Question

Using divisibility tests, determine which of the following
numbers are divisible by 4; by 8:
a)572
b)726352
c)5500
d)6000
e)12159

Answer 1

a)572 is divisible by 4 and 8

b)726352 is divisible by 4 and 8

c)5500 is divisible by 4

d)6000 is divisible by 4 and 8

e)12159 is divisible by none of them..

DIVISIBILITY RULE OF 4 IS The basic rule for divisibility by 4 is that if the number formed by the last two digits in a number is divisible by 4, the original number is divisible by 4; this is because 100 is divisible by 4 and so adding hundreds, thousands, etc. is simply adding another number that is divisible by 4.

DIVISIBILITY RULE OF 8 IS The Rule for 8: If the last three digits of a whole number are divisible by 8, then the entire number is divisible by 8.