HCF means highest common factor
LCM means Lowest Common Multiple
the HCF of 8 and 24 is 6
The LCM of 6 and 8 is 24
An even number ends in 2,4,6,8 or 0
Divisibility rule of 2
a number whose last digit is an even number i.e. 2,4,6,8 and 0
124,468,964,28,000,000,000,000
Divisibility rule of 5
Numbers, which last with the digits,0 or 5
520,2,365.
Divisibility rule of 10
Any number whose last digit is 0.
590,333,330
Divisibility rule of 3
If the sum of its digits is divisible by 3
Divisibility rule of 9
If the sum of its digits is divisible by 9
Of you multiply a number by 10 you move that number to the left once
if you multiply a number by 100 you move it to the left twice