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E:\Working\Focus_Learning\Math_Genius_5_(05-10-2023)\Open_Files\CHAP_03
\\February 16, 2024 2:20 PM Surender Prajapati Proof 5 Reader _________________________ Date: ___________________74

Practice time 3c

1. Check the divisibility of the given numbers and put a tick () if the number is
divisible and put a cross () if the number is not divisible by the given number.
divisible by
Number
2 3 4 5 6 9 10

(a) 1359

(b) 1605
(c) 3420
(d) 6543

(e) 5004

(f) 7625
(g) 4790
(h) 5423

(i) 9963
(j) 6739

(k) 8400

2. Check if the following numbers are divisible by 11 or not.
(a) 28316 (b) 84535 (c) 19026

Prime and comPosite numBers

The number of factors of a number decides whether it is a prime or a composite. Let us
list the factors of numbers 1 to 10.

Number Factors Number of factors

1 1 1
2 1, 2 2

3 1, 3 2
4 1, 2, 4 3

5 1, 5 2
6 1, 2, 3, 6 4

7 1, 7 2
8 1, 2, 4, 8 4

9 1, 3, 9 3
10 1, 2, 5, 10 4
We can observe from the table:

64 Mathematics-5