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\ 19-Nov-2025 Bharat Arora Proof-9 Reader’s Sign _______________________ Date __________
Fun Activity 21 st
Century #Computational Thinking,
Skills #Experiential Learning
Mathematical Game on Factors and Multiples
This is a game for two players. The first player starts by crossing out an even number
that is less than 50. The second player must cross out a number that is a factor
or multiple of the number just crossed out by the first player. Players continue to
take turns to cross out numbers, at each turn choosing a number that is a factor or
multiple of the number just crossed out by the other player. The first person who is
unable to cross out a number loses. (Use a pencil so you can reuse the grid.)
1 2 3 4 5 6 7 8 9 10
11 12 13 14 15 16 17 18 19 20
21 22 23 24 25 26 27 28 29 30
31 32 33 34 35 36 37 38 39 40
41 42 43 44 45 46 47 48 49 50
51 52 53 54 55 56 57 58 59 60
61 62 63 64 65 66 67 68 69 70
71 72 73 74 75 76 77 78 79 80
81 82 83 84 85 86 87 88 89 90
91 92 93 94 95 96 97 98 99 100
HOTS
21 st
Century #Computational Thinking
Skills
1. Find the least number of stones required so that heaps of 15, 20 or 30 stones can be
made without any stones left over.
2. There are 40 girls and 32 boys who want to participate in the Annual Day Function.
Each team must have the same number of girls and the same number of boys.
a. What is the greatest number of teams that can participate in the function?
b. How many girls and boys will be in each team?
82 Mathematics 5
