Page 162 - Ganit Kaushal
P. 162
Activities
Activity 1
Fill the grid below with prime numbers only, so that the product of each row is the number to the right of the
row and the product of each column is the number below the column.
8
105
70
30 70 28
Activity 2
Below are some boxes with four numbers in each box. Within each box try to say how each number is special
compared to the rest. Share with your classmates and find out who else gave the same reasons as you did. Did
anyone give different reasons that may not have occurred to you?
5 7 3 8 27 3 17 27
12 35 11 24 123 31 44 65
Activity 3
2024 is a leap year (as February has 29 days). Leap years occur in years that are multiples of 4, except for those
years that are evenly divisible by 100 but not 400.
(a) From the year you were born till now, which years were leap years?
(b) From the year 2024 till 2099, how many leap years are there?
160
