisorNeon Green HairGolden Wrench
Clue 1

Addition

We found the switchboard at Station One. The saboteur added extra dummy circuits to overload the power. Add up the active circuits on the grid to reveal our first hidden file.

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
5799
5953
7226
9743
2144
6700
6700
7572
2144
5641
6552
3229
7226
5591
5641
3229
T
5799
5991
5591
7226
7477
6700
3229
8558
9423
5591
8827
7572
8839
5641
2144
5641
4294
3130 + 2669 =T
4945 + 3882 =P
4887 + 2339 =E
3816 + 2175 =U
3082 + 2509 =S
1796 + 3845 =N
6633 + 3110 =V
4656 + 3902 =C
3271 + 3281 =D
1569 + 1660 =O
1646 + 2648 =G
1068 + 1076 =I
4553 + 2147 =L
4882 + 2595 =B
4126 + 5297 =K
4141 + 1812 =H
3049 + 4523 =A
5629 + 3210 =W
0/18 letters found
Clue 2

Subtraction

The cart's fuel cell is leaking rapidly! We need to calculate how much fuel was lost between the two checkpoints. Subtract the current level from the starting amount to unlock the next data node.

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
7163
3442
1483
8463
8970
4482
4482
7139
8970
5974
7369
1483
7139
5971
2198
4482
8970
2314
3442
T
7163
2314
1330
2314
2314
4482
1483
2198
12092 - 4929 =T
5649 - 4166 =E
6375 - 4061 =G
7435 - 66 =W
1462 - 132 =O
8574 - 1435 =A
3753 - 1555 =S
6044 - 2602 =H
10339 - 4368 =R
11450 - 2480 =I
9328 - 3354 =N
8520 - 4038 =L
9893 - 1430 =V
0/13 letters found
Clue 3

Multiplication facts (1-12)

The backup generator is locked behind rows of cargo containers. The layout is a massive grid of stacked boxes. Multiply the number of rows by the boxes in each row to bypass the lock and get the hair 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
120
40
12
42
10
100
100
21
10
108
63
66
49
12
27
50
21
T
120
50
88
15
12
27
44
100
66
18
10
63
66
100
21
12 × 10 =T
10 × 5 =S
8 × 11 =U
6 × 2 =E
10 × 4 =H
10 × 10 =L
1 × 10 =I
9 × 3 =R
9 × 12 =N
4 × 11 =B
2 × 9 =X
7 × 9 =C
3 × 5 =P
7 × 7 =W
11 × 6 =O
7 × 6 =V
3 × 7 =A
0/17 letters found
Clue 4

Place value

A strange signal is blinking on the speed monitor. The numbers are scrambled, and we need to identify the exact digit in the thousands place to decode the frequency. Read the digit carefully to find the tell.

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
800
40
500
N
800
700
900
40
40
N
800
9000
7000
100
900
90
3000
100
70
70
100
N
800
700
6000
400
40
900
40
50
500
4000
N
800
2000
What is the value of the 8 in 15,844?N
What is the value of the 3 in 63,585?L
What is the value of the 4 in 15,147?E
What is the value of the 1 in 657,128?I
What is the value of the 9 in 49,615?H
What is the value of the 4 in 753,406?W
What is the value of the 5 in 230,956?F
What is the value of the 9 in 150,494?C
What is the value of the 7 in 556,795?G
What is the value of the 9 in 51,988?R
What is the value of the 5 in 21,534?O
What is the value of the 4 in 24,113?U
What is the value of the 6 in 346,427?S
What is the value of the 7 in 61,275?P
What is the value of the 7 in 437,558?A
What is the value of the 2 in 52,313?D
0/16 letters found
Clue 5

Fractions of a number — the last clue

The final track switch is jammed. We have a set of light bulbs, but only a fraction of them need to be turned on to reset the mechanism. Calculate the exact fraction of bulbs to light up, and we will reveal the villain's true weakness!

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
1/4 of 24 = ?
2/4 of 22 = ?
1/4 of 8 = ?
8/10 of 10 = ?
2/8 of 16 = ?
4/10 of 25 = ?
2/8 of 4 = ?
1/8 of 40 = ?
6/10 of 15 = ?
3/8 of 32 = ?
2/4 of 6 = ?
Step 2 — cross out the sentence with each answer
1.The villain bends the steel rails out of shape, then welds the emergency brakes shut.
2.The villain releases a massive burst of hot steam, then fades into a ghostly shadow.
3.The villain lifts the minecart clean off the tracks, then pulls metal parts off with magnets.
4.The villain releases a massive burst of hot steam, then turns the gravity upside down.
5.The villain releases a massive burst of hot steam, then spawns giant blocks onto the pathway.
6.The villain injects a speed boosting glitch code, then welds the emergency brakes shut.
7.The villain injects a speed boosting glitch code, then fades into a ghostly shadow.
8.The villain scrambles the railway signal lights, then spawns giant blocks onto the pathway.
9.The villain lifts the minecart clean off the tracks, then spawns giant blocks onto the pathway.
10.The villain scrambles the railway signal lights, then welds the emergency brakes shut.
11.The villain scrambles the railway signal lights, then turns the gravity upside down.
12.The villain scrambles the railway signal lights, then pulls metal parts off with magnets.
Solve it

Name the culprit

Choose the one suspect left standing.

About this mystery

Grade level
Grade 5 math
Math topics
Addition, Subtraction, Multiplication, Place value, Fractions of a number
Reading level
grades 5-6
Theme
The Dead Rails Derailer — set in The Abandoned Roblox Minecart Tracks
Format
Interactive online & printable worksheet with answer key
Solution
One unique, verified culprit among 21 suspects

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