🤖 RobotsGrade 4Reading: grades 1-2RoundingAdditionSubtractionMultiplicationDivision

The Mischievous Metal Mystery

A rogue robot sneaked into the Robo-City Workshop and mixed up all the blueprint files. Chief Inventor Tink needs your help to decode the clues and find the sneaky bot.

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	Primary Tool	Gadget	Wiggling Antenna	Wire Color	Shutdown Trick
Byte	Sonic Screwdriver	Radar Dish	Left Antenna	Glow Green Wires	Soapy Water
Bolt	Magnet Beam	Tire Treads	Right Antenna	Neon Blue Wires	Soapy Water
Copper	Plasma Cutter	Grapple Hook	Left Antenna	Neon Blue Wires	Soapy Water
Nano	Magnet Beam	Solar Wings	Right Antenna	Neon Blue Wires	Magnet Trap
Axel	Laser Welder	Grapple Hook	Left Antenna	Glow Green Wires	Magnet Trap
Radar	Sonic Screwdriver	Grapple Hook	Right Antenna	Neon Blue Wires	Magnet Trap
Gearhead	Sonic Screwdriver	Tire Treads	Right Antenna	Glow Green Wires	Soapy Water
Matrix	Plasma Cutter	Grapple Hook	Left Antenna	Neon Blue Wires	Magnet Trap
Turbo	Sonic Screwdriver	Tire Treads	Right Antenna	Neon Blue Wires	Magnet Trap
Circuit	Magnet Beam	Radar Dish	Left Antenna	Glow Green Wires	Magnet Trap
Rustie	Sonic Screwdriver	Radar Dish	Right Antenna	Bright Yellow Wires	Soapy Water
Gears	Plasma Cutter	Radar Dish	Left Antenna	Glow Green Wires	Giant Sponge
Chip	Magnet Beam	Solar Wings	Right Antenna	Glow Green Wires	Soapy Water
Rivets	Magnet Beam	Grapple Hook	Left Antenna	Glow Green Wires	Soapy Water
Widget	Plasma Cutter	Solar Wings	Left Antenna	Neon Blue Wires	Soapy Water
Beep	Plasma Cutter	Solar Wings	Right Antenna	Neon Blue Wires	Soapy Water
Welder	Magnet Beam	Radar Dish	Right Antenna	Neon Blue Wires	Magnet Trap
Gizmo	Drill Arm	Solar Wings	Right Antenna	Neon Blue Wires	Giant Sponge
Sparky	Sonic Screwdriver	Solar Wings	Right Antenna	Bright Yellow Wires	Magnet Trap
Clinker	Drill Arm	Solar Wings	Right Antenna	Neon Blue Wires	Magnet Trap
Titan	Laser Welder	Hover Boots	Left Antenna	Glow Green Wires	Magnet Trap

Clue 1

Rounding

The workshop scanner rounds the energy readings to the nearest hundred.

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

1700

2000

500

700

3000

290

430

3000

230

1300

500

2300

230

1700

200

2300

500

430

9000

430

1300

430

9000

1300

3000

2300

2000

Round 1,737 to the nearest hundredT

Round 2,366 to the nearest thousandH

Round 9,350 to the nearest thousandR

Round 292 to the nearest tenL

Round 33 to the nearest tenO

Round 428 to the nearest tenA

Round 1,287 to the nearest hundredD

Round 230 to the nearest tenN

Round 734 to the nearest hundredV

Round 2,726 to the nearest thousandI

Round 540 to the nearest hundredE

Round 189 to the nearest hundredU

Round 2,257 to the nearest hundredS

0/13 letters found

Clue 2

Addition

We gather all the loose spare parts on the floor to see what is 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.

6168

7168

4671

5470

3992

6168

9674

4671

9303

9311

5470

9311

3201

3992

3661

7168

6168

9311

9674

6168

4671

9674

9311

6168

5470

3992

6168

7269

7168

3934 + 2234 =T

1202 + 2459 =G

3168 + 6135 =S

1819 + 1382 =R

2817 + 6494 =A

2305 + 2366 =E

1642 + 2350 =I

4163 + 3106 =C

4238 + 5436 =N

3182 + 3986 =H

2944 + 2526 =W

0/11 letters found

Clue 3

Subtraction

We count the remaining batteries after the sneaky robot took some.

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

5988

2306

4929

2306

4929

4152

1407

5988

4152

7530

5427

4929

5035

5988

2306

4929

7237

8489

7530

5988

2306

8064

7237

8064

1737

8415

4929

5988

4152

8064

5427

7971 - 1983 =T

10568 - 3331 =M

8408 - 4256 =R

2238 - 501 =G

6467 - 1040 =P

8704 - 3775 =E

8332 - 3297 =D

4235 - 2828 =O

9363 - 874 =W

10647 - 2583 =A

10906 - 3376 =I

2702 - 396 =H

9698 - 1283 =N

0/13 letters found

Clue 4

Multiplication facts (1-12)

The repair bay has rows of toolboxes packed with equal sets of screws.

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

144

1 × 11 =F

9 × 8 =S

7 × 8 =U

9 × 4 =I

6 × 7 =R

1 × 2 =L

11 × 6 =N

9 × 7 =C

12 × 12 =T

4 × 1 =O

6 × 1 =E

3 × 7 =W

8 × 5 =B

8 × 8 =D

11 × 8 =H

4 × 11 =A

0/16 letters found

Clue 5

Division facts (1-12) — the last clue

We share the shiny gears evenly among the helper bots to fix the door.

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 ÷ 6 = ?

54 ÷ 6 = ?

12 ÷ 1 = ?

6 ÷ 1 = ?

88 ÷ 8 = ?

10 ÷ 1 = ?

12 ÷ 3 = ?

8 ÷ 1 = ?

5 ÷ 1 = ?

18 ÷ 9 = ?

3 ÷ 1 = ?

Step 2 — cross out the sentence with each answer

1.The villain spun a drill arm, then glided on solar wings.

2.The villain cut with a plasma cutter, then glided on solar wings.

3.The villain cut with a plasma cutter, then floated in hover boots.

4.The villain cut with a plasma cutter, then rolled on tire treads.

5.The villain spun a drill arm, then scanned with a radar dish.

6.The villain cut with a plasma cutter, then swung on a grapple hook.

7.The villain waved a sonic screwdriver, then swung on a grapple hook.

8.The villain pulled with a magnet beam, then scanned with a radar dish.

9.The villain pulled with a magnet beam, then glided on solar wings.

10.The villain used a laser welder, then floated in hover boots.

11.The villain pulled with a magnet beam, then rolled on tire treads.

12.The villain waved a sonic screwdriver, then rolled on tire treads.

Solve it

Name the culprit

Choose the one suspect left standing.

Answer Key — The Mischievous Metal Mystery

Culprit: Clinker (Drill Arm · Solar Wings · Right Antenna · Neon Blue Wires · Magnet Trap)

Clue 1 (Rounding): "THE VILLAIN DOES NOT USE A RADAR DISH"
Round 1,737 to the nearest hundred = 1700 (T) · Round 2,366 to the nearest thousand = 2000 (H) · Round 9,350 to the nearest thousand = 9000 (R) · Round 292 to the nearest ten = 290 (L) · Round 33 to the nearest ten = 30 (O) · Round 428 to the nearest ten = 430 (A) · Round 1,287 to the nearest hundred = 1300 (D) · Round 230 to the nearest ten = 230 (N) · Round 734 to the nearest hundred = 700 (V) · Round 2,726 to the nearest thousand = 3000 (I) · Round 540 to the nearest hundred = 500 (E) · Round 189 to the nearest hundred = 200 (U) · Round 2,257 to the nearest hundred = 2300 (S)
Clue 2 (Addition): "THE WITNESS SAW A RIGHT ANTENNA TWITCH"
3934 + 2234 = 6168 (T) · 1202 + 2459 = 3661 (G) · 3168 + 6135 = 9303 (S) · 1819 + 1382 = 3201 (R) · 2817 + 6494 = 9311 (A) · 2305 + 2366 = 4671 (E) · 1642 + 2350 = 3992 (I) · 4163 + 3106 = 7269 (C) · 4238 + 5436 = 9674 (N) · 3182 + 3986 = 7168 (H) · 2944 + 2526 = 5470 (W)
Clue 3 (Subtraction): "THE HERO TRIPPED THEM WITH A MAGNET TRAP"
7971 - 1983 = 5988 (T) · 10568 - 3331 = 7237 (M) · 8408 - 4256 = 4152 (R) · 2238 - 501 = 1737 (G) · 6467 - 1040 = 5427 (P) · 8704 - 3775 = 4929 (E) · 8332 - 3297 = 5035 (D) · 4235 - 2828 = 1407 (O) · 9363 - 874 = 8489 (W) · 10647 - 2583 = 8064 (A) · 10906 - 3376 = 7530 (I) · 2702 - 396 = 2306 (H) · 9698 - 1283 = 8415 (N)
Clue 4 (Multiplication facts (1-12)): "FOUND NEON BLUE WIRES AT THE SCENE"
1 × 11 = 11 (F) · 9 × 8 = 72 (S) · 7 × 8 = 56 (U) · 9 × 4 = 36 (I) · 6 × 7 = 42 (R) · 1 × 2 = 2 (L) · 11 × 6 = 66 (N) · 9 × 7 = 63 (C) · 12 × 12 = 144 (T) · 4 × 1 = 4 (O) · 6 × 1 = 6 (E) · 3 × 7 = 21 (W) · 8 × 5 = 40 (B) · 8 × 8 = 64 (D) · 11 × 8 = 88 (H) · 4 × 11 = 44 (A)
Clue 5 (Division facts (1-12)): surviving statement (box 1) → Clinker
42 ÷ 6 = 7 · 54 ÷ 6 = 9 · 12 ÷ 1 = 12 · 6 ÷ 1 = 6 · 88 ÷ 8 = 11 · 10 ÷ 1 = 10 · 12 ÷ 3 = 4 · 8 ÷ 1 = 8 · 5 ÷ 1 = 5 · 18 ÷ 9 = 2 · 3 ÷ 1 = 3

About this mystery

Grade level: Grade 4 math
Math topics: Rounding, Addition, Subtraction, Multiplication, Division
Reading level: grades 1-2
Theme: The Mischievous Metal Mystery — set in Robo-City Workshop
Format: Interactive online & printable worksheet with answer key
Solution: One unique, verified culprit among 21 suspects

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