🔎 Math donutsGrade 4Reading: grades 3-4RoundingAdditionSubtractionMultiplicationDivision
The Great Decimal Donut Heist
Someone has stolen the Golden Ratio Donut from the high-security display case at the Decimal Donut Bakery! It is the most perfect donut ever fried. Master Baker Sprinkle needs your help. The suspects are all baking math students who were visiting the kitchen. Follow the crumbs to find the culprit!
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 | Baking Skill | Baking Tool | Stirring Hand | Hair Style | Baking Fear |
|---|---|---|---|---|---|
| Freddy Fraction | Frosting Magic | Dough Roller | Left-handed stirring | Pink icing hair | Burnt crust fear |
| Alan Turing | Yeast Raising | Dough Roller | Left-handed stirring | Brown cocoa hair | Salty dough fear |
| Chef Pierre | Sugar Dusting | Pastry Bag | Left-handed stirring | Brown cocoa hair | Salty dough fear |
| Katherine Johnson | Frosting Magic | Dough Roller | Left-handed stirring | Pink icing hair | Lemon glaze fear |
| Peter Pi | Yeast Raising | Pastry Bag | Right-handed stirring | Brown cocoa hair | Salty dough fear |
| Sally Sprinkle | Dough Kneading | Pastry Bag | Right-handed stirring | Blue sugar hair | Lemon glaze fear |
| Carl Gauss | Sugar Dusting | Pastry Bag | Right-handed stirring | Brown cocoa hair | Salty dough fear |
| Pythagoras | Sugar Dusting | Dough Roller | Right-handed stirring | Pink icing hair | Lemon glaze fear |
| Tommy Tangent | Glaze Mixing | Sprinkle Cannon | Left-handed stirring | Brown cocoa hair | Lemon glaze fear |
| Rachel Ratio | Dough Kneading | Pastry Bag | Left-handed stirring | Pink icing hair | Salty dough fear |
| Grace Hopper | Yeast Raising | Jelly Injector | Left-handed stirring | Brown cocoa hair | Burnt crust fear |
| Betty Crocker | Frosting Magic | Sprinkle Cannon | Left-handed stirring | Brown cocoa hair | Salty dough fear |
| Ada Lovelace | Glaze Mixing | Pastry Bag | Left-handed stirring | Brown cocoa hair | Lemon glaze fear |
| Albert Einstein | Dough Kneading | Dough Roller | Right-handed stirring | Pink icing hair | Salty dough fear |
| Molly Math | Dough Kneading | Jelly Injector | Left-handed stirring | Brown cocoa hair | Salty dough fear |
| Baker Bob | Sugar Dusting | Golden Whisk | Left-handed stirring | Brown cocoa hair | Salty dough fear |
| Isaac Newton | Dough Kneading | Golden Whisk | Left-handed stirring | Brown cocoa hair | Burnt crust fear |
| Euclid | Sugar Dusting | Dough Roller | Left-handed stirring | Blue sugar hair | Lemon glaze fear |
| Danny Donut | Dough Kneading | Golden Whisk | Right-handed stirring | Brown cocoa hair | Burnt crust fear |
| Gary Geometry | Dough Kneading | Dough Roller | Left-handed stirring | Pink icing hair | Lemon glaze fear |
| Penny Percent | Glaze Mixing | Dough Roller | Right-handed stirring | Brown cocoa hair | Lemon glaze fear |
Clue 1
Rounding
The kitchen scale is broken and only shows rounded weights to the nearest ten. We need to round the flour bags to get 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
2000
5000
290
T
2000
5000
4300
290
110
7000
70
290
1700
50
70
T
2000
70
3700
50
20
2900
70
200
7000
290
50
3700
5000
4300
1700
300
Round 1,858 to the nearest thousandT
Round 4,253 to the nearest hundredI
Round 179 to the nearest hundredL
Round 108 to the nearest tenF
Round 303 to the nearest hundredK
Round 2,930 to the nearest hundredG
Round 18 to the nearest tenA
Round 3,667 to the nearest hundredW
Round 289 to the nearest tenE
Round 6,648 to the nearest thousandD
Round 5,460 to the nearest thousandH
Round 69 to the nearest tenO
Round 50 to the nearest tenN
Round 1,676 to the nearest hundredS
0/14 letters found
Clue 2
Addition
We found several boxes of stolen sprinkles. Let's add them up to find how many are missing and unlock the second 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
4783
8984
2771
5965
8997
5965
6364
2771
8096
T
4783
5965
T
4783
3287
4205
4205
2771
9684
8096
6281
8096
6281
2936
2867
3287
T
4783
8984
2936
2753
2771
5742
T
4783
8984
2936
8808
9684
2338 + 2445 =T
3875 + 2090 =S
1602 + 1169 =E
1921 + 832 =L
5955 + 3729 =D
2977 + 3304 =O
1333 + 1603 =A
3240 + 5568 =N
4652 + 3444 =C
4310 + 4674 =H
1111 + 2176 =I
3409 + 2955 =P
1952 + 2253 =R
2940 + 6057 =U
2904 + 2838 =F
1884 + 983 =W
0/16 letters found
Clue 3
Subtraction
The pastry chef had a giant bowl of glaze, but some was scooped out. Subtract the leftovers to get the third 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
6256
6245
2071
1954
7721
3989
1954
7721
6953
2071
8806
8806
8075
3560
5057
5604
8806
4113
1840
5057
7721
8493
T
6256
2695
3989
4113
8075
4075
6245
9953 - 3697 =T
6421 - 817 =F
5453 - 2758 =Y
9626 - 3381 =H
13673 - 4867 =R
5785 - 728 =S
5433 - 3593 =M
10948 - 3995 =K
11537 - 3816 =A
11494 - 3001 =L
8586 - 511 =U
8375 - 4262 =O
6704 - 2715 =D
3589 - 29 =N
7366 - 3291 =G
2693 - 739 =B
5082 - 3011 =E
0/17 letters found
Clue 4
Multiplication facts (1-12)
The baking trays are arranged in perfect rows and columns. Multiply the donuts on the trays to unlock the fourth 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.
B
55
28
2
90
132
48
2
48
2
81
10
2
90
36
121
28
36
28
110
22
15
121
36
2
132
15
2
15
1
121
22
24
2
2
28
5 × 11 =B
6 × 8 =C
7 × 4 =R
1 × 10 =P
2 × 11 =F
1 × 1 =H
9 × 9 =A
11 × 11 =E
9 × 10 =W
3 × 12 =D
2 × 1 =O
12 × 11 =N
3 × 5 =T
8 × 3 =L
11 × 10 =I
0/15 letters found
Clue 5
Division facts (1-12) — the last clue
A box of jelly donuts must be shared equally among the detective team. Divide them up to find 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
4 ÷ 2 = ?
14 ÷ 2 = ?
120 ÷ 12 = ?
30 ÷ 5 = ?
5 ÷ 5 = ?
144 ÷ 12 = ?
8 ÷ 2 = ?
25 ÷ 5 = ?
18 ÷ 2 = ?
36 ÷ 12 = ?
80 ÷ 10 = ?
Step 2 — cross out the sentence with each answer
1.The villain sprays bright frosting on the walls, then rolls dough flat on the floor.
2.The villain kneads the heavy donut dough, then injects jelly into the lockers.
3.The villain dusts sugar all over the kitchen, then injects jelly into the lockers.
4.The villain mixes a messy batch of glaze, then blasts sprinkles everywhere.
5.The villain dusts sugar all over the kitchen, then rolls dough flat on the floor.
6.The villain mixes a messy batch of glaze, then rolls dough flat on the floor.
7.The villain makes the yeast rise super fast, then rolls dough flat on the floor.
8.The villain kneads the heavy donut dough, then blasts sprinkles everywhere.
9.The villain dusts sugar all over the kitchen, then blasts sprinkles everywhere.
10.The villain sprays bright frosting on the walls, then blasts sprinkles everywhere.
11.The villain dusts sugar all over the kitchen, then squeezes a sticky pastry bag.
12.The villain sprays bright frosting on the walls, then twirls a heavy whisk.
Solve it
Name the culprit
Choose the one suspect left standing.
Answer Key — The Great Decimal Donut Heist
Culprit: Chef Pierre (Sugar Dusting · Pastry Bag · Left-handed stirring · Brown cocoa hair · Salty dough fear)
- Clue 1 (Rounding): "THE THIEF DOES NOT OWN A GOLDEN WHISK"Round 1,858 to the nearest thousand = 2000 (T) · Round 4,253 to the nearest hundred = 4300 (I) · Round 179 to the nearest hundred = 200 (L) · Round 108 to the nearest ten = 110 (F) · Round 303 to the nearest hundred = 300 (K) · Round 2,930 to the nearest hundred = 2900 (G) · Round 18 to the nearest ten = 20 (A) · Round 3,667 to the nearest hundred = 3700 (W) · Round 289 to the nearest ten = 290 (E) · Round 6,648 to the nearest thousand = 7000 (D) · Round 5,460 to the nearest thousand = 5000 (H) · Round 69 to the nearest ten = 70 (O) · Round 50 to the nearest ten = 50 (N) · Round 1,676 to the nearest hundred = 1700 (S)
- Clue 2 (Addition): "THE SUSPECT STIRRED COCOA WITH A LEFT HAND"2338 + 2445 = 4783 (T) · 3875 + 2090 = 5965 (S) · 1602 + 1169 = 2771 (E) · 1921 + 832 = 2753 (L) · 5955 + 3729 = 9684 (D) · 2977 + 3304 = 6281 (O) · 1333 + 1603 = 2936 (A) · 3240 + 5568 = 8808 (N) · 4652 + 3444 = 8096 (C) · 4310 + 4674 = 8984 (H) · 1111 + 2176 = 3287 (I) · 3409 + 2955 = 6364 (P) · 1952 + 2253 = 4205 (R) · 2940 + 6057 = 8997 (U) · 2904 + 2838 = 5742 (F) · 1884 + 983 = 2867 (W)
- Clue 3 (Subtraction): "THE BAD BAKER RUNS FROM SALTY DOUGH"9953 - 3697 = 6256 (T) · 6421 - 817 = 5604 (F) · 5453 - 2758 = 2695 (Y) · 9626 - 3381 = 6245 (H) · 13673 - 4867 = 8806 (R) · 5785 - 728 = 5057 (S) · 5433 - 3593 = 1840 (M) · 10948 - 3995 = 6953 (K) · 11537 - 3816 = 7721 (A) · 11494 - 3001 = 8493 (L) · 8586 - 511 = 8075 (U) · 8375 - 4262 = 4113 (O) · 6704 - 2715 = 3989 (D) · 3589 - 29 = 3560 (N) · 7366 - 3291 = 4075 (G) · 2693 - 739 = 1954 (B) · 5082 - 3011 = 2071 (E)
- Clue 4 (Multiplication facts (1-12)): "BROWN COCOA POWDER DRIFTED ONTO THE FLOOR"5 × 11 = 55 (B) · 6 × 8 = 48 (C) · 7 × 4 = 28 (R) · 1 × 10 = 10 (P) · 2 × 11 = 22 (F) · 1 × 1 = 1 (H) · 9 × 9 = 81 (A) · 11 × 11 = 121 (E) · 9 × 10 = 90 (W) · 3 × 12 = 36 (D) · 2 × 1 = 2 (O) · 12 × 11 = 132 (N) · 3 × 5 = 15 (T) · 8 × 3 = 24 (L) · 11 × 10 = 110 (I)
- Clue 5 (Division facts (1-12)): surviving statement (box 11) → Chef Pierre4 ÷ 2 = 2 · 14 ÷ 2 = 7 · 120 ÷ 12 = 10 · 30 ÷ 5 = 6 · 5 ÷ 5 = 1 · 144 ÷ 12 = 12 · 8 ÷ 2 = 4 · 25 ÷ 5 = 5 · 18 ÷ 2 = 9 · 36 ÷ 12 = 3 · 80 ÷ 10 = 8
About this mystery
- Grade level
- Grade 4 math
- Math topics
- Rounding, Addition, Subtraction, Multiplication, Division
- Reading level
- grades 3-4
- Theme
- The Great Decimal Donut Heist — set in The Great Decimal Donut Bakery
- Format
- Interactive online & printable worksheet with answer key
- Solution
- One unique, verified culprit among 21 suspects