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Mathigon@MathigonOrg
24 Dec 2023
DAY 24 What is the least number of moves needed to transfer all seven disks from the first tower to the last, without placing a larger disk on a smaller one? All puzzles and solutions at mathigon.org/puzzles #Math #Puzzle #MathigonPuzzles
6
13
31
4,248
Mathigon@MathigonOrg
23 Dec 2023
DAY 23 All three circles have radius 1. What is the radius of the larger semicircle? All puzzles and solutions at mathigon.org/puzzles #Math #Puzzle #MathigonPuzzles
7
8
58
8,863
Mathigon@MathigonOrg
22 Dec 2023
DAY 22 What’s the probability that the ball will land in bucket B? All puzzles and solutions at mathigon.org/puzzles #Math #Puzzle #MathigonPuzzles
9
15
86
12,601
Mathigon@MathigonOrg
21 Dec 2023
DAY 21 Can you make all these shapes using the seven Tangram pieces? All puzzles and solutions at mathigon.org/puzzles #Math #Puzzle #MathigonPuzzles
6
16
2,884
Mathigon@MathigonOrg
20 Dec 2023
DAY 20 What is the sum of all the digits of the numbers from 1 to 100? 1 2 3 … (9 9) (1 0 0) All puzzles and solutions at mathigon.org/puzzles #Math #Puzzle #MathigonPuzzles
2
13
30
4,699
Mathigon@MathigonOrg
19 Dec 2023
DAY 19 Use a single, straight-line to cut this shape into two pieces that can be rearranged into a square. All puzzles and solutions at mathigon.org/puzzles #Math #Puzzle #MathigonPuzzles
2
11
33
5,060
Mathigon@MathigonOrg
18 Dec 2023
DAY 18 How many different necklaces can be made using five identical blue beads, and two identical yellow beads? All puzzles and solutions at mathigon.org/puzzles #Math #Puzzle #MathigonPuzzles
3
14
39
4,658
Mathigon@MathigonOrg
17 Dec 2023
DAY 17 You and your friend both throw a fair die. What is the probability that you get a higher number? All puzzles and solutions at mathigon.org/puzzles #Math #Puzzle #MathigonPuzzles
5
12
34
5,973
Mathigon@MathigonOrg
16 Dec 2023
DAY 16 A semicircle is placed inside a square of size 1. What is the diameter d of the semicircle? All puzzles and solutions at mathigon.org/puzzles #Math #Puzzle #MathigonPuzzles
4
8
28
6,085
Mathigon@MathigonOrg
15 Dec 2023
DAY 15 Rearrange these 8 prime numbers and 1 into a magic square where every row and column adds up to the same number. All puzzles and solutions at mathigon.org/puzzles #Math #Puzzle #MathigonPuzzles
4
9
43
5,327
Mathigon@MathigonOrg
14 Dec 2023
DAY 14 How many squares can you make using four of these points as vertices? All puzzles and solutions at mathigon.org/puzzles #Math #Puzzle #MathigonPuzzles
6
13
43
7,530
Mathigon@MathigonOrg
13 Dec 2023
DAY 13 Five people A, B, C, D and E are seated randomly around a round table. What is the probability that A and B are next to each other? All puzzles and solutions at mathigon.org/puzzles #Math #Puzzle #MathigonPuzzles
6
8
37
7,259
Mathigon@MathigonOrg
12 Dec 2023
DAY 12 One cut divides a cake into 2 pieces. Two cuts can divide it into 4 pieces. Three cuts can divide it into 7 pieces. What is the maximum number of pieces you can make with 10 cuts? All puzzles and solutions at mathigon.org/puzzles #Math #Puzzle #MathigonPuzzles
5
7
20
3,876
Mathigon@MathigonOrg
11 Dec 2023
DAY 11 How many of these 15 coins arranged in a triangle do you have to move, so that the triangle points downwards? All puzzles and solutions at mathigon.org/puzzles #Math #Puzzle #MathigonPuzzles
9
19
74
12,848
Mathigon@MathigonOrg
10 Dec 2023
DAY 10 How many numbers between 1 and 9999 consist of at most two different digits? All puzzles and solutions at mathigon.org/puzzles #Math #Puzzle #MathigonPuzzles
2
4
20
2,485
Mathigon@MathigonOrg
9 Dec 2023
DAY 9 Can you cut this right-angled triangle with smaller sides 1 and 2 into five identical triangles, each similar to the big triangle? All puzzles and solutions at mathigon.org/puzzles #Math #Puzzle #MathigonPuzzles
6
10
44
7,233
Mathigon@MathigonOrg
8 Dec 2023
DAY 8 What proportion of this bottle is filled with water? All puzzles and solutions at mathigon.org/puzzles #Math #Puzzle #MathigonPuzzles
8
13
58
9,121
Mathigon@MathigonOrg
7 Dec 2023
DAY 7 Here is a 3 x 4 grid of stamps. How many different ways are there to tear off four stamps (still joined together along their sides)? All puzzles and solutions at mathigon.org/puzzles #Math #Puzzle #MathigonPuzzles
2
10
23
8,068
Mathigon@MathigonOrg
6 Dec 2023
DAY 6 How many squares does the diagonal of a 15 x 27 rectangle pass through? All puzzles and solutions at mathigon.org/puzzles #Math #Puzzle #MathigonPuzzles
6
26
3,377
Mathigon@MathigonOrg
5 Dec 2023
DAY 5 What is the next number in this sequence? All puzzles and solutions at mathigon.org/puzzles #Math #Puzzle #MathigonPuzzles
10
9
35
6,635
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