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2. Using the divisibility rules, check whether the following numbers are divisible by 2,
3, 4, 5, 9 or 10. Write ‘yes’ if the number is divisible and ‘No’, if it is not divisible.

divisible by
Numbers 2 3 4 5 9 10
(a) 62
(b) 96

(c) 284
(d) 251
(e) 1024
(f) 6318

maths fun
A balloon seller has three bunches of balloons. there is a number written
on each balloon. Colour the balloon as per the code given.

If the number is divisible by 2905 330 3240
Š 2 only — Colour green 405 3438 1738
1430 635 3225 1306 882 1965
Š 5 only — Colour yellow 565 480 3080

Š all 2, 5 and 10 — Colour red 2270 1116 1940 1914 295 3894
Now, answer the following: Bunch A Bunch B Bunch C
1. Which bunch has maximum yellow colour balloons?

2. Balloons of which colour are more in number, green or red?

PriMe NUMBers aND coMPosite NUMBers

Let us find out the factors of numbers from 1 to 10.

Numbers 1 2 3 4 5 6 7 8 9 10

Factors 1 1, 2 1, 3 1, 2, 4 1, 5 1, 2, 3, 6 1, 7 1, 2, 4, 8 1, 3, 9 1, 2, 5, 10

Number of factors 1 2 2 3 2 4 2 4 3 4

Here, we can observe that

Š Number 1 has only 1 factor, which is itself.

Š Numbers 2, 3, 5 and 7 have exactly two factors, that is, 1 and the number itself.
These numbers are called prime numbers.
Note
Numbers which have exactly two factors, 1 and 1 is the only number which
the number itself are called prime numbers. is neither a prime nor a
composite number.
Š Whereas the numbers 4, 6, 8, 9 and 10 have more than
two factors. These numbers are called composite numbers.

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