2.50
Every number that ends in 0 is a multiple of both 5 and 10. Multiples of 5 always end in 0 or 5 and multiples of 10 always end in 0. 0 is the only common last digit
if the number ends on 5 or 0 the number is divisible by 5
If the rules for 2 and 3 work, the number is divisibale by 5.
If the number ends in 5 or 0 the whole number is divisible by 5.
2.50
The divisibility rule for 2 works because the base of our number system, 10, is divisible by 2.
Every number that ends in 0 is a multiple of both 5 and 10. Multiples of 5 always end in 0 or 5 and multiples of 10 always end in 0. 0 is the only common last digit
If the number is whole and ends in zero, it's divisible by 10
If the number ends in 5 or 0 the whole number is divisible by 5.
if the number ends on 5 or 0 the number is divisible by 5
If the rules for 2 and 3 work, the number is divisibale by 5.
By tautology. If it did not work, it would not be a divisibility rule!
If a number ends in 0, it is divisible by 10.
If the number ends in 5 or 0 the whole number is divisible by 5.
all numbers whose last digits are 5 and 0
The special divisibility rule of 17 is "Take the difference of the rest of the digits and the last digit times 5." For instance: 17 1 - 7 * 5 = 1 - 35 = -34 which is divisible by 17.