Page 46 - Math Skill - 5

44 Maths

Divisible by Rules Examples

2 If the last digit of any number is 0, 2, 4, 6 50, 52, 44, 36, 168 are divisible by 2.
and 8, then that number is divisible by 2.

3 If the sum of digits of any number 381 (3 + 8 + 1 = 12 and 12 ÷ 3 = 4), So,
is divisible by 3, then that number is 381 is divisible by 3.
divisible by 3.

4 If the last two digits of the given number 23,57,924: the last two digit is 24,
is divisible by 4, then the number is which is divisible by 4. So, 23,57,924
divisible by 4. is divisible by 4.

5 If the last digit of the given number is 0 or 23,57,925: is divisible by 5 as its last
5, then the number is divisible by 5. digit is 5.
6 If the given number is divisible by both 2 21,57,924 is divisible by 6, because

and 3, it is divisible by 6. its last digit is 4, divisible by 2 and
(2 + 1 + 5 + 7 + 9 + 2 + 4) = 30 ÷ 3 = 10,
divisible by 3.

7 To find whether a number is divisible 161: double the last digit 1 as
by 7, take the last digit and double it, 2 × 1 = 2 and 16 – 2 = 14 divisible
subtract it from rest of the number, if the by 7.
difference is divisible by 7 (including 0),
then the original number is divisible by 7.

8 If the last three digits of a number is 2448: Here, the last 3-digit is
divisible by 8, then the number is divisible 448 ÷ 8 = 56, so 2448 is divisible by 8.
by 8.

9 If the sum of digits is divisible by 9, then 52,866: (5 + 2 + 8 + 6 + 6) = 27, divisible
the number is divisible by 9. by 9.
10 If the number ends with 0, it is divisible 4670: Divisible by 10.
by 10.

11 If the difference of sum of digit at odd 6,45,634 [(4 + 6 + 4) – (3 + 5 + 6)]
places and sum of digits at even places of = 14 – 14 = 0. So, 6,45,634 is divisible

the given number is 0 or divisible by 11, by 11.
then the number is divisible by 11.

Fact-o-meter

Always consider the first place
from the right as an odd place.