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Think about the step size and number of students who participated. Is there any connection
between them?

Here, step size 2 doesn’t form a star with 8 persons. So, numbers (2, 8) are not a pair of co-prime.
But, step size 3 forms a star with 8 persons. So, numbers (3, 8) is a pair of co-prime.

Stand students in different groups and take several step sizes to explore co-primes.

Think and Answer

On a circle, ten pegs are placed at
equal distance, and numbered as 1 to 10. Pegs are
attached with a string as shown below. Find the
string gap and check whether the string gap and
pegs connected are co-primes.

maths fun
Prime Board Game
To play this game you need to have 8-faced die with numbers 2 to 9 written on it and a game board. The
students will be divided into groups of 4.

Method: Throw the die as you do in a ludo game. If the die faces up with a prime number, then you can
move ahead. If it faces up with a composite number, the turn will automatically get passed over to the next
student. Keep in mind the prime number below 10. Reaching 97 will make the individual a winner.

72 71 70 69 59 58 57 56
73 68 60 55
74 75 67 61 53 54
76 66 62 52
80 79 78 77 65 64 63 51 50 49 48 47
81 46
82 83 84 85 86 87 88 89 41 42 43 44 45
90 40
FiniSh 97 96 95 94 93 92 91 39 38 37 36 35
34
1 2 3 15 16 17 29 30 31 32 33
START 4 14 18 28
6 5 13 19 27 26
7 12 20 25
8 9 10 11 21 22 23 24

159 Prime Time